How to Decarb Cannabis (Decarboxylation)

Quick answer: Break your cannabis into small pieces, spread it on a parchment-lined tray, and bake at 240°F (115°C) for 40 minutes, stirring once halfway. It's done when it's golden-brown and crumbly. This converts the raw THCA in your flower into active THC — skip it and your edibles barely work.

What is decarboxylation, and why it matters

Raw cannabis doesn't actually contain much THC. It contains THCA — an acidic, non-intoxicating form. Heat knocks a molecule off the THCA and turns it into THC, the part that actually does something when you eat it. That conversion is called decarboxylation, or "decarb" for short.

When you smoke or vape, the flame decarbs your flower instantly. But in edibles there's no flame — so if you skip this step and toss raw flower straight into butter, most of it never activates and you're left wondering why nothing happened. Decarbing first is the single biggest reason home edibles succeed or fail.

The temperature and time (and why low-and-slow wins)

The sweet spot for flower is 240°F (115°C) for 40–45 minutes. It's a balance:

• Too cool or too short → not enough THCA converts, and your edibles come out weak.
• Too hot or too long → you start burning off the THC you just activated (and killing the terpenes that give flavor and effect).

Low-and-slow protects potency. Every oven runs a little hot or cold, so an inexpensive oven thermometer is worth it — guessing your oven temperature is the most common way people wreck a decarb. See the Vetted Setup for the thermometer and decarb tools we'd actually buy.

Step-by-step: the oven method

1. Preheat your oven to 240°F (115°C) and let it fully come up to temperature.
2. Break up your flower into small, pea-sized pieces by hand. Don't grind it to powder — that scorches. Chunky is better.
3. Spread it in a single, even layer on a parchment-lined baking tray. A lidded, oven-safe decarb box traps the smell and holds heat more evenly if you have one.
4. Bake 40–45 minutes, gently stirring or shaking the tray once around the halfway mark so it heats evenly.
5. Check the color: it should go from bright green to a light golden-brown and feel dry and crumbly. Then let it cool before you infuse.

Common decarb mistakes

• Grinding too fine — powder burns and smells stronger. Keep pieces chunky.
• Trusting the dial — oven dials lie. Use a thermometer.
• Cranking the heat to save time — high heat destroys the THC you're trying to keep.
• Skipping it entirely for flower — the #1 cause of "my edibles did nothing."

After you decarb: know your dose

Once your flower is activated, the next question is how strong your batch will be. Run your numbers through the free dosage calculator — it estimates the mg per serving so you can start low and go slow. Then pick your infusion: cannabutter, cannabis oil, or a tincture.

Decarb FAQ