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An answer offered from another forum: It can be derived as a function of the difference in gravity Pre boil Volume = Post Boil Volume * (Post Gravity Points / Pre Gravity Point) In this instance, pre gravity is 1.021, post is 1.030. Post boil volume is 23.7 litres Pre Boil Volume = 23.7 * (30 / 21) Pre Boil Volume = 33.9 litres


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If you know your exact boil of rate you can calculate it from pre boil gravity (providing the sample was well mixed), OG, and post boil volume. However a record of pre boil volume is really only useful to determining boil off rate and mash effciency. Which are useful numbers to have for future batches but play little role in your current beer. Your OG and ...



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