Figuring out how strong your homemade edibles are is one of the most important and most misunderstood parts of cooking with cannabis. Unlike a commercial product printed with exact milligrams, a homemade brownie is the end of a long chain of estimates, and small losses at each step add up. You can still make a useful calculation to guide your dosing, as long as you understand that the result is an educated estimate, not a precise figure. This guide walks through the basic math, where uncertainty creeps in, and how to dose responsibly.
The Basic Estimation Method
The starting point is the THC content of your flower, usually expressed as a percentage on the label. To approximate the total milligrams of THC in a given amount of flower, you convert that flower's weight into milligrams and apply the percentage. For example, flower listed at a certain THC percentage contains that fraction of its weight as THC, so a gram of flower, which is one thousand milligrams, contains that percentage of one thousand milligrams as a rough ceiling.
Once you estimate the total THC in your starting flower, that same total is what gets distributed through your entire batch of infusion. If you infuse all of it into a quantity of butter or oil and then use that fat in a recipe, the total THC spreads across however many servings you make. Dividing your estimated total by the number of evenly portioned servings gives an approximate THC amount per serving. The whole calculation rests on even mixing and equal portions, which is why those steps matter so much.
Why the Number Is Only an Estimate
Several real-world factors mean your calculation will overstate the true potency, often substantially. The percentage on the label is a ceiling that assumes perfect conversion, but decarboxylation is never one hundred percent efficient. Decarbing matters not only for activating the THC but because how completely you do it directly affects the final strength; under-decarbing leaves potency on the table. Infusion is also imperfect, since not every cannabinoid migrates into the fat, and some is lost on the straining cloth and the cooking vessel.
On top of that, heat during both decarbing and cooking degrades some cannabinoids, and uneven mixing means individual servings can differ from the average even within one batch. This is why homemade potency is genuinely hard to predict and why two people following the same recipe can end up with noticeably different results. Treat your calculated milligram figure as the maximum possible strength and assume the real number is lower, but never count on exactly how much lower.
Dosing Responsibly
Because the math only approximates, your behavior matters more than your spreadsheet. The universal rule for edibles is to start with a low dose and wait at least 1 to 2 hours before taking more, since edibles can take 30 minutes to 2 hours to kick in and last for hours. This single habit protects you regardless of how accurate your calculation turned out to be. If your estimate suggests a serving is strong, eat only a fraction of it the first time.
When you find a comfortable dose for a particular batch, you can reasonably repeat it, but remember that a new batch resets everything, since different flower and slightly different technique change the outcome. Always label your edibles with your best estimate of the dose, store them away from children and pets, and treat shared edibles cautiously so everyone starts small. Effects vary widely between individuals, and this is general information, not medical advice; consult a professional if you have any health concerns.
Frequently Asked Questions
Is the THC percentage on my flower the exact amount I will get? No. That percentage is a ceiling that assumes perfect activation and extraction. In practice, imperfect decarboxylation, incomplete infusion, losses during straining, and heat degradation all lower the actual amount. Treat the calculated figure as the maximum and assume your edible is somewhat weaker than the math suggests.
How do I make doses consistent across a batch? Mix your infusion thoroughly into the recipe and divide the finished batch into clearly equal portions. Even mixing prevents some servings from being far stronger than others, and equal portioning keeps the dose per serving as uniform as possible, though the exact milligram count remains an estimate.
If my calculation says a serving is strong, what should I do? Eat only a small fraction of it the first time and wait at least 1 to 2 hours before having more. Because the calculation is only an estimate and edibles have a delayed onset, starting low and going slow is the safest way to learn how a particular batch actually affects you.