{"id":3202,"date":"2026-06-23T09:42:35","date_gmt":"2026-06-23T09:42:35","guid":{"rendered":"https:\/\/greenfleets.org\/blog\/?p=3202"},"modified":"2026-06-23T09:46:28","modified_gmt":"2026-06-23T09:46:28","slug":"how-long-does-weed-stay-detectable-in-urine-a-simple-calculator-method","status":"publish","type":"post","link":"https:\/\/greenfleets.org\/blog\/how-long-does-weed-stay-urine\/","title":{"rendered":"How Long Does Weed Stay Detectable in Urine? A Simple Calculator Method"},"content":{"rendered":"<p><!-- obsidian --><\/p>\n<p>Trying to figure out how long does weed stay in urine is a common question, but the answer is not the same for everyone. No simple calculator can predict the exact day a person\u2019s urine test will turn negative.<\/p>\n<p>Still, science can help us make a reasonable estimate. Research shows that the urine detection window for cannabis depends on several key factors, including how often someone uses it, how much they use, the strength of the cannabis, how long they have been using, whether they smoke, vape, or eat it, their body fat and activity level, and how sensitive the urine test is.<\/p>\n<p>This article uses findings from published studies to build a simple estimation method. It is designed for general learning and rough planning only, not for legal, medical, workplace, or court-related decisions.<\/p>\n<main>\r\n      <div id=\"weed-urine-calculator\"><\/div>\r\n    <\/main>\r\n\r\n\r\n<script>\r\n\t(function () {\r\n  \"use strict\";\r\n\r\n  const FACTORS = {\r\n    strength: [\r\n      { value: 0.08, label: \"Low flower, about 8% THC\" },\r\n      { value: 0.12, label: \"Medium flower, about 12% THC\" },\r\n      { value: 0.20, label: \"Strong flower, about 20% THC\" },\r\n      { value: 0.25, label: \"Very strong flower, about 25% THC\" },\r\n      { value: 0.60, label: \"Concentrate, about 60% THC\" },\r\n    ],\r\n    frequency: [\r\n      { value: 0.25, label: \"Once\" },\r\n      { value: 0.4, label: \"1-2 days per week\" },\r\n      { value: 0.65, label: \"3-4 days per week\" },\r\n      { value: 0.85, label: \"5-6 days per week\" },\r\n      { value: 1, label: \"Every day\" },\r\n      { value: 1.15, label: \"Many times every day\" },\r\n    ],\r\n    duration: [\r\n      { value: 0.5, label: \"One time only\" },\r\n      { value: 0.7, label: \"Less than 1 month\" },\r\n      { value: 0.9, label: \"1-3 months\" },\r\n      { value: 1, label: \"3-12 months\" },\r\n      { value: 1.15, label: \"1-3 years\" },\r\n      { value: 1.3, label: \"More than 3 years\" },\r\n    ],\r\n    route: [\r\n      { value: 1, label: \"Smoked flower\" },\r\n      { value: 1.15, label: \"Vaped flower\" },\r\n      { value: 1.2, label: \"Edibles\" },\r\n      { value: 1.5, label: \"Concentrates \/ carts \/ dabs\" },\r\n      { value: 1.35, label: \"Mixed methods\" },\r\n    ],\r\n    body: [\r\n      { value: 0.9, label: \"Lean \/ low body fat\" },\r\n      { value: 1, label: \"Average\" },\r\n      { value: 1.15, label: \"Higher body fat\" },\r\n      { value: 1.25, label: \"Very high body fat\" },\r\n    ],\r\n    activity: [\r\n      { value: 0.95, label: \"Very active most days\" },\r\n      { value: 1, label: \"Average activity\" },\r\n      { value: 1.1, label: \"Mostly sedentary\" },\r\n    ],\r\n    test: [\r\n      { value: 0.8, label: \"Higher cutoff screen, about 50 ng\/mL\" },\r\n      { value: 1, label: \"Common screen plus confirmation\" },\r\n      { value: 1.1, label: \"Sensitive confirmation, about 15 ng\/mL\" },\r\n      { value: 1.25, label: \"Very sensitive test, below 15 ng\/mL\" },\r\n    ],\r\n  };\r\n\r\n  const BASE_RANGES = [\r\n    { max: 0.3, type: \"Very light \/ one small use\", low: 1, high: 3 },\r\n    { max: 0.8, type: \"Light occasional use\", low: 2, high: 5 },\r\n    { max: 1.5, type: \"Moderate occasional use\", low: 4, high: 10 },\r\n    { max: 3.5, type: \"Regular use\", low: 7, high: 18 },\r\n    { max: 6, type: \"Daily or near-daily use\", low: 14, high: 35 },\r\n    { max: 9, type: \"Heavy daily use\", low: 25, high: 50 },\r\n    { max: Infinity, type: \"Very heavy chronic use\", low: 35, high: 77, plus: true },\r\n  ];\r\n\r\n  const DEFAULTS = {\r\n    grams: 1.5,\r\n    strength: 0.12,\r\n    frequency: 1,\r\n    duration: 1.15,\r\n    route: 1,\r\n    body: 1,\r\n    activity: 1,\r\n    test: 1,\r\n  };\r\n\r\n  function clamp(value, min, max) {\r\n    return Math.min(Math.max(value, min), max);\r\n  }\r\n\r\n  function roundDays(value) {\r\n    return Math.max(1, Math.round(value));\r\n  }\r\n\r\n  function formatWeeks(days) {\r\n    if (days < 7) return `${days} day${days === 1 ? \"\" : \"s\"}`;\r\n    const weeks = days \/ 7;\r\n    return `${weeks.toFixed(weeks < 10 ? 