Mead Priming Sugar Calculator

Mead always holds some dissolved CO2 left over from fermentation, and how much it holds depends on temperature. Cold mead retains more CO2; warm mead retains less. That residual amount counts toward your carbonation target, so the calculator subtracts it before working out how much sugar to add.

This is why the same target carbonation needs more priming sugar for warm mead than for cold mead. Enter the actual temperature at bottling time — not fridge temperature if the mead has warmed up — for an accurate result.

Residual CO2 at 68°F ≈ 0.86 vol

CO2 to add ≈ 2.4 − 0.86 ≈ 1.54 vol

Dextrose ≈ 18.9 L × 1.54 × 4.01 ≈ 117 g

Both dextrose (corn sugar) and table sugar (sucrose) carbonate mead reliably. The difference is potency by weight: sucrose is slightly more fermentable, so you need a little less of it than dextrose for the same carbonation. The calculator gives both figures so you can use whichever you have on hand.

Neither choice meaningfully changes flavour at priming quantities, since the yeast consumes the sugar entirely and turns it into CO2. Pick based on availability and measure by weight, not volume, for accuracy.

Only bottle-condition mead that has reached a stable final gravity — confirm it with repeat hydrometer readings a few days apart. Priming a mead that is still fermenting stacks new pressure on top of unfinished fermentation and risks over-carbonation or burst bottles.

Match the bottle to the carbonation level. Above roughly 2.5 volumes, use pressure-rated bottles such as Champagne bottles or heavy beer bottles with proper closures. Store carbonating bottles somewhere contained and out of the way while they condition.