Cannabis Tincture Dosing Calculator: mg, mL, and Drops
Formula and steps to convert tincture total THC mg and bottle volume into mL and drops per dose, with examples and timing limits.
A cannabis dosing calculator in mg turns a potency number into milligrams of THC per serving. For products sold by weight, the formula is: THC mg = weight in grams × 1000 × (THC % ÷ 100). For oils and tinctures labeled in mg/mL, multiply the concentration by the volume you measure. For packaged edibles, divide the total mg in the package by the number of servings.
What you need before you calculate
- Potency from the label: THC percentage for flower or concentrate, mg per mL for oil, total mg per package for edibles.
- A scale that reads to 0.1 g, or a dosing syringe marked in 0.1 mL.
- The number of servings in the package or batch.
Calculate mg THC per serving
- Write down the total amount of product, in grams or milliliters.
- Convert grams to milligrams by multiplying by 1000. Skip this step if the label already reads mg or mg/mL.
- Turn the THC percentage into a decimal: 20% becomes 0.20.
- Multiply the milligrams by the decimal to get total THC in mg.
- Divide total THC by the number of servings to get mg per serving.
- Round to one decimal place and write the number on the container.
Worked example: flower and concentrate
Two grams of flower labeled at 22% THC: 2 × 1000 = 2000 mg of material, and 2000 × 0.22 = 440 mg total THC. Divided into 20 portions of 0.1 g, each portion carries about 22 mg. Inhaled flower does not deliver the full calculated number, because heat destroys part of the cannabinoid and some vapor or smoke is lost. Treat the result as an upper bound, not a delivered dose.
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Worked example: oil and tincture
A 30 mL bottle labeled 600 mg THC total: 600 ÷ 30 = 20 mg per mL. A 0.25 mL draw from a syringe is 5 mg. On a 1 mL syringe marked in 0.01 mL increments, each small mark equals 0.2 mg, which gives you room to adjust in small steps.
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Worked example: packaged edibles
A chocolate bar with 100 mg total THC and 10 scored squares: 100 ÷ 10 = 10 mg per square. For a 5 mg serving, cut the square in half along the score line. Scored pieces are more accurate than eyeballed chunks of an irregular shape. Check whether the label states total mg for the package or mg per piece, since both formats are in use.
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Pick a starting dose in mg
US public health agencies advise new consumers to start low and wait before adding more. A common starting range for edibles is 2.5 mg THC or less, with at least two hours before a second dose. Inhaled doses reach effect within minutes, so one or two puffs is the practical starting unit. The calculator gives you the size of one unit; it does not account for tolerance, body weight, or delivery method.
Reverse the math: mg back to percentage
- Multiply mg per serving by the number of servings to get total THC.
- Divide total THC by the product weight in milligrams.
- Multiply by 100 to express the result as a percentage.
Common errors
- Reading total mg per package as mg per serving, which multiplies the intended dose.
- Weighing wet flower and applying a potency figure measured on dry flower.
- Adding CBD mg to THC mg as if the two were the same cannabinoid.
- Redosing an edible before the first dose has peaked.
- Trusting an unlabeled black-market product, where the stated potency has no test behind it.