1 : 0)} weeks`;\r\n  }\r\n\r\n  function getBaseRange(loadScore) {\r\n    return BASE_RANGES.find((range) => loadScore < range.max) || BASE_RANGES[BASE_RANGES.length - 1];\r\n  }\r\n\r\n  function calculate(values) {\r\n    const grams = clamp(Number(values.grams) || DEFAULTS.grams, 0.01, 20);\r\n    const strength = Number(values.strength) || DEFAULTS.strength;\r\n    const frequency = Number(values.frequency) || DEFAULTS.frequency;\r\n    const duration = Number(values.duration) || DEFAULTS.duration;\r\n    const route = Number(values.route) || DEFAULTS.route;\r\n    const body = Number(values.body) || DEFAULTS.body;\r\n    const activity = Number(values.activity) || DEFAULTS.activity;\r\n    const test = Number(values.test) || DEFAULTS.test;\r\n\r\n    const thcMg = grams * 1000 * strength;\r\n    const doseScore = clamp(thcMg \/ 50, 0.2, 8);\r\n    const loadScore = doseScore * frequency * duration * route;\r\n    const base = getBaseRange(loadScore);\r\n    const adjustment = body * activity * test;\r\n    const lowDays = roundDays(base.low * adjustment);\r\n    const highDays = roundDays(base.high * adjustment);\r\n    const midDays = roundDays((lowDays + highDays) \/ 2);\r\n\r\n    let confidence = \"Medium\";\r\n    if (base.high >= 50 || adjustment > 1.25 || loadScore > 6) confidence = \"Low\";\r\n    if (loadScore < 0.8 && adjustment >= 0.9 && adjustment <= 1.1) confidence = \"Medium-high\";\r\n\r\n    return {\r\n      grams,\r\n      strength,\r\n      thcMg,\r\n      doseScore,\r\n      loadScore,\r\n      base,\r\n      adjustment,\r\n      lowDays,\r\n      highDays,\r\n      midDays,\r\n      confidence,\r\n    };\r\n  }\r\n\r\n  function injectStyles() {\r\n    if (document.getElementById(\"wuc-styles\")) return;\r\n    const style = document.createElement(\"style\");\r\n    style.id = \"wuc-styles\";\r\n    style.textContent = `\r\n      .wuc-widget {\r\n        --wuc-ink: #17201c;\r\n        --wuc-muted: #60706a;\r\n        --wuc-line: #d8e1db;\r\n        --wuc-soft: #f5f8f4;\r\n        --wuc-panel: #ffffff;\r\n        --wuc-accent: #2f7d56;\r\n        --wuc-accent-2: #b45d32;\r\n        --wuc-accent-3: #426bb0;\r\n        color: var(--wuc-ink);\r\n        background: var(--wuc-panel);\r\n        border: 1px solid var(--wuc-line);\r\n        border-radius: 8px;\r\n        box-shadow: 0 18px 50px rgba(23, 32, 28, 0.10);\r\n        font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, \"Segoe UI\", 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var(--wuc-ink);\r\n      }\r\n      .wuc-output {\r\n        display: grid;\r\n        align-content: start;\r\n        gap: 18px;\r\n        padding: 24px;\r\n        background: var(--wuc-soft);\r\n        border-left: 1px solid var(--wuc-line);\r\n      }\r\n      .wuc-result-main {\r\n        display: grid;\r\n        gap: 8px;\r\n        padding-bottom: 18px;\r\n        border-bottom: 1px solid var(--wuc-line);\r\n      }\r\n      .wuc-result-label {\r\n        color: var(--wuc-muted);\r\n        font-size: 13px;\r\n        font-weight: 700;\r\n      }\r\n      .wuc-result-days {\r\n        font-size: 36px;\r\n        line-height: 1.1;\r\n        font-weight: 900;\r\n        letter-spacing: 0;\r\n      }\r\n      .wuc-result-weeks {\r\n        color: var(--wuc-muted);\r\n        font-size: 15px;\r\n        line-height: 1.45;\r\n      }\r\n      .wuc-meter {\r\n        height: 10px;\r\n        border-radius: 999px;\r\n        background: #dfe8e2;\r\n        overflow: hidden;\r\n    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.join(\"\");\r\n  }\r\n\r\n  function render(container, initialValues) {\r\n    const values = Object.assign({}, DEFAULTS, initialValues || {});\r\n    container.innerHTML = `\r\n      <section class=\"wuc-widget\" aria-label=\"Weed urine clearance calculator\">\r\n        <header class=\"wuc-header\">\r\n          <div class=\"wuc-kicker\">Approximate urine detection estimator<\/div>\r\n          <h2 class=\"wuc-title\">Cannabis Urine Clearance Calculator<\/h2>\r\n          <p class=\"wuc-note\">This tool estimates a broad detection range from self-reported use. It is based on published urine excretion studies, but it cannot predict a real lab result for one person.<\/p>\r\n        <\/header>\r\n        <div class=\"wuc-body\">\r\n          <form class=\"wuc-form\">\r\n            <div class=\"wuc-grid\">\r\n              <div class=\"wuc-field\">\r\n                <label for=\"wuc-grams\">Grams used on a typical use day<\/label>\r\n                <input id=\"wuc-grams\" name=\"grams\" type=\"number\" min=\"0.01\" max=\"20\" step=\"0.05\" value=\"${values.grams}\">\r\n                <small>For 1-2 grams, enter 1.5.