How to Make Cannabutter (Slow-and-Steady Method)

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My first cannabutter was a disaster. I was a college junior in a rented duplex with a screened-in back porch, a hand-me-down crockpot from my mom that had a cracked ceramic insert and only two settings, and a quarter-ounce of mid-shelf flower I had been saving for what I had decided would be the best batch of brownies anyone in our friend group had ever tasted. I dumped the flower straight in with two sticks of butter, set the crockpot to high, propped a paperback against the lid because the latch was broken, and went to a 2 p.m. lecture. I came home four hours later to a back porch that smelled like a burning lawn and a butter-cannabis sludge the color of pond water. I poured it through a paper coffee filter into a Mason jar because I did not own cheesecloth. I made the brownies anyway. They tasted like the inside of a hot mower deck. Half of us got slightly stoned. The other half ate two brownies and felt nothing because I had never decarbed the flower and most of the cannabinoids were still in their acid form, doing absolutely nothing.

I made cannabutter ten or twelve more times after that on the same broken crockpot before I learned the actual lesson. The lesson is patience. The more patient you are, the better it tastes, and the better it works. Slow and steady. That is the through-line of every good batch I have made since, and it is the through-line of this recipe.

Why you’ll love this cannabutter recipe

• Slow-cooker friendly. Set it on low for six to eight hours and walk away. No babysitting, no thermometer drift, no scorched butter.
• Forgiving on dosing math. The standard ratio (one cup butter to seven grams of flower) gives you predictable potency you can scale up or down without recalculating from scratch.
• Stores three weeks in the fridge, six months in the freezer. Make a double batch on a Sunday and you are stocked for the season.
• Drops into any baked recipe that calls for butter. Brownies, cookies, scones, garlic bread, scrambled eggs. If it normally uses butter, it can use this butter.
• Decarbs the flower in the same pot if you forget the oven step. Not ideal, but a six-hour low-and-slow infusion will partially activate the cannabinoids on its own.
• Dose-controlled by math, not guesswork. A test brownie is a kitchen sin. With a known potency on your flower, you know the milligram count per tablespoon before you bake.

Here’s how cannabutter actually works

There are three things happening when you make cannabutter, and skipping any of them is what makes a batch bad.

The first is decarboxylation. Raw cannabis flower contains cannabinoids in their acid form, primarily THCA and CBDA. THCA is not psychoactive. You can eat raw flower by the tablespoon and feel nothing. Heat converts the acid forms into the active forms (THC and CBD) by knocking a carboxyl group off the molecule. A 2020 kinetics study published in PMC tracked the conversion across temperatures from 80 to 145 Celsius and found that 110 to 120 Celsius (roughly 230 to 250 Fahrenheit) hits the sweet spot where THCA becomes THC efficiently without significant THC degrading further into CBN. That is why every good cannabutter recipe starts with a 30-to-40 minute bake at 240F before the butter ever touches the pot.

The second is extraction. Cannabinoids are fat-soluble. They bind to lipids and slip into the butter once everything is warm enough for the plant material to release them. Adding water to the slow cooker is not optional. The water layer pulls plant matter to the bottom, buffers the temperature so the butter never scorches, and rinses water-soluble bitters out of the mix. Without water you get a hot, dark, grassy butter. With water you get a clean golden one.

The third is heat control. Cannabinoids degrade fast above 250F. Research on cannabinoid thermal stability shows measurable losses of THC into CBN above that line, and CBN is sedating in a different and less predictable way. The slow cooker is the workhorse here because the LOW setting on most consumer models holds a stable 195 to 205F for hours. That is the temperature you want. A 2017 peer-reviewed paper on cannabinoid heat treatment documents the same window. Hotter is faster but worse. Cooler is slower but better.

One last thing. Strain selection matters less than people think for cooking. The terpene profile that drives the experience of smoking gets partially cooked off during a six-hour infusion. Pick by stated THC percentage and price, not by indica-versus-sativa. NIDA’s research on cannabis pharmacology notes that the indica-versus-sativa distinction is a lay-language convenience that does not map cleanly to cannabinoid effects in finished products.

Pro tips for the best cannabutter

Decarb first, every single time

Skipping this is the single most common reason a batch underperforms. Raw flower is mostly THCA. Heat for thirty to forty minutes at 240F on a parchment-lined baking sheet, stirring once at the halfway point, until the bud color shifts from bright spring green to a uniform toasted brown. Break the buds into pea-sized pieces before you bake; whole buds decarb unevenly because the inside never gets hot enough. The FDA’s guidance on cannabis products notes that potency varies widely between batches; decarb is the step that locks in whatever potency the flower had to begin with.

Keep the temperature under 200F

The high setting on a slow cooker is a trap. It runs hot enough (often above 250F) to start cooking the cannabinoids you just spent thirty minutes activating. Use the LOW setting and a kitchen thermometer the first time you make a batch on your specific cooker. Spot-check the liquid every hour for the first two hours. Once you have confirmed your slow cooker holds 195 to 205F on low, you can stop checking on subsequent batches.

Don’t squeeze the cheesecloth

This is the single biggest taste-killer in home cannabutter. When you wring out the cheesecloth at the end of the cook, you are forcing chlorophyll, water-soluble bitters, and pulverized plant fibers directly into the butter. The result is a green, gritty, hay-flavored block that ruins anything you bake with it. Hang the cheesecloth bag over a bowl and let gravity drain it for fifteen minutes. You leave a little butter behind in the cloth. That is fine. The butter you keep is cleaner and tastes worlds better.

