How to Decarb at Home: Temperature Chart & Methods

A representative home decarb setup (illustration).

What decarboxylation actually does

Cannabis produces its cannabinoids as acidic precursors: THCA and CBDA rather than THC and CBD. Heat removes the carboxyl group from these molecules, which is what makes them active when you eat them. Smoking does this instantly; for edibles, tinctures, and infused oils you have to do it deliberately - and the temperature and time you pick decide how much of the conversion you actually get. That part is measured, not folklore: a 2016 kinetics study followed THCA-A, CBDA, and CBGA disappearing at fixed temperatures in a vacuum oven, and a 2022 review of acidic cannabinoid decarboxylation summarizes the same reaction end to end.

Decarb temperature and time at a glance

Cannabinoid	Target	Temperature	Time
THCA → THC (high THC flower)	Full activation	240°F / 115°C	30-40 min
THCA → THC (terpene preservation)	Balanced	230°F / 110°C	40-50 min
CBDA → CBD (hemp, high CBD)	Full activation	240°F / 115°C	40-60 min
Any (low and slow)	Maximum flavor	200°F / 95°C	60-90 min

Thin, even layer on parchment with an oven thermometer (illustration).

For the full chart - per-cannabinoid rates, material-by-material settings, and the research each number comes from - see our decarb temperature chart.

Ovens are the biggest source of failed decarbs. A dial set to 240°F can cycle between roughly 215°F and 265°F, so check with an oven thermometer and expect to stir at least once to even out hot spots.

That drift is the one variable a preset appliance removes: the ÉCRU Herb Decarboxylator Green 2oz runs one fixed heat cycle in a sealed canister instead of an element that turns on and off all evening.

Why decarb time matters as much as temperature

Under-done decarboxylation leaves a large fraction of the THCA unconverted, so the infusion is weaker than the amount of flower suggests. Over-done is just as common: at 300°F+ (150°C+) the THC itself starts degrading into CBN, which swaps potency for a heavy, sedative effect and a burnt taste. Hold the temperature steady in the 230-250°F band and let time do the work.

The published kinetics say why the band is this narrow. In the same 2016 study, THCA-A approached zero in 30 minutes at 110°C (230°F), 9 minutes at 130°C (266°F), and 6 minutes at 145°C (293°F) - and the Δ9-THC formed at 145°C peaked after 5-10 minutes and then declined. Extra heat buys minutes and costs potency.

After the decarb: infusing

Decarbed flower, golden-brown and crumbly (illustration; results vary).

Once the flower is golden brown and cooled, it is ready for butter or oil. Decarbed cannabis infuses efficiently because the cannabinoids are already activated - a low, steady infusion temperature (160-190°F / 70-90°C) for 1-2 hours is enough to pull them into the fat. The ÉCRU 2 in 1 Decarboxylator & Infuser 3oz runs both cycles in the same canister, so nothing is transferred or lost between steps. The full butter batch - quantities, the water rinse, and how to strain without pressing - is in our cannabutter recipe (machine method).

A 2-in-1 decarboxylator set up for the infusion step (illustration).

What your batch is actually worth

The reaction has an arithmetic ceiling. The carboxyl group leaves as CO2, so converted material weighs about 12% less than the acid it started from: by molar mass, THCA becomes THC at a factor of 0.877. A lab report listing 18% THCA therefore caps out near 15.8% THC - before heat, before degradation, before your oven drifts. Grams × percent × 0.877 is the most your butter can possibly contain; the decarb calculator runs that figure with your starting percentage and the published conversion rates at your temperature and time.

Treat the result like the concentrated product it is. The FDA's 2022 advisory on THC food products warns that accidental ingestion can cause serious adverse events, especially in children. Date the jar, store it out of reach, and never in packaging that reads like the snacks next to it.