<\/small>\r\n              <\/div>\r\n              <div class=\"wuc-field\">\r\n                <label for=\"wuc-strength\">Cannabis strength<\/label>\r\n                <select id=\"wuc-strength\" name=\"strength\">${optionMarkup(FACTORS.strength, values.strength)}<\/select>\r\n              <\/div>\r\n              <div class=\"wuc-field\">\r\n                <label for=\"wuc-frequency\">Use frequency<\/label>\r\n                <select id=\"wuc-frequency\" name=\"frequency\">${optionMarkup(FACTORS.frequency, values.frequency)}<\/select>\r\n              <\/div>\r\n              <div class=\"wuc-field\">\r\n                <label for=\"wuc-duration\">How long at this pattern<\/label>\r\n                <select id=\"wuc-duration\" name=\"duration\">${optionMarkup(FACTORS.duration, values.duration)}<\/select>\r\n              <\/div>\r\n              <div class=\"wuc-field\">\r\n                <label for=\"wuc-route\">Main route<\/label>\r\n                <select id=\"wuc-route\" name=\"route\">${optionMarkup(FACTORS.route, values.route)}<\/select>\r\n              <\/div>\r\n              <div class=\"wuc-field\">\r\n                <label for=\"wuc-body\">Body type<\/label>\r\n                <select id=\"wuc-body\" name=\"body\">${optionMarkup(FACTORS.body, values.body)}<\/select>\r\n              <\/div>\r\n              <div class=\"wuc-field\">\r\n                <label for=\"wuc-activity\">Lifestyle activity<\/label>\r\n                <select id=\"wuc-activity\" name=\"activity\">${optionMarkup(FACTORS.activity, values.activity)}<\/select>\r\n              <\/div>\r\n              <div class=\"wuc-field\">\r\n                <label for=\"wuc-test\">Test sensitivity<\/label>\r\n                <select id=\"wuc-test\" name=\"test\">${optionMarkup(FACTORS.test, values.test)}<\/select>\r\n              <\/div>\r\n            <\/div>\r\n            <div class=\"wuc-actions\">\r\n              <button class=\"wuc-button wuc-button-primary\" type=\"submit\">Calculate<\/button>\r\n              <button class=\"wuc-button wuc-button-secondary\" type=\"button\" data-wuc-reset>Reset<\/button>\r\n            <\/div>\r\n          <\/form>\r\n          <aside class=\"wuc-output\" aria-live=\"polite\">\r\n            <div class=\"wuc-result-main\">\r\n              <div class=\"wuc-result-label\">Estimated urine detection range<\/div>\r\n              <div class=\"wuc-result-days\" data-wuc-days><\/div>\r\n              <div class=\"wuc-result-weeks\" data-wuc-weeks><\/div>\r\n              <div class=\"wuc-meter\" aria-hidden=\"true\"><div class=\"wuc-meter-bar\" data-wuc-meter><\/div><\/div>\r\n            <\/div>\r\n            <p class=\"wuc-explain\" data-wuc-explain><\/p>\r\n            <div class=\"wuc-warning\">This is an educational estimate. It should not be used as proof that a real test will be negative.<\/div>\r\n          <\/aside>\r\n        <\/div>\r\n      <\/section>\r\n    `;\r\n\r\n    const form = container.querySelector(\".wuc-form\");\r\n    const resetButton = container.querySelector(\"[data-wuc-reset]\");\r\n\r\n    function readValues() {\r\n      const data = new FormData(form);\r\n      return {\r\n        grams: data.get(\"grams\"),\r\n        strength: data.get(\"strength\"),\r\n        frequency: data.get(\"frequency\"),\r\n        duration: data.get(\"duration\"),\r\n        route: data.get(\"route\"),\r\n        body: data.get(\"body\"),\r\n        activity: data.get(\"activity\"),\r\n        test: data.get(\"test\"),\r\n      };\r\n    }\r\n\r\n    function update() {\r\n      const result = calculate(readValues());\r\n      const plus = result.base.plus ? \"+\" : \"\";\r\n      const daysText = `${result.lowDays}-${result.highDays}${plus} days`;\r\n      const weeksText = `${formatWeeks(result.lowDays)} to ${formatWeeks(result.highDays)}${plus}`;\r\n      const meterWidth = clamp((result.loadScore \/ 10) * 100, 8, 100);\r\n\r\n      container.querySelector(\"[data-wuc-days]\").textContent = daysText;\r\n      container.querySelector(\"[data-wuc-weeks]\").textContent = weeksText;\r\n      container.querySelector(\"[data-wuc-meter]\").style.width = `${meterWidth}%`;\r\n      container.querySelector(\"[data-wuc-load]\").textContent = result.loadScore.toFixed(2);\r\n      container.querySelector(\"[data-wuc-type]\").textContent = result.base.type;\r\n      container.querySelector(\"[data-wuc-thc]\").textContent = `${Math.round(result.thcMg)} mg\/day in product`;\r\n      container.querySelector(\"[data-wuc-confidence]\").textContent = result.confidence;\r\n      container.querySelector(\"[data-wuc-explain]\").textContent =\r\n        `The middle of this estimate is about ${result.midDays} days. Amount and frequency are the strongest inputs; body type and activity are small adjustments.