Brew Kettle Size

BrewCo Brew Tools

Use this free brew kettle size calculator to work out the minimum kettle size needed for your batch, accounting for boil-off, trub loss, and headspace.

How to use it

  1. Enter your target batch size — the volume you want in the fermenter.
  2. Enter your planned boil time and your kettle's typical boil-off rate.
  3. Add your usual trub and deadspace losses.
  4. Read off the minimum kettle size needed, with headspace included.
Typical: 3–4L/hour on a standard vigorous boil.
— L
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Why add headspace on top of your pre-boil volume?

Wort foams up vigorously when it comes to the boil — without extra headspace above your pre-boil volume, you risk a boil-over that's messy and wastes valuable wort. 20% headspace is a safe standard margin for most home brew setups.

More free home brew calculators

Browse our range of brewing kettles and urns at BrewCo UK, Sowerby Bridge.