How to Make Weed Butter — Decarb, Infuse, Strain

The Baymard Institute's analysis of online recipe engagement found that procedural content with explicit numbered steps converts readers to action at 3.2× the rate of narrative-style instructions. And nowhere is that gap more pronounced than in cannabis infusion guides. Most tutorials gloss over decarboxylation entirely or treat it as optional, which is why home cooks waste premium flower on underpowered edibles. Proper cannabutter isn't about tossing ground flower into melted butter. It's about controlled thermal conversion of cannabinoids followed by lipid extraction at temperatures that preserve potency without degrading terpenes.

Our team has reviewed hundreds of infusion protocols across state-licensed edibles manufacturers and home cannabis communities. The brands that consistently produce shelf-stable, accurately dosed products follow a three-stage process: decarboxylation at 240°F for 40 minutes, low-temperature infusion at 160–180°F for 2–3 hours, and mechanical separation using cheesecloth or fine-mesh straining.

How do you make weed butter at home?

To make weed butter, you decarboxylate 7–10 grams of ground cannabis at 240°F for 40 minutes, simmer the decarbed flower in 1 cup of melted unsalted butter at 160–180°F for 2–3 hours, then strain the mixture through cheesecloth into a container and refrigerate until solidified. This three-stage process. Decarb, infuse, strain. Converts inactive THCA into bioavailable THC and binds cannabinoids to milk fat for consistent edible dosing. Skipping decarboxylation reduces potency by 60–80% because raw THCA does not produce psychoactive effects.

Home infusion isn't mysterious. The challenge is that cannabis butter sits at the intersection of chemistry and cooking, and neither discipline alone gives you the full picture. This guide covers the exact temperature windows that preserve potency, the infusion time required for complete lipid binding, and the straining method that maximizes yield without introducing plant particulate into your final product.

Step 1: Decarboxylate Cannabis at 240°F for 40 Minutes

Decarboxylation is non-negotiable. Raw cannabis flower contains THCA (tetrahydrocannabinolic acid), which produces zero psychoactive effects until heat removes the carboxyl group and converts it into THC. This conversion begins at 220°F and peaks at 240°F. Higher temperatures degrade THC into CBN (a sedative cannabinoid), and lower temperatures require prohibitively long exposure times. A 2016 study published in the Journal of Chromatography found that 240°F for 40 minutes achieves 97% THCA-to-THC conversion with minimal CBN formation.

Preheat your oven to 240°F. Break 7–10 grams of cannabis flower into small pieces using your hands or a grinder set to coarse grind. Powder-fine grinds increase surface area but also introduce more chlorophyll into the butter during infusion. Spread the ground flower in a single layer on a parchment-lined baking sheet, cover the sheet with aluminum foil to contain odor and prevent terpene volatilization, and bake for 40 minutes. The flower will darken slightly from bright green to olive-brown. This color shift is visual confirmation that decarboxylation occurred.

Odor management matters. Decarboxylation releases terpenes (the aromatic compounds in cannabis), which can permeate an entire home. If discretion is a concern, place the foil-covered baking sheet inside an oven bag designed for turkey roasting. This creates a second containment layer that reduces airborne smell by approximately 70%. After 40 minutes, remove the sheet and let it cool completely before opening the foil.

Step 2: Infuse Decarbed Flower in Butter at 160–180°F for 2–3 Hours

Infusion binds fat-soluble cannabinoids to the milk fat in butter through mechanical agitation and prolonged heat exposure. The target temperature range is 160–180°F. Below 160°F, the infusion rate slows to the point where 6+ hour cook times are required; above 200°F, THC begins to degrade into CBN at an accelerated rate. The consistent benchmark is 2.5 hours at 170°F for complete cannabinoid transfer from plant material to lipid.

Melt 1 cup (2 sticks) of unsalted butter in a small saucepan over low heat. Add the fully cooled decarboxylated flower and 1/4 cup of water. The water prevents the butter from scorching by keeping the mixture slightly below butter's smoke point, and it separates during refrigeration, carrying water-soluble impurities like chlorophyll with it. Stir the mixture to ensure even distribution, then maintain the temperature between 160–180°F using a candy thermometer.

Simmer for 2–3 hours, stirring every 15–20 minutes. You're looking for gentle bubbling. Not a rolling boil, which indicates the temperature is too high. The mixture will darken from pale yellow to deep amber as cannabinoids transfer into the butter. If the butter starts to brown or smell burnt, remove it from heat immediately and let it cool 5 minutes before resuming at a lower temperature.

Step 3: Strain Through Cheesecloth and Refrigerate Until Solid

Straining separates cannabinoid-rich butter from spent plant material, which contributes nothing but texture and bitterness to the final product. The goal is maximum butter recovery with zero particulate. Cheesecloth is the standard straining medium because it allows butter to pass while catching flower fragments, but mesh grain-straining bags work identically and can be reused after washing.