`;\r\n    }\r\n\r\n    form.addEventListener(\"submit\", (event) => {\r\n      event.preventDefault();\r\n      update();\r\n    });\r\n\r\n    form.addEventListener(\"input\", update);\r\n    form.addEventListener(\"change\", update);\r\n\r\n    resetButton.addEventListener(\"click\", () => {\r\n      form.grams.value = DEFAULTS.grams;\r\n      form.strength.value = DEFAULTS.strength;\r\n      form.frequency.value = DEFAULTS.frequency;\r\n      form.duration.value = DEFAULTS.duration;\r\n      form.route.value = DEFAULTS.route;\r\n      form.body.value = DEFAULTS.body;\r\n      form.activity.value = DEFAULTS.activity;\r\n      form.test.value = DEFAULTS.test;\r\n      update();\r\n    });\r\n\r\n    update();\r\n  }\r\n\r\n  function mount(target, options) {\r\n    const container = typeof target === \"string\" ? document.querySelector(target) : target;\r\n    if (!container) return null;\r\n    injectStyles();\r\n    render(container, options && options.values);\r\n    return {\r\n      recalculate() {\r\n        const form = container.querySelector(\".wuc-form\");\r\n        if (form) form.dispatchEvent(new Event(\"submit\", { cancelable: true }));\r\n      },\r\n    };\r\n  }\r\n\r\n  window.WeedUrineClearanceCalculator = { mount, calculate };\r\n\r\n  document.addEventListener(\"DOMContentLoaded\", () => {\r\n    document.querySelectorAll(\"[data-weed-urine-calculator], #weed-urine-calculator\").forEach((node) => {\r\n      if (!node.dataset.wucMounted) {\r\n        node.dataset.wucMounted = \"true\";\r\n        mount(node);\r\n      }\r\n    });\r\n  });\r\n})();\r\n\r\n<\/script>\n<h2 data-heading=\"What urine tests usually look for\">What urine tests usually look for<\/h2>\n<p>Most urine tests do not look for the feeling of being high. They usually look for THCCOOH, an inactive THC metabolite.<\/p>\n<p>THC is the main chemical in cannabis that causes the high. After THC enters the body, the liver changes it into other chemicals. One important chemical is THCCOOH. This chemical can stay in urine longer than the high lasts.<\/p>\n<p>THC is fat-soluble. That means it can move into body fat and slowly come back out over time. This is one reason frequent users can test positive for much longer than one-time users.<\/p>\n<h2 data-heading=\"What the studies show\">What the studies show<\/h2>\n<p>Here are the main scientific points used for this calculator:<\/p>\n<table>\n<thead>\n<tr>\n<th>Study finding<\/th>\n<th>What it means for the calculator<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>In a controlled smoking study, one smoked cannabis cigarette produced average last-positive urine times of about 34 hours for a lower THC dose and about 89 hours for a higher THC dose at a 15 ng\/mL THCCOOH cutoff.<\/td>\n<td>One-time use is often measured in days, not weeks.<\/td>\n<\/tr>\n<tr>\n<td>In monitored abstinence, 60 cannabis users gave 6,158 urine samples. Mean last-positive times were 4.3, 9.7, and 15.4 days depending on starting creatinine-normalized THCCOOH level.<\/td>\n<td>Heavier starting body load means longer detection.<\/td>\n<\/tr>\n<tr>\n<td>In 86 chronic users, the mean excretion time was 27 days. Some stayed positive for 46 straight days, and one endpoint took up to 77 days.<\/td>\n<td>Heavy chronic users can have a long tail.<\/td>\n<\/tr>\n<tr>\n<td>In frequent and infrequent users, creatinine-normalized urine curves were smoother than raw urine concentration curves. Infrequent users had last positive specimens around 4 days at a 15 ng\/mL cutoff; frequent users around 17 days.<\/td>\n<td>Frequency matters a lot.<\/td>\n<\/tr>\n<tr>\n<td>In heavy users, urinary metabolite half-life ranged from 0.8 to 9.8 days, with a mean of 3.0 days.<\/td>\n<td>Heavy users vary a lot.<\/td>\n<\/tr>\n<tr>\n<td>THC is highly fat-soluble. Inhaled THC bioavailability is about 10%-35%; oral THC bioavailability is lower, about 4%-12%.<\/td>\n<td>Route and body storage matter.<\/td>\n<\/tr>\n<tr>\n<td>Exercise caused a small rise in blood THC in regular users, and the rise was linked with BMI.<\/td>\n<td>Activity\/body fat may matter, but this is a weak urine predictor.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Because of these findings, the calculator uses a score instead of pretending to know the exact urine THCCOOH level.<\/p>\n<h2 data-heading=\"The basic idea\">The basic idea<\/h2>\n<p>The calculator estimates a &#8220;Cannabis Load Score.&#8221;<\/p>\n<p>The score is not a real lab value. It is a rough way to turn user information into a detection-window group.