Cannabis Dosage Calculator

ANA›Life Services Authority›National Calculator Authority›Cannabis Dosage Calculator

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Cannabis Dosage Calculator

Estimate a conservative starting dose of cannabis (THC) based on your body weight, experience level, and product potency. Always start low and go slow.

Body Weight

kg lbs

Experience / Tolerance Level

Naïve (never used or <5 times) Low (occasional, <1×/month) Moderate (weekly use) High (daily use)

Route of Administration

Oral / Edible Inhaled (smoked / vaped) Sublingual (tincture)

Product THC Potency (%)

For flower/concentrate enter % THC. For edibles enter mg/serving instead and set potency to 100.

Serving / Unit Size

g mg

For flower: grams per session. For edibles: mg per piece (set potency to 100).

Calculate Dose

function canCalc() { var resultDiv = document.getElementById("can-result");

// --- collect inputs --- var weightRaw = parseFloat(document.getElementById("can-weight").value); var weightUnit = document.getElementById("can-weight-unit").value; var tolerance = document.getElementById("can-tolerance").value; var route = document.getElementById("can-route").value; var potency = parseFloat(document.getElementById("can-potency").value); var servingRaw = parseFloat(document.getElementById("can-serving").value); var servingUnit= document.getElementById("can-serving-unit").value;

// --- validation --- var errors = []; if (isNaN(weightRaw) || weightRaw 100) errors.push("Enter THC potency between 0.1 and 100 %."); if (isNaN(servingRaw)|| servingRaw " + errors.join("") + ""; resultDiv.style.display = "block"; return; }

// --- unit conversions --- var weightKg = (weightUnit === "lbs") ? weightRaw * 0.453592 : weightRaw; // serving → mg THC in the whole unit var servingMg = (servingUnit === "g") ? servingRaw * 1000 : servingRaw; var thcPerUnitMg = servingMg * (potency / 100);

// --- tolerance multiplier (relative to naïve baseline) --- var tolFactor = { naive: 1.0, low: 1.5, moderate: 2.5, high: 4.0 }[tolerance];

// --- route bioavailability & onset --- // Oral ~6-20 %, inhaled ~25-35 %, sublingual ~12-35 % // This calculator uses midpoint bioavailability to convert to effective dose var bioavail = { oral: 0.10, inhaled: 0.30, sublingual: 0.20 }[route]; var onsetMin = { oral: "30–120 min", inhaled: "2–10 min", sublingual: "15–45 min" }[route]; var durationH = { oral: "4–8 h", inhaled: "1–3 h", sublingual: "2–4 h" }[route];

// --- base dose formula --- // Conservative starting dose: 0.05 mg THC / kg body weight for naïve users // Scaled by tolerance factor and adjusted for bioavailability // Effective THC needed = baseDose_mg_per_kg × weightKg × tolFactor // Actual product dose = effectiveTHC / bioavailability var BASE_DOSE_MG_PER_KG = 0.05; // mg THC / kg (naïve baseline)

var effectiveTHC_mg = BASE_DOSE_MG_PER_KG * weightKg * tolFactor; var productDose_mg = effectiveTHC_mg / bioavail; // mg THC from product needed

// --- fraction of serving --- var fractionOfUnit = productDose_mg / thcPerUnitMg;

// --- max recommended cap (harm-reduction ceiling) --- var maxEffective = { naive: 2.5, low: 5, moderate: 10, high: 20 }[tolerance]; var capped = false; if (effectiveTHC_mg > maxEffective) { effectiveTHC_mg = maxEffective; productDose_mg = effectiveTHC_mg / bioavail; fractionOfUnit = productDose_mg / thcPerUnitMg; capped = true; }

// --- serving display --- var servingDisplay = ""; if (servingUnit === "g") { var grams = fractionOfUnit * servingRaw; servingDisplay = grams.toFixed(3) + " g (" + (productDose_mg).toFixed(2) + " mg THC from product)"; } else { var mgProduct = fractionOfUnit * servingRaw; servingDisplay = mgProduct.toFixed(2) + " mg of product (" + (productDose_mg).toFixed(2) + " mg THC from product)"; }

var cappedNote = capped
? "⚠ Dose capped at the recommended maximum for your tolerance level (" + maxEffective + " mg effective THC)."
"";

resultDiv.innerHTML = "Suggested Starting Dose" + "" + servingDisplay + "" + cappedNote + "" + "" + "Effective THC (absorbed)" + effectiveTHC_mg.toFixed(2) + " mg" + "Route bioavailability" + (bioavail*100).toFixed(0) + " %" + "Onset time" + onsetMin + "" + "Expected duration" + durationH + "" + "THC in full serving" + thcPerUnitMg.toFixed(2) + " mg" + "" + "⚠ This is an educational estimate only. Do not exceed this dose in a single session. Wait the full onset time before re-dosing.";

resultDiv.style.display = "block"; }

#### Formula

Step 1 – Effective THC needed (mg): Effective THC = 0.05 mg/kg × Body Weight (kg) × Tolerance Factor Tolerance factors: Naïve = 1.0 · Low = 1.5 · Moderate = 2.5 · High = 4.0

Step 2 – Product dose required (mg THC from product): Product THC dose = Effective THC ÷ Bioavailability Bioavailability: Oral ≈ 10 % · Inhaled ≈ 30 % · Sublingual ≈ 20 %

Step 3 – Fraction of serving: Fraction = Product THC dose ÷ (Serving size × Potency %)

Step 4 – Safety cap: Effective THC is capped at: Naïve 2.5 mg · Low 5 mg · Moderate 10 mg · High 20 mg.

#### Assumptions & References

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References

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