Knowing how to calculate edible dosage is one of the most important skills for any cannabis cook. Whether you’re making brownies, gummies, or butter, getting the math right means consistent, safe, and enjoyable edibles every time. This guide walks you through the exact formula — from raw flower to milligrams per serving.
Why You Need to Know How to Calculate Edible Dosage
Without proper dosing math, homemade edibles are a guessing game. Too little and you feel nothing; too much and you’re in for an uncomfortable ride. Learning how to calculate edible dosage takes the guesswork out and gives you control over every batch. The formula is straightforward once you understand the steps.
How to Calculate Edible Dosage in 5 Steps
Step 1: Convert Grams to Milligrams
Start with the amount of cannabis you’re using. Multiply grams by 1,000 to get milligrams. For example, 10 grams of flower equals 10,000 milligrams of cannabis material.
Step 2: Calculate Total THC Content
Multiply your total milligrams by the THC percentage of your flower. If your cannabis is 20% THC, the formula is: 10,000 mg x 0.20 = 2,000 mg of THC. If you’re using concentrates like rosin at 75%, adjust accordingly: 1,000 mg x 0.75 = 750 mg of THC.
Step 3: Account for Decarb and Infusion Loss
During decarboxylation and infusion, you’ll lose approximately 20% of your THC. Multiply your THC total by 0.80 to get the adjusted amount: 2,000 mg x 0.80 = 1,600 mg of usable THC. This loss varies depending on your decarb method and infusion temperature.
Step 4: Determine Potency Per Volume
If you infused 1,600 mg of THC into 500 mL (2 cups) of butter, each cup contains 800 mg. If your recipe calls for one cup, you’re working with 800 mg total. Want less potency? Use half a cup of infused butter and half a cup of regular butter for 400 mg total.
Step 5: Divide by Number of Servings
This is the final step when learning how to calculate edible dosage. Divide your total THC by the number of servings. Using one cup of 800 mg butter to make 10 brownies: 800 mg / 10 = 80 mg per brownie.
Quick Reference: Edible Dosage Formula
- Total Cannabis (mg) = Grams x 1,000
- Total THC (mg) = Total Cannabis x THC %
- Adjusted THC (mg) = Total THC x 0.80 (accounting for 20% loss)
- THC per Cup = Adjusted THC / Cups of butter used
- THC per Serving = THC in recipe / Number of servings
Variables That Affect Your Dosage
- Decarb method: Oven decarb may lose more than mason jar in crockpot
- Infusion temperature: Higher temperatures can degrade more THC
- Infusion duration: Longer times may change efficiency
- Cannabis quality: Without exact THC percentage, numbers will be approximate
Frequently Asked Questions
How do I calculate edible dosage without knowing THC percentage?
You can’t get accurate numbers without knowing THC content. A common estimate for average flower is 15-20% THC, but this is a rough guess. Lab-tested flower gives the most reliable results.
Can I use this formula for concentrates?
Yes. Adjust the THC percentage to match your concentrate. For example, 1 gram of rosin at 75% THC = 750 mg of THC. The rest of the formula stays the same.
What is a good beginner edible dose?
Most experts recommend 5-10 mg of THC for beginners. Start low, wait 90 minutes, and increase gradually.
How do I reduce potency if my butter is too strong?
Mix infused butter with regular butter. Use half infused and half regular to cut potency in half.
References
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