<\/p>\n<p>The formula is:<\/p>\n<pre><code class=\"language-text\">Cannabis Load Score =\r\nDose Score x Frequency Factor x Duration Factor x Route Factor\r\n<\/code><\/pre>\n<p>Then we adjust the result:<\/p>\n<pre><code class=\"language-text\">Final Estimate =\r\nBase Range x Body Factor x Activity Factor x Test Factor\r\n<\/code><\/pre>\n<h2 data-heading=\"Step 1: Estimate THC per day\">Step 1: Estimate THC per day<\/h2>\n<p>First, estimate how much THC is in the cannabis used each day.<\/p>\n<p>Use this formula:<\/p>\n<pre><code class=\"language-text\">THC mg per day = grams per day x 1000 x THC strength\r\n<\/code><\/pre>\n<p>Use THC strength as a decimal:<\/p>\n<table>\n<thead>\n<tr>\n<th>Strength<\/th>\n<th align=\"right\">Use this number<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Low strength flower<\/td>\n<td align=\"right\">0.08<\/td>\n<\/tr>\n<tr>\n<td>Medium strength flower<\/td>\n<td align=\"right\">0.12<\/td>\n<\/tr>\n<tr>\n<td>Strong flower<\/td>\n<td align=\"right\">0.20<\/td>\n<\/tr>\n<tr>\n<td>Very strong flower<\/td>\n<td align=\"right\">0.25<\/td>\n<\/tr>\n<tr>\n<td>Concentrate<\/td>\n<td align=\"right\">0.50-0.80<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Example:<\/p>\n<pre><code class=\"language-text\">1.5 grams per day x 1000 x 0.12 = 180 mg THC in the flower per day\r\n<\/code><\/pre>\n<p>Important: this does not mean the body absorbs all 180 mg. Inhaled THC bioavailability is often about 10%-35%. The number is used only to estimate the person&#8217;s use level.<\/p>\n<h2 data-heading=\"Step 2: Convert THC per day into Dose Score\">Step 2: Convert THC per day into Dose Score<\/h2>\n<pre><code class=\"language-text\">Dose Score = THC mg per day \/ 50\r\n<\/code><\/pre>\n<p>Then keep it between 0.2 and 8.<\/p>\n<p>Examples:<\/p>\n<table>\n<thead>\n<tr>\n<th>THC in product per day<\/th>\n<th align=\"right\">Dose Score<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>10 mg<\/td>\n<td align=\"right\">0.2<\/td>\n<\/tr>\n<tr>\n<td>25 mg<\/td>\n<td align=\"right\">0.5<\/td>\n<\/tr>\n<tr>\n<td>50 mg<\/td>\n<td align=\"right\">1.0<\/td>\n<\/tr>\n<tr>\n<td>100 mg<\/td>\n<td align=\"right\">2.0<\/td>\n<\/tr>\n<tr>\n<td>150 mg<\/td>\n<td align=\"right\">3.0<\/td>\n<\/tr>\n<tr>\n<td>200 mg<\/td>\n<td align=\"right\">4.0<\/td>\n<\/tr>\n<tr>\n<td>300 mg<\/td>\n<td align=\"right\">6.0<\/td>\n<\/tr>\n<tr>\n<td>400+ mg<\/td>\n<td align=\"right\">8.0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 data-heading=\"Step 3: Add Frequency Factor\">Step 3: Add Frequency Factor<\/h2>\n<table>\n<thead>\n<tr>\n<th>Use frequency<\/th>\n<th align=\"right\">Frequency Factor<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Once<\/td>\n<td align=\"right\">0.25<\/td>\n<\/tr>\n<tr>\n<td>1-2 days per week<\/td>\n<td align=\"right\">0.40<\/td>\n<\/tr>\n<tr>\n<td>3-4 days per week<\/td>\n<td align=\"right\">0.65<\/td>\n<\/tr>\n<tr>\n<td>5-6 days per week<\/td>\n<td align=\"right\">0.85<\/td>\n<\/tr>\n<tr>\n<td>Every day<\/td>\n<td align=\"right\">1.00<\/td>\n<\/tr>\n<tr>\n<td>Many times every day<\/td>\n<td align=\"right\">1.15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 data-heading=\"Step 4: Add Duration Factor\">Step 4: Add Duration Factor<\/h2>\n<p>How long the person has used at this pattern matters. Longer use gives the body more time to build a stored THC\/metabolite pool.<\/p>\n<table>\n<thead>\n<tr>\n<th>Time using this pattern<\/th>\n<th align=\"right\">Duration Factor<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>One time only<\/td>\n<td align=\"right\">0.50<\/td>\n<\/tr>\n<tr>\n<td>Less than 1 month<\/td>\n<td align=\"right\">0.70<\/td>\n<\/tr>\n<tr>\n<td>1-3 months<\/td>\n<td align=\"right\">0.90<\/td>\n<\/tr>\n<tr>\n<td>3-12 months<\/td>\n<td align=\"right\">1.00<\/td>\n<\/tr>\n<tr>\n<td>1-3 years<\/td>\n<td align=\"right\">1.15<\/td>\n<\/tr>\n<tr>\n<td>More than 3 years<\/td>\n<td align=\"right\">1.30<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 data-heading=\"Step 5: Add Route Factor\">Step 5: Add Route Factor<\/h2>\n<table>\n<thead>\n<tr>\n<th>Main route<\/th>\n<th align=\"right\">Route Factor<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Smoked flower<\/td>\n<td align=\"right\">1.00<\/td>\n<\/tr>\n<tr>\n<td>Vaped flower<\/td>\n<td align=\"right\">1.15<\/td>\n<\/tr>\n<tr>\n<td>Edibles<\/td>\n<td align=\"right\">1.20<\/td>\n<\/tr>\n<tr>\n<td>Concentrates \/ dabs \/ carts<\/td>\n<td align=\"right\">1.50<\/td>\n<\/tr>\n<tr>\n<td>Mixed methods<\/td>\n<td align=\"right\">1.20-1.50<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Why? Controlled studies show route matters. Vaporized cannabis can produce higher urine THCCOOH than the same THC dose smoked. Oral cannabis can also have a different and longer pattern.