Have you ever finished sparging, only to wonder what your Final Gravity will be post boil? Or have you ever worked on a recipe in Promash and wondered what your Pre Boil Gravity should be? The calculators below will provide answers to both. Knowing your Pre Boil Gravity puts you in the driver's seat to hit your target OG. If you are high or low options include adding more water, boiling longer, or adding DME. For a more complete description of options to hit your target gravity see the article mentioned below.
Prior to using, you should know that Gravity Points are simply the numbers to the right of the decimal point in a specific gravity reading multiplied by 1000. A Specific Gravity of 1.050 would equal 50 Gravity Points.
Formulas are from Bill Pierce, in a Brew Your Own magazine article entitled "On the boil" from the September 2007 issue.