Calculate your dose before you bake

The math is simple and worth doing. Seven grams of flower at 20 percent THC contains 7,000 mg x 0.20 = 1,400 mg of THC. Decarb is roughly 87 percent efficient at converting THCA to THC, so call it 1,218 mg of active THC. Infusion into butter loses another 20 to 30 percent to the strain step and to the residue left in the cheesecloth. Call it 850 to 950 mg of THC in your finished cup of butter (16 tablespoons). That works out to roughly 53 to 60 mg per tablespoon. If your brownie recipe makes 16 servings and uses one cup of butter, each brownie carries 53 to 60 mg of THC. CDC public health guidance on cannabis recommends starting with 2.5 to 5 mg of THC for new or low-tolerance consumers, so a 60 mg brownie is potentially a ten-dose brownie. Cut accordingly.

Salt only after the infusion, not before

Use unsalted butter for the infusion. Salt extracts moisture from the plant matter and can mute the cannabinoid yield. Add salt later in whatever recipe you are baking, not in the infusion pot. If you absolutely need salted cannabutter for a savory recipe, infuse unsalted butter and stir in a pinch of fine salt after you have lifted the solid butter disc off the water layer.

Patience tastes better

This is the lesson my crockpot on the back porch finally taught me. Six hours is the minimum on slow-cook low. Eight is ideal. The longer infusion is gentler on the butter and yields a smoother, less grassy flavor. The shortcut versions you see on cooking forums (two hours on high, double-boiler quick-infusions, butane-extraction cheats) all give you weaker, harsher butter and more wasted flower than the patient version. Slow and steady. Every time.

Variations and substitutions

• Coconut oil instead of butter. Same ratios, same time, same temperature. Coconut oil is the dairy-free standard and works in any recipe that calls for melted butter or vegetable oil. The saturated fat content is similar, so the cannabinoid yield is comparable.
• Ghee for clearer infusion and longer shelf life. Ghee is clarified butter with the milk solids removed. Use it the same way and you will get a slightly clearer, more shelf-stable cannafat that holds up better in dishes you cook at higher heat after the infusion is done.
• Lower or higher dose. Scale the flower linearly. 3.5 grams of 20 percent flower in one cup of butter cuts the per-tablespoon dose in half. 14 grams doubles it. The butter and water ratios stay the same regardless.
• Tincture as the no-butter alternative. If you do not want a butter-based product (or you want a faster, sublingual format that bypasses the digestive tract), an alcohol tincture is the move. Cannabis gummies are the other no-butter format we cover in detail on this site, and they use an emulsifier-and-water approach instead of fat-based extraction.

Storage, make-ahead, reheat, and freeze

• Make-ahead: Cannabutter improves on day two as the flavors mellow and the residual chlorophyll fades. Make it the day before you plan to bake.
• Store: Airtight glass jar in the fridge for up to three weeks. Glass holds up better than plastic against the slight grassiness in even a clean batch.
• Freeze: Portion tablespoons into a silicone ice cube tray, freeze solid, then bag the cubes. Six months at zero Fahrenheit. Potency stays stable; cannabinoids are not damaged by freezing.
• Reheat: Melt slowly over low stovetop heat or let it stand at room temperature for 20 minutes before baking. Never microwave. Microwaves create local hot spots that can degrade THC even if the bulk of the butter is still cold.

Common questions about making cannabutter at home

Do I have to decarb my flower first? Yes. Without decarboxylation the cannabinoids stay in their inactive acid form (THCA, CBDA) and the finished butter will be near-zero potency for psychoactive effects. The 30 to 40 minutes at 240F is non-negotiable.

Can I use a stovetop or double boiler instead of a slow cooker? Yes. Hold the pot at 180 to 200F for at least 4 hours, stirring every 30 minutes, and watch the temperature with a thermometer. The slow cooker is preferred only because it holds the temperature steady without supervision.

Why is my cannabutter green or bitter? One of two reasons. Either you squeezed the cheesecloth and forced chlorophyll into the butter, or your slow cooker ran above 220F and pushed water-soluble plant compounds into solution. The fix is to lower the temperature on your next batch and to never squeeze the strain bag.

How long does cannabutter actually last? Three weeks refrigerated in airtight glass, six months frozen at zero Fahrenheit. Frozen cannabutter does not lose potency; cannabinoids are stable at freezer temperatures and only degrade with exposure to heat, light, and oxygen.

Can I substitute coconut oil or ghee? Yes. Coconut oil is the standard dairy-free substitute and uses the same one-cup-to-seven-grams ratio. Ghee (clarified butter with milk solids removed) gives a clearer infusion and a longer shelf life. Both work in any recipe that calls for melted butter.

More cannabis recipes you’ll love

• Cannabis Hash Brownies (the classic recipe this cannabutter was made for)
• How to Make Cannabis Gummies (a butter-free alternative format with built-in dosing math)
• Cannabis-Infused Olive Oil (the savory pivot, drizzle-not-fry method, for pasta and salads)
• How to Make Cannabis Tincture (Mason-Jar Method) (the fast-onset alcohol-extract alternative; sublingual dosing in 15 to 30 minutes)

Slow-Cooker Cannabutter Recipe

The National Institute on Drug Abuse and the CDC both publish health guidance for cannabis consumers worth reading before you start dosing baked goods. Edibles peak later, last longer, and are easier to over-do than smoked flower at the same milligram count.

For more, see Cannabis Chocolate Chip Cookies. See also Cannabis Mac and Cheese.