<\/p>\n<h2 data-heading=\"Step 6: Find the base detection range\">Step 6: Find the base detection range<\/h2>\n<p>Now calculate:<\/p>\n<pre><code class=\"language-text\">Cannabis Load Score =\r\nDose Score x Frequency Factor x Duration Factor x Route Factor\r\n<\/code><\/pre>\n<p>Then use this table:<\/p>\n<table>\n<thead>\n<tr>\n<th align=\"right\">Cannabis Load Score<\/th>\n<th>User type<\/th>\n<th align=\"right\">Base urine estimate<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"right\">Less than 0.3<\/td>\n<td>Very light \/ one small use<\/td>\n<td align=\"right\">1-3 days<\/td>\n<\/tr>\n<tr>\n<td align=\"right\">0.3-0.8<\/td>\n<td>Light occasional use<\/td>\n<td align=\"right\">2-5 days<\/td>\n<\/tr>\n<tr>\n<td align=\"right\">0.8-1.5<\/td>\n<td>Moderate occasional use<\/td>\n<td align=\"right\">4-10 days<\/td>\n<\/tr>\n<tr>\n<td align=\"right\">1.5-3.5<\/td>\n<td>Regular use<\/td>\n<td align=\"right\">7-18 days<\/td>\n<\/tr>\n<tr>\n<td align=\"right\">3.5-6.0<\/td>\n<td>Daily or near-daily use<\/td>\n<td align=\"right\">14-35 days<\/td>\n<\/tr>\n<tr>\n<td align=\"right\">6.0-9.0<\/td>\n<td>Heavy daily use<\/td>\n<td align=\"right\">25-50 days<\/td>\n<\/tr>\n<tr>\n<td align=\"right\">More than 9.0<\/td>\n<td>Very heavy chronic use<\/td>\n<td align=\"right\">35-77+ days<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>This table is the heart of the method. It is calibrated to the published urine studies, especially the controlled single-use studies, the monitored abstinence studies, and the chronic-user studies.<\/p>\n<h2 data-heading=\"Step 7: Adjust for body type\">Step 7: Adjust for body type<\/h2>\n<p>This part is weaker than the use-pattern part. We know THC is fat-soluble, but studies do not give a perfect urine formula for body fat.<\/p>\n<p>Use a small adjustment only:<\/p>\n<table>\n<thead>\n<tr>\n<th>Body type<\/th>\n<th align=\"right\">Body Factor<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Lean \/ low body fat<\/td>\n<td align=\"right\">0.90<\/td>\n<\/tr>\n<tr>\n<td>Average<\/td>\n<td align=\"right\">1.00<\/td>\n<\/tr>\n<tr>\n<td>Higher body fat<\/td>\n<td align=\"right\">1.15<\/td>\n<\/tr>\n<tr>\n<td>Obese or very high body fat<\/td>\n<td align=\"right\">1.25<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 data-heading=\"Step 8: Adjust for lifestyle activity\">Step 8: Adjust for lifestyle activity<\/h2>\n<p>Activity is not magic. There is no strong proof that exercise quickly clears urine faster. One study found exercise can raise blood THC a little in regular users, likely because THC can come out of fat stores.<\/p>\n<p>So use only a small activity factor:<\/p>\n<table>\n<thead>\n<tr>\n<th>Lifestyle<\/th>\n<th align=\"right\">Activity Factor<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Very active most days<\/td>\n<td align=\"right\">0.95<\/td>\n<\/tr>\n<tr>\n<td>Average activity<\/td>\n<td align=\"right\">1.00<\/td>\n<\/tr>\n<tr>\n<td>Mostly sedentary<\/td>\n<td align=\"right\">1.10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Do not overuse this factor. Frequency and amount matter much more.<\/p>\n<h2 data-heading=\"Step 9: Adjust for test sensitivity\">Step 9: Adjust for test sensitivity<\/h2>\n<p>Different tests use different cutoffs.<\/p>\n<table>\n<thead>\n<tr>\n<th>Test type<\/th>\n<th align=\"right\">Test Factor<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Higher cutoff screen, about 50 ng\/mL<\/td>\n<td align=\"right\">0.80<\/td>\n<\/tr>\n<tr>\n<td>Common screen plus confirmation<\/td>\n<td align=\"right\">1.00<\/td>\n<\/tr>\n<tr>\n<td>Sensitive confirmation, about 15 ng\/mL<\/td>\n<td align=\"right\">1.10<\/td>\n<\/tr>\n<tr>\n<td>Very sensitive test, below 15 ng\/mL<\/td>\n<td align=\"right\">1.25<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>If the person does not know the test type, use 1.00.<\/p>\n<h2 data-heading=\"Step 10: Calculate the final range\">Step 10: Calculate the final range<\/h2>\n<p>Multiply the base range by the body, activity, and test factors:<\/p>\n<pre><code class=\"language-text\">Final low estimate =\r\nbase low x body factor x activity factor x test factor\r\n\r\nFinal high estimate =\r\nbase high x body factor x activity factor x test factor\r\n<\/code><\/pre>\n<p>Round to whole days.