Place 3–4 layers of cheesecloth over a heat-safe bowl or glass measuring cup. Pour the hot butter mixture through the cheesecloth slowly. Once all liquid has passed through, gather the edges of the cheesecloth and twist to squeeze the remaining butter from the plant material. This final squeeze recovers an additional 10–15% of the total butter volume. Discard the spent flower.

Refrigerate the strained butter for 4–6 hours until fully solidified. The butter will separate into two distinct layers: cannabutter on top (solid, amber-colored) and water on the bottom (liquid, dark green). Use a knife to lift the solidified butter layer off the water, then discard the water. The cannabutter is now ready for use in any recipe calling for butter. It stores in an airtight container in the refrigerator for up to 6 weeks or in the freezer for 6 months.

How to Make Weed Butter: Process Comparison

Key Takeaways

• Decarboxylation at 240°F for 40 minutes converts inactive THCA into psychoactive THC at 97% efficiency. Skipping this step reduces edible potency by 60–80%.
• Infusion temperature must stay between 160–180°F for 2–3 hours; above 200°F, THC degrades into CBN, and below 160°F, extraction slows to the point where overnight cook times are required.
• Adding 1/4 cup water during infusion prevents butter from scorching and carries chlorophyll and plant waxes into the discarded water layer after refrigeration, improving flavor.
• One cup of butter infused with 7–10 grams of 20% THC flower yields approximately 1,400–2,000mg total THC, translating to 70–100mg per tablespoon when evenly distributed.
• Cannabutter stores in the refrigerator for 6 weeks or the freezer for 6 months without significant potency loss. Freezing does not degrade cannabinoids.

What If: Weed Butter Scenarios

What If My Butter Smells Burnt After Infusion?

Discard it. Burnt butter indicates temperatures exceeded 220°F for long enough to trigger the Maillard reaction, which breaks down milk proteins and creates acrid compounds that cannot be masked in baking. The same heat that burnt the butter also degraded THC into CBN, meaning the batch is both unpalatable and lower potency than intended. To prevent this in future batches, use a candy thermometer to monitor temperature continuously and remove the pan from heat the moment you smell browning. Finishing at lower temperature for longer is always preferable to finishing faster at high temperature.

What If I Don't Have a Thermometer to Monitor Infusion Temperature?

Use visual cues. Butter held at 160–180°F will show tiny bubbles rising slowly from the bottom of the pan. Not a rolling boil, but not completely still either. If you see no bubbles at all, increase heat slightly; if the butter is bubbling rapidly or spattering, reduce heat immediately. Another proxy: if you can hold your hand 6 inches above the pan for 5 seconds without discomfort, the temperature is likely below 160°F. The $12 cost of a candy thermometer is worth it for repeatability.

What If I Want to Make Weed Butter with Trim or Shake Instead of Flower?

Double the plant material. Trim and shake typically contain 5–10% THC versus 15–25% in premium flower, so you'll need 14–20 grams of trim to match the potency of 7–10 grams of flower. Decarboxylate at the same temperature and time (240°F for 40 minutes), but expect the final butter to have a stronger plant taste because trim includes more leaf material. If flavor is a priority, consider filtering the strained butter a second time through activated carbon. This removes chlorophyll and improves taste at the cost of slightly reducing cannabinoid content.

The Unvarnished Truth About Cannabutter Potency

Here's the honest answer: most home cooks overestimate the THC content of their cannabutter by 30–50% because they assume perfect efficiency and ignore cannabinoid loss during decarboxylation, infusion, and straining. If you start with 10 grams of 20% THC flower (2,000mg total THC), expect to retain 1,600–1,800mg in the final butter after accounting for incomplete extraction and material left behind in the cheesecloth. That puts your per-tablespoon dose at 80–90mg, not the 125mg you'd calculate assuming zero loss. Edibles that feel weaker than expected usually reflect accurate dosing of lower-potency butter, not user tolerance.

The brands we work with at SeaWeed Delivery. Including Raw Garden's live resin products and our Seaweed Flower collection. Are lab-tested to confirm cannabinoid content within ±10% accuracy. Home infusion offers no such verification unless you send a sample to a state-licensed lab for testing, which costs $50–$100 per sample. If you're making edibles for personal use, start with a conservative dose estimate (assume 70% extraction efficiency) and increase gradually across multiple batches until you dial in the actual potency through trial and error.

Making cannabutter properly. With a thermometer, timer, and attention to detail. Is not difficult, but it is exacting. The difference between doing it right and doing it wrong is the difference between consistent 10mg brownies and mystery-dose brownies that either do nothing or send someone to the couch for 6 hours. If you value predictability, follow the temperatures and times specified here without deviation. If you value convenience over precision, you'll get functional butter, but you won't get repeatable results batch to batch.