How to Make Perfect Cannabutter: The Complete Step-by-Step Guide

Cannabutter is the foundation of cannabis cooking. Master this single recipe and you can infuse brownies, cookies, pasta sauces, toast, or virtually anything else that uses butter. The process is straightforward — decarboxylate your cannabis, infuse it into butter, strain, and store — but the details matter enormously for potency, flavor, and consistency.

Step 1: Calculate Your Dose

Before you start cooking, determine how strong you want your butter. The math is simple but critical.

The formula: If your cannabis tests at 20% THC, one gram contains 200mg of THC. After decarboxylation losses (approximately 10-15%) and infusion efficiency (approximately 80-90%), expect to recover about 150-170mg of THC per gram of flower.

For a standard batch: 7 grams (quarter ounce) of 20% THC flower infused into 1 cup (2 sticks) of butter yields approximately 1,050-1,190mg total THC. Divided across the cup (16 tablespoons), each tablespoon contains roughly 65-75mg THC.

For a milder batch: Use 3.5 grams (eighth) per cup of butter for approximately 35mg per tablespoon — more manageable for dosing beginners.

Write your calculations down. Knowing the approximate THC per tablespoon is essential for dosing the finished product.

Step 2: Decarboxylation

Raw cannabis contains THCA, which is not psychoactive. Heat converts THCA to THC through decarboxylation — the most important step in the entire process.

Method:

1. Preheat oven to 240°F (115°C). This temperature maximizes THC conversion while minimizing degradation.
2. Break cannabis into small, roughly even pieces (don’t grind to powder — you’ll strain it later).
3. Spread evenly on a parchment-lined baking sheet.
4. Bake for 40 minutes, checking at 30 minutes. The cannabis should turn from green to a golden-brown color and feel dry to the touch.
5. Remove and let cool for 10 minutes.

Common mistakes: Temperature too high (above 300°F degrades THC rapidly), grinding too fine (creates plant material that’s hard to strain), and under-decarbing (leaving THCA unconverted, resulting in weak butter).

Step 3: Infusion

You have three methods, ranging from simple to precise.

Stovetop method (easiest):

1. Melt 1 cup of unsalted butter with 1 cup of water in a saucepan over low heat.
2. Add decarboxylated cannabis once butter is fully melted.
3. Maintain a gentle simmer (never a boil) at 160-180°F for 2-3 hours, stirring every 20-30 minutes.
4. The water prevents the butter from scorching and will separate during cooling.

Slow cooker method (most forgiving):

1. Combine butter, water, and decarboxylated cannabis in a slow cooker set to LOW.
2. Cook for 4-6 hours, stirring occasionally.
3. The slow cooker’s gentle, consistent heat makes overcooking nearly impossible.

Sous vide method (most precise):

1. Combine butter and decarboxylated cannabis in a vacuum-sealed bag.
2. Submerge in a water bath at 185°F for 4 hours.
3. No water needed, no monitoring required, and the sealed bag eliminates odor.

For all methods, the key is maintaining temperature between 160-185°F. THC begins degrading into CBN (a sedative cannabinoid) above 200°F. Below 150°F, the infusion is inefficient. A kitchen thermometer is a worthwhile $10 investment.

Step 4: Straining

1. Set a fine mesh strainer or cheesecloth over a glass container.
2. Pour the butter mixture through, letting gravity do the work.
3. Do not squeeze the cheesecloth. Squeezing extracts chlorophyll and plant material that make the butter taste harsh and green. Let it drip naturally for 15-20 minutes. You’ll lose a small amount of butter, but the flavor and quality improvement is worth it.
4. If you used the water method, refrigerate the strained mixture for 4-6 hours. The butter will solidify on top and the water will settle below. Lift the solid butter disk and discard the water.

Step 5: Storage

Cannabutter stores well. Refrigerated in an airtight container, it lasts 2-3 weeks. Frozen, it lasts 6 months or more. Divide into measured portions (ice cube trays work perfectly — each cube is roughly 1 tablespoon) for easy use in recipes.

Label everything with the date and approximate THC content per tablespoon. Future you will be grateful for this documentation.

Using Your Cannabutter

Substitution: Replace regular butter 1:1 in any recipe. If a brownie recipe calls for half a cup of butter, use half a cup of cannabutter. The THC per serving equals the THC per tablespoon multiplied by the number of tablespoons used, divided by the number of servings.

Temperature awareness: THC degrades at temperatures above 340°F. Most baking occurs at 325-350°F, which is fine — the internal temperature of baked goods rarely exceeds 250°F even when the oven is hotter. Deep frying and high-heat sautéing will degrade potency.

Flavor management: Cannabutter has a distinctly herbal taste. Recipes with strong flavors — chocolate, peanut butter, garlic, strong spices — mask the cannabis taste effectively. Delicately flavored recipes will have a noticeable herbal note.

Start with less. When trying a new batch, eat a small portion (half a serving) and wait two full hours before consuming more. Edible onset varies enormously based on metabolism, stomach contents, and individual factors. The classic edible mistake is eating more because “it’s not working” — and then having both doses hit simultaneously.