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Boil Off Rate Calculator
A great tool for calculating boil off rates! Now you will end your boils with the perfect volume every time.
Every brewers system is a little different and dialing in your system is key to making repeatable results. In regards to boil off rates, it is a function of the surface area of wort (kettle diameter), boil vigor (rolling boil) and atmospheric conditions. With this calculator you can figure out the percentage of boil off to expect on your system.
Pre-Boil Volume: The volume of liquid you originally started with in your kettle.
Post-Boil Volume: The volume of liquid you ended with after your boil.
Boil Time[minutes]: The amount of time you boiled your liquid.
Wort Shrinkage(pct): When liquid is heated it expands, this is known as thermal expansion. Thus when it cools it shrinks. By default the shrinkage percentage is 4%. We recommend leaving it at 4%, but you can adjust this number to match your actual percentage.
Calculate: Simply click the "Go" button to see the results of your boil off percentage calculation.