<\/p>\n<h2 data-heading=\"Example 1: daily medium flower, 1-2 grams per day\">Example 1: daily medium flower, 1-2 grams per day<\/h2>\n<p>User information:<\/p>\n<ul>\n<li>smoked flower<\/li>\n<li>medium strength<\/li>\n<li>1-2 grams per day, use 1.5 g as the middle<\/li>\n<li>every day<\/li>\n<li>used for 1 year<\/li>\n<li>average body type<\/li>\n<li>average activity<\/li>\n<li>unknown test, use 1.00<\/li>\n<\/ul>\n<p>Step 1:<\/p>\n<pre><code class=\"language-text\">THC mg per day = 1.5 x 1000 x 0.12 = 180 mg\r\n<\/code><\/pre>\n<p>Step 2:<\/p>\n<pre><code class=\"language-text\">Dose Score = 180 \/ 50 = 3.6\r\n<\/code><\/pre>\n<p>Step 3-5:<\/p>\n<pre><code class=\"language-text\">Frequency Factor = 1.00\r\nDuration Factor = 1.15\r\nRoute Factor = 1.00\r\n<\/code><\/pre>\n<p>Step 6:<\/p>\n<pre><code class=\"language-text\">Cannabis Load Score = 3.6 x 1.00 x 1.15 x 1.00 = 4.14\r\n<\/code><\/pre>\n<p>A score of 4.14 falls into:<\/p>\n<pre><code class=\"language-text\">Daily or near-daily use = 14-35 days\r\n<\/code><\/pre>\n<p>Step 7-10:<\/p>\n<pre><code class=\"language-text\">Body Factor = 1.00\r\nActivity Factor = 1.00\r\nTest Factor = 1.00\r\n\r\nFinal estimate = 14-35 days\r\n<\/code><\/pre>\n<p>Plain answer:<\/p>\n<p>For this person, a rough urine detection estimate is about 2-5 weeks. Some people may clear faster. Heavy long-term users may take longer.<\/p>\n<h2 data-heading=\"Example 2: same user, but passive lifestyle and higher body fat\">Example 2: same user, but passive lifestyle and higher body fat<\/h2>\n<p>Same use pattern:<\/p>\n<ul>\n<li>1.5 g per day<\/li>\n<li>medium strength<\/li>\n<li>every day<\/li>\n<li>1 year<\/li>\n<\/ul>\n<p>But now:<\/p>\n<ul>\n<li>higher body fat: 1.15<\/li>\n<li>mostly sedentary: 1.10<\/li>\n<li>unknown test: 1.00<\/li>\n<\/ul>\n<p>Base range:<\/p>\n<pre><code class=\"language-text\">14-35 days\r\n<\/code><\/pre>\n<p>Adjustment:<\/p>\n<pre><code class=\"language-text\">14 x 1.15 x 1.10 = 17.7\r\n35 x 1.15 x 1.10 = 44.3\r\n<\/code><\/pre>\n<p>Final estimate:<\/p>\n<pre><code class=\"language-text\">18-44 days\r\n<\/code><\/pre>\n<p>Plain answer:<\/p>\n<p>For this person, a rough estimate is about 3-6 weeks.<\/p>\n<h2 data-heading=\"Example 3: active person, 0.5 g per day, 3-4 days per week\">Example 3: active person, 0.5 g per day, 3-4 days per week<\/h2>\n<p>User information:<\/p>\n<ul>\n<li>smoked flower<\/li>\n<li>medium strength<\/li>\n<li>0.5 g per day on use days<\/li>\n<li>3-4 days per week<\/li>\n<li>used for 6 months<\/li>\n<li>lean body type<\/li>\n<li>very active<\/li>\n<li>unknown test<\/li>\n<\/ul>\n<p>Step 1:<\/p>\n<pre><code class=\"language-text\">THC mg per use day = 0.5 x 1000 x 0.12 = 60 mg\r\n<\/code><\/pre>\n<p>Step 2:<\/p>\n<pre><code class=\"language-text\">Dose Score = 60 \/ 50 = 1.2\r\n<\/code><\/pre>\n<p>Step 3-5:<\/p>\n<pre><code class=\"language-text\">Frequency Factor = 0.65\r\nDuration Factor = 1.00\r\nRoute Factor = 1.00\r\n\r\nCannabis Load Score = 1.2 x 0.65 x 1.00 x 1.00 = 0.78\r\n<\/code><\/pre>\n<p>Base range:<\/p>\n<pre><code class=\"language-text\">Light occasional use = 2-5 days\r\n<\/code><\/pre>\n<p>Adjust:<\/p>\n<pre><code class=\"language-text\">Body Factor = 0.90\r\nActivity Factor = 0.95\r\nTest Factor = 1.00\r\n\r\n2 x 0.90 x 0.95 = 1.7\r\n5 x 0.90 x 0.95 = 4.3\r\n<\/code><\/pre>\n<p>Final estimate:<\/p>\n<pre><code class=\"language-text\">2-4 days\r\n<\/code><\/pre>\n<p>Plain answer:<\/p>\n<p>This person may be closer to a few days, not weeks. But repeated use can still make the window longer than a single use.<\/p>\n<h2 data-heading=\"Example 4: very heavy concentrate use\">Example 4: very heavy concentrate use<\/h2>\n<p>User information:<\/p>\n<ul>\n<li>carts or dabs<\/li>\n<li>high THC concentrate<\/li>\n<li>equal to about 300 mg THC product per day<\/li>\n<li>many times every day<\/li>\n<li>more than 3 years<\/li>\n<li>average body<\/li>\n<li>sedentary<\/li>\n<li>sensitive test<\/li>\n<\/ul>\n<p>Step 1-6:<\/p>\n<pre><code class=\"language-text\">Dose Score = 300 \/ 50 = 6\r\nFrequency Factor = 1.15\r\nDuration Factor = 1.30\r\nRoute Factor = 1.50\r\n\r\nCannabis Load Score = 6 x 1.15 x 1.30 x 1.50 = 13.46\r\n<\/code><\/pre>\n<p>Base range:<\/p>\n<pre><code class=\"language-text\">Very heavy chronic use = 35-77+ days\r\n<\/code><\/pre>\n<p>Adjust:<\/p>\n<pre><code class=\"language-text\">Body Factor = 1.00\r\nActivity Factor = 1.10\r\nTest Factor = 1.10\r\n\r\n35 x 1.00 x 1.10 x 1.10 = 42.4\r\n77 x 1.00 x 1.10 x 1.10 = 93.2\r\n<\/code><\/pre>\n<p>Final estimate:<\/p>\n<pre><code class=\"language-text\">42-93+ days\r\n<\/code><\/pre>\n<p>Plain answer:<\/p>\n<p>This is a long-tail case. The estimate is about 6-13+ weeks. This is not the average person, but it is possible for very heavy chronic use.<\/p>\n<h2 data-heading=\"A short version of the calculator\">A short version of the calculator<\/h2>\n<p>Use this if you want a quick estimate:<\/p>\n<ol>\n<li>Estimate THC mg per day:<\/li>\n<\/ol>\n<pre><code class=\"language-text\">grams x 1000 x strength\r\n<\/code><\/pre>\n<ol start=\"2\">\n<li>Find Dose Score:<\/li>\n<\/ol>\n<pre><code class=\"language-text\">THC mg per day \/ 50\r\n<\/code><\/pre>\n<ol start=\"3\">\n<li>Multiply:<\/li>\n<\/ol>\n<pre><code class=\"language-text\">Dose Score x Frequency Factor x Duration Factor x Route Factor\r\n<\/code><\/pre>\n<ol start=\"4\">\n<li>Match the score to the base range.