Weed to Butter Ratio
The right weed-to-butter ratio depends entirely on your target dose per serving. The chart below shows total THC, mg per tablespoon, and mg per teaspoon for every common ratio — based on 1 cup (227g) butter, 88% decarb efficiency, and 63% infusion efficiency.
Ratio Chart — 1 Cup (227g) Butter
| Cannabis | THC% | Total THC | Per Tbsp (14g) | Per Tsp (4.7g) | Strength |
|---|---|---|---|---|---|
| 3.5g | 15% | 290 mg | 18 mg | 6 mg | Very mild |
| 3.5g | 20% | 388 mg | 24 mg | 8 mg | Mild |
| 7g | 15% | 581 mg | 36 mg | 12 mg | Moderate |
| 7g | 20% | 775 mg | 48 mg | 16 mg | Standard |
| 7g | 25% | 969 mg | 60 mg | 20 mg | Strong |
| 10g | 20% | 1,108 mg | 68 mg | 23 mg | Strong |
| 14g | 20% | 1,551 mg | 96 mg | 32 mg | Very strong |
| 14g | 25% | 1,939 mg | 120 mg | 40 mg | Extremely strong |
Assumes 63% average infusion efficiency and 88% decarboxylation efficiency. Use the calculator for your exact numbers.
Get Your Exact Ratio
Enter your flower weight, THC%, and target serving dose — the calculator finds the perfect ratio for you.
Cannabutter Calculator →Full Wizard →FAQ
How much weed do I use for 1 cup of butter?
The standard ratio is 7–10g of decarboxylated flower per 1 cup (227g) of butter. This produces approximately 770–1,100 mg total THC at 20% flower potency, or 48–68 mg per tablespoon. For milder butter, use 3.5g per cup (about 24 mg/tbsp). For stronger butter, use 14g per cup (about 96 mg/tbsp).
What is the ratio of weed to butter for beginner edibles?
For beginner-friendly edibles, target 5–10 mg THC per serving. Using 3.5g of 20% flower per cup of butter gives about 24 mg/tbsp. If your recipe uses 2 tbsp butter per 16 servings, each serving gets about 3 mg — a good starting range. Use the BatchCraft calculator to reverse-engineer the exact ratio you need.
Does using more butter weaken cannabutter?
Yes. The same amount of cannabis infused into 2 cups of butter instead of 1 halves the potency per tablespoon. Total THC in the batch stays the same — it's just diluted across more fat. This is actually a useful technique: make potent butter first, then mix 1:1 with plain butter to hit your target dose per tablespoon.
How do I calculate mg per tablespoon of cannabutter?
Formula: (flower grams × THC% × 10 × 0.88 × 0.63) / butter grams × 14 = mg per tablespoon. Example: 7g × 20 × 10 × 0.88 × 0.63 = 776 mg total ÷ 227g butter × 14g per tbsp = 47.8 mg per tbsp. The BatchCraft calculator does this automatically — just enter your inputs.