Cannabis Dosing Calculator in mg: Convert Potency to mg per Serving
Learn how a cannabis dosing calculator converts THC potency into mg per serving, with formulas and worked examples for flower, oil, and edibles.
A cannabis tincture dosing calculator turns label numbers into a dose. The math uses three inputs: bottle volume in milliliters (mL), total THC in milligrams (mg), and target dose in mg. Core formula: THC mg per mL = total THC mg ÷ bottle volume mL. Dose in mL = target dose mg ÷ THC mg per mL.
Cannabis Dosing Calculator in mg: Convert Potency to mg per Serving
Step 1: Find the concentration
Labels list concentration in one of two ways.
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- mg per mL: a 30 mL bottle labeled 10 mg/mL holds 300 mg THC.
- mg per bottle: a 30 mL bottle labeled 300 mg THC holds 10 mg/mL.
If the label lists total mg, divide by bottle volume. If the label lists mg per mL, multiply by volume to get total mg.
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Step 2: Convert your dose to milliliters
Example: 30 mL bottle, 600 mg THC. Concentration = 600 ÷ 30 = 20 mg/mL. For a 5 mg dose: 5 ÷ 20 = 0.25 mL.
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Example: 15 mL bottle, 150 mg THC. Concentration = 10 mg/mL. For a 10 mg dose: 1.0 mL.
Example: 10 mL bottle, 100 mg THC. Concentration = 10 mg/mL. For a 2.5 mg dose: 0.25 mL.
Step 3: Convert milliliters to drops
A 1 mL dropper holds about 20 drops. Drop size changes with dropper tip, liquid thickness, and angle. Calibrate your dropper before you rely on drop counts.
- Draw 1.0 mL of tincture into the dropper.
- Count drops into a small cup until the dropper is empty.
- Divide 1.0 mL by the drop count. That is mL per drop.
- Dose in drops = dose in mL ÷ mL per drop.
At 20 drops/mL, each drop is 0.05 mL. A 10 mg/mL tincture delivers 0.5 mg per drop. A 20 mg/mL tincture delivers 1.0 mg per drop.
Calculator inputs to verify
- Volume to the fill line, not the bottle size.
- Total THC mg, not total cannabinoids.
- THC versus THCA: labels may list both. THCA converts to THC with heat.
- Servings per bottle, if the label lists servings instead of mg.
Dose ranges and timing
Oral THC bioavailability is 6% to 20%. Onset is 30 to 90 minutes. Peak plasma levels arrive at 2 to 4 hours. A common starting dose is 1 to 2.5 mg THC. Wait 2 hours before a second dose.
Where the calculator stops
- Dropper marks vary by manufacturer.
- Ethanol evaporates and raises concentration over time.
- Food changes absorption.
- Liver enzyme activity changes clearance.
A calculator gives a number. It does not confirm label accuracy or your response to a dose.