<\/li>\n<li>Multiply the range by:<\/li>\n<\/ol>\n<pre><code class=\"language-text\">Body Factor x Activity Factor x Test Factor\r\n<\/code><\/pre>\n<ol start=\"6\">\n<li>Round the answer to days.<\/li>\n<\/ol>\n<h2 data-heading=\"Why this method is still uncertain\">Why this method is still uncertain<\/h2>\n<p>This method is better than saying &#8220;weed stays 30 days&#8221; for everyone. But it is still rough.<\/p>\n<p>It cannot know:<\/p>\n<ul>\n<li>the true THC percent in the cannabis<\/li>\n<li>how deeply a person inhaled<\/li>\n<li>how much THC was really absorbed<\/li>\n<li>the person&#8217;s exact metabolism<\/li>\n<li>their real urine concentration<\/li>\n<li>the exact lab cutoff<\/li>\n<li>whether the first urine sample is before or after the metabolite peak<\/li>\n<\/ul>\n<p>The estimate should be read like a weather forecast. It gives a likely range, not a promise.<\/p>\n<h2 data-heading=\"Simple final guide\">Simple final guide<\/h2>\n<table>\n<thead>\n<tr>\n<th>User pattern<\/th>\n<th align=\"right\">Simple estimate<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>One-time use<\/td>\n<td align=\"right\">1-4 days<\/td>\n<\/tr>\n<tr>\n<td>Light occasional use<\/td>\n<td align=\"right\">2-7 days<\/td>\n<\/tr>\n<tr>\n<td>Moderate repeated use<\/td>\n<td align=\"right\">5-14 days<\/td>\n<\/tr>\n<tr>\n<td>Frequent use<\/td>\n<td align=\"right\">1-3 weeks<\/td>\n<\/tr>\n<tr>\n<td>Daily use<\/td>\n<td align=\"right\">2-5 weeks<\/td>\n<\/tr>\n<tr>\n<td>Heavy daily use<\/td>\n<td align=\"right\">4-8 weeks<\/td>\n<\/tr>\n<tr>\n<td>Very heavy chronic use<\/td>\n<td align=\"right\">6-11+ weeks<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For a person who smoked medium-strength cannabis every day at about 1-2 grams per day, the calculator usually lands around 2-5 weeks if body type and activity are average. With higher body fat and a passive lifestyle, the estimate can move closer to 3-6 weeks. With years of heavy daily use, the long-tail range can be longer.<\/p>\n<h2 data-heading=\"Sources\">Sources<\/h2>\n<ol>\n<li>Huestis MA, Mitchell JM, Cone EJ. &#8220;Urinary excretion profiles of 11-nor-9-carboxy-delta 9-tetrahydrocannabinol in humans after single smoked doses of marijuana.&#8221; <em>Journal of Analytical Toxicology<\/em>. 1996;20(6):441-452. DOI: <a class=\"external-link\" href=\"https:\/\/doi.org\/10.1093\/jat\/20.6.441\" target=\"_blank\" rel=\"noopener nofollow\" aria-label=\"https:\/\/doi.org\/10.1093\/jat\/20.6.441\" data-tooltip-position=\"top\">10.1093\/jat\/20.6.441<\/a>. PubMed: <a class=\"external-link\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/8889681\/\" target=\"_blank\" rel=\"noopener nofollow\" aria-label=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/8889681\/\" data-tooltip-position=\"top\">8889681<\/a>.<\/li>\n<li>Goodwin RS, Darwin WD, Chiang CN, Shih M, Li SH, Huestis MA. &#8220;Urinary elimination of 11-nor-9-carboxy-delta9-tetrahydrocannabinol in cannabis users during continuously monitored abstinence.&#8221; <em>Journal of Analytical Toxicology<\/em>. 2008;32(8):562-569. DOI: <a class=\"external-link\" href=\"https:\/\/doi.org\/10.1093\/jat\/32.8.562\" target=\"_blank\" rel=\"noopener nofollow\" aria-label=\"https:\/\/doi.org\/10.1093\/jat\/32.8.562\" data-tooltip-position=\"top\">10.1093\/jat\/32.8.562<\/a>. 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Research shows that the urine detection window [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[],"class_list":["post-3202","post","type-post","status-publish","format-standard","hentry","category-thc-detox-2","wpautop"],"_links":{"self":[{"href":"https:\/\/greenfleets.org\/blog\/wp-json\/wp\/v2\/posts\/3202","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/greenfleets.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/greenfleets.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/greenfleets.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/greenfleets.org\/blog\/wp-json\/wp\/v2\/comments?post=3202"}],"version-history":[{"count":2,"href":"https:\/\/greenfleets.org\/blog\/wp-json\/wp\/v2\/posts\/3202\/revisions"}],"predecessor-version":[{"id":3205,"href":"https:\/\/greenfleets.org\/blog\/wp-json\/wp\/v2\/posts\/3202\/revisions\/3205"}],"wp:attachment":[{"href":"https:\/\/greenfleets.org\/blog\/wp-json\/wp\/v2\/media?parent=3202"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/greenfleets.org\/blog\/wp-json\/wp\/v2\/categories?post=3202"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/greenfleets.org\/blog\/wp-json\/wp\/v2\/tags?post=3202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}