betaCannaChef

Decarb

Decarb compared: oven, sous vide, air fryer

Every method here does the same job: hold the flower at a known temperature for a known time. They differ in how well they hold it, how much they smell, and how much attention they need — not in any trick of chemistry.

The short answer

Use the oven, with an oven thermometer. Switch to sous vide if the smell matters: it converts the same, 85–95% against the oven’s 85–95%. Buy a decarb appliance only if you decarb often. It converts the most, 90–98%, because it holds its temperature, not because it does anything an oven cannot.

Side by side

  • Oven, covered dish

    85–95%

    240 °F, 30–45 min

    Smell
    Strong. The oven vents into the kitchen.
    Attention
    A timer, and an oven thermometer to check the dial.
    Needs
    What you already have.

    Most batches. The standard for a reason.

  • Oven, low and slow

    80–92%

    220 °F, 60 min

    Smell
    Strong, for longer.
    Attention
    Same as the oven, twice as long.
    Needs
    What you already have.

    Flavor-led batches, where keeping aroma is worth a little conversion.

  • Sous vide

    85–95%

    203 °F, 90 min, sealed

    Smell
    Almost none while sealed.
    Attention
    Set it and leave it. The circulator holds the temperature.
    Needs
    An immersion circulator and bags rated for sous vide.

    No smell, and the same result every time.

  • Sealed jar in a pot of water

    85–95%

    203 °F, 90 min, sealed

    Smell
    Almost none while sealed.
    Attention
    High. A pot drifts, so it needs a thermometer and adjusting the whole time.
    Needs
    A canning jar, a pot and a thermometer.

    The sous vide result without the circulator, if you will stand over it.

  • Decarb appliance

    90–98%

    The unit's own cycle

    Smell
    Low. The chamber is enclosed.
    Attention
    Press a button.
    Needs
    A dedicated unit, bought for this.

    Frequent batches, where its tighter temperature control pays for itself.

  • Air fryer

    No data

    The oven schedule, if it can hold it

    Smell
    Strong. It vents like an oven.
    Attention
    Check it can hold 240 °F and confirm with a thermometer.
    Needs
    What some people already have.

    Nothing an oven does not do better, except a very small batch.

Conversion is the share of THCA that becomes THC, from the same figures the infusion calculator uses. The air fryer has none because nothing measured it, and this page does not make one up.

The oven's real problem is its thermostat

An oven holds its temperature by switching the heat on and off, so the flower sees a band around the dial rather than the dial. Rows on the decarb schedule are 10 to 20 °F apart, so an oven running that far off puts you on a different row from the one you chose.

An oven thermometer on the rack tells you where yours actually sits, and it is the cheapest improvement available to any method here. A covered dish evens out the rest.

The air fryer

Nothing in this site’s figures measures one, so it gets no numbers. What it is, though, is a small oven with a fan, so the oven schedule is the place to start.

  • Check it can hold 240 °F. Not every model goes that low.
  • Wrap the flower in a foil packet. Dry flower is light, and the fan will move it around the basket otherwise.
  • Trust a thermometer, not the dial, for the same reason as the oven.

Whatever you use

Longer is not safer. Past the peak, THC turns into CBN and does not come back, so set a timer and take it out. If smell is the deciding factor, sealing the decarb is most of the answer, and cooking without the smell covers the rest. The whole schedule is also on the printable dose chart.

Questions people ask

Is sous vide decarb better than the oven?
It converts the same, 85–95% against the oven's 85–95%. What it does better is smell and consistency: the flower is sealed, and a circulator holds its temperature where an oven cycles around it. If neither matters to you, the oven is fine.
Do I need a decarb machine?
No. It converts the most of anything here, 90–98%, because it holds temperature tightly, not because it does anything an oven cannot. It earns its price if you decarb often. For an occasional batch, an oven thermometer gets you most of the way.
Can I decarb in an air fryer?
Probably, if it can hold 240 °F, but nothing measures it, so this site gives it no figures. It is a small oven with a fan: use the oven schedule, wrap the flower in a foil packet so the fan cannot scatter it, and check the real temperature with an oven thermometer.
Why did my oven decarb come out weak?
Most often the oven runs cooler than its dial, so the flower never reached the temperature on the schedule. An oven thermometer on the rack settles it. The other common cause is not the decarb at all but the label: one that lists THCA is about 12% higher than the THC you can end up with.