Edible dosing calculator

Enter the flower weight, its THC percentage, how much butter or oil you infuse, how much of it goes into the recipe and how many servings you cut. The calculator returns the mg of THC per serving, per tablespoon and per teaspoon, or works backwards from the dose you want per serving.

How the calculation works

Active THC in the batch = flower grams × THC % × 1,000 × decarb efficiency × infusion transfer. The defaults assume 90% of the THCA turns into THC in the oven and 80% of it passes into the fat, a potency factor of 0.72.

Strength of the butter or oil (mg per ml) = active THC ÷ millilitres infused. THC per serving = mg per ml × millilitres used in the recipe ÷ servings. One tablespoon is 14.79 ml, one teaspoon 4.93 ml.

Worked example

• 3.5 g of flower at 15% THC: 3.5 × 0.15 × 1,000 × 0.72 = 378 mg of active THC.
• Infused into 240 ml (one cup) of butter: 1.58 mg per ml, about 23 mg per tablespoon and 8 mg per teaspoon.
• 60 ml of that butter in a batch of 24 cookies: 94.5 mg in the recipe, about 3.9 mg per cookie.

Working backwards from the dose you want

For 24 servings at 5 mg each the recipe needs 120 mg of THC. If the recipe takes 60 ml of butter, the butter must hold 2 mg per ml, so a 240 ml batch needs 480 mg of active THC: about 4.4 g of flower at 15% THC.

Dose bands

• Up to 2.5 mg: micro dose
• 2.5 to 5 mg: gentle, the usual first dose
• 5 to 15 mg: moderate
• 15 to 30 mg: strong
• Over 30 mg: heavy

Frequently asked questions

How strong is homemade cannabutter?

It depends on the flower and the amount of butter. 7 g of flower at 20% THC infused into 240 ml of butter holds about 1,000 mg of THC: roughly 4.2 mg per ml or 62 mg per tablespoon. A recipe that uses half of that butter for 12 servings lands near 42 mg each, a heavy dose, so use less butter per recipe or cut more servings.

What dose should a beginner take?

Start with 2.5 to 5 mg of THC and wait two hours before taking more. Edibles act later and last longer than smoking.

How exact is the result?

It is an estimate. Home decarboxylation and infusion vary from batch to batch; only a lab test measures a batch exactly.

What do decarb efficiency and infusion transfer mean?

Decarb efficiency is the share of THCA that turns into active THC in the oven (0.9 by default). Infusion transfer is the share that ends up in the butter or oil (0.8 by default). Both can be changed under the advanced settings.

Estimate only, not medical advice. Infusion calculator · Dosing guides · Recipes with dosing