The Dosing Math Every Home Edibles Cook Gets Wrong

Most people who make cannabis edibles at home dose by feel. They eyeball the flower, follow a recipe they found online, and hope for the best. Sometimes it works. Often it doesn't — the batch is too weak, too strong, or wildly inconsistent from one brownie to the next.

This isn't a skill problem. It's a math problem. And the math isn't hard once you know what you're actually calculating.

Here's what most home cooks miss.

The Number on the Label Is Not What You Get

Say you pick up an eighth of flower with 22% THC on the label. You might assume that a gram of that flower contains 220mg of THC. It doesn't — at least not yet.

In the live plant, THC doesn't exist in its active form. It exists as THCA — a non-intoxicating acid compound. THCA only converts to THC through heat, in a process called decarboxylation. That conversion isn't perfect. You lose roughly 12% in the process, which means the real conversion factor is about 0.877.

So the formula looks like this: mg THC per gram = % THC × 10 × 0.877

For 22% flower: 22 × 10 × 0.877 = 193mg per gram — not 220.

That gap matters. If you're making a batch of 20 brownies and you're off by 27mg per gram across 3.5 grams of flower, you're off by nearly 95mg total — almost 5mg per brownie. Enough to turn a mild experience into an overwhelming one, or a strong batch into a disappointing one.

The Full Dosing Formula

Once you've accounted for decarboxylation, the rest is straightforward:

(grams of cannabis × % THC × 10 × 0.877) ÷ number of servings = mg THC per serving

Walk through a real example. You're making a batch of 16 cookies using 3.5g of flower at 20% THC.

3.5 × 20 × 10 × 0.877 = 614mg total THC. 614 ÷ 16 = 38mg per cookie.

That's a strong cookie. A beginning user might expect 5–10mg. An experienced user comfortable with edibles might target 15–25mg. At 38mg per cookie, even seasoned consumers should eat half.

Running this math before you bake tells you exactly what you're making — and lets you adjust the recipe before anyone eats anything.

Why Standard Serving Sizes Matter

The cannabis industry's standard serving size is 5mg THC for beginners and 10mg as a general reference point. These aren't arbitrary — they're based on clinical research and decades of consumer experience.

The practical rule most experienced home cooks use is the dose-down rule: start with the dose you want, not the dose you think you can handle. Edibles take 45 minutes to 2 hours to hit, and the metabolic pathway is completely different from inhaled cannabis. The liver converts THC into 11-hydroxy-THC, which is more potent, longer-lasting, and hits differently than smoked flower. People who regularly smoke cannabis are frequently surprised by edibles at equivalent doses because of this.

If you've never had an edible, 5mg is a reasonable starting point. If you have experience, 10–15mg. Going higher than 25mg before you know how you respond is how people have bad experiences.

The Batch Consistency Problem

Even when you run the math correctly, batches can still be inconsistent — not because your math was wrong, but because of how cannabis infuses into fat.

THC binds to fat molecules, and fat distribution in a baked good isn't perfectly even. The corner brownie and the center brownie may have different concentrations even if you mixed the batter thoroughly. This is especially true with butter-based recipes.

Three things that help: Mix thoroughly — after incorporating your infused butter or oil, mix more than you think you need to. Use lecithin — sunflower or soy lecithin is an emulsifier that helps THC bind more uniformly throughout a recipe; a teaspoon per cup of infused fat makes a measurable difference in both potency and consistency. Cut precisely — if a batch is supposed to be 16 servings, cut 16 equal pieces.

The Bigger Picture

Most problems people have with edibles — inconsistent results, accidental overconsumption, batches that don't work — trace back to one of three things: imprecise decarboxylation, skipping the dosing math, or inconsistent mixing. None of these are complicated to fix once you understand the science behind them.

Doing the math changes that. It takes an extra five minutes before you start, and it's the difference between a craft and a guessing game.

The CraftPath Academy Edibles Mastery Program covers dosing math, decarboxylation methods, infusion techniques, and 25+ original recipes — with the science behind all of it. If you want to go deeper, the course is here: https://www.craftpathacademy.com/products/courses/edibles-mastery-program

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