Here’s the exact mental math I use every single batch so you can stop guessing and start nailing perfect doses every time.
Step 1: How much THC is in your flower?
Rule of thumb that’s stupidly accurate:
Take the percentage on the label and knock off 10–12 %.
Example:
- Label says 24 % THC → real world = 21–22 % usable THCA.
Step 2: Grams to milligrams
1 gram of flower = label % × 10 = starting mg
24 % flower → 1 g = 240 mg THCA (before cooking)
Step 3: The three losses you will always have
- Decarb loss: ~12 % gone → 240 mg becomes ~210 mg
- Infusion loss (butter/oil never grabs 100 %): ~15–20 % stays in the weed → 210 mg becomes ~170–180 mg
- Final transfer loss (some sticks to pots, spoons, paranoia): ~5–10 %
End result: 1 gram of 24 % flower reliably delivers 150–160 mg active THC into your final recipe.
Dead-simple flower-to-edible cheat sheet (memorize this)
- 20 % flower → 1 g = 120–130 mg final
- 22 % flower → 1 g = 135–145 mg final
- 24 % flower → 1 g = 150–160 mg final
- 26 % flower → 1 g = 165–175 mg final
- 28–30 % fire → 1 g = 190–210 mg final
Step 4: Batch math made stupid easy
You want 10 mg gummies and 30 gummies per batch = 300 mg total needed.
Pick your flower strength and reverse it:
- 20–21 % flower → use ~2.3–2.5 g
- 23–24 % flower → use exactly 2.0 g
- 26–27 % flower → use 1.7–1.8 g
- 30 % monster → 1.4–1.5 g is plenty
Step 5: The “I’m high and need to dose right now” shortcut
Weigh your flower in grams → multiply by 150 → that’s your safe final mg number.
1.8 g × 150 = 270 mg total batch. Divide by however many gummies or brownies you’re making. Done.
Pro moves that squeeze out extra potency
- Grind medium-fine (not powder) before decarb → +5–10 mg
- Infuse at 170–180 °F for 3+ hours → +10–15 mg
- Use lecithin (1 tsp per stick of butter or cup of oil) → +10–20 % absorption
- Double-infuse (reuse the weed in cream after butter) → basically free +20–40 mg
That’s literally it. No calculator needed once you burn these numbers into your brain.
Buy decent flower, weigh it once, multiply by 150, divide by pieces. Every batch comes out perfect, every gummy hits exactly the same, and you never accidentally make 400 mg “whoops” brownies again.