Dilution Gravity Calculator

Summary

The Dilution Gravity Calculator tells you exactly what specific gravity to expect after adding plain water to your wort or beer. It uses the standard gravity-points formula — the same math professional brewers rely on — so you can confidently top off your kettle, hit a target pre-pitch gravity, or split a batch without guessing. Works in gallons or liters with any SG reading your hydrometer provides.

How it works

1. Enter the original wort or beer volume in gallons or liters.
2. Enter the original specific gravity reading (e.g. 1.060).
3. Enter the volume of water you are adding.
4. The calculator applies the gravity-points dilution formula: new gravity = ((original gravity − 1) × original volume) / new total volume + 1.
5. Read the resulting post-dilution specific gravity and the dilution percentage.

Use cases

• Top off a boil kettle after boil-off to hit a target gravity.
• Correct a high-gravity wort that missed your intended pre-boil target.
• Plan how much water to add before pitching yeast.
• Verify dilution math when splitting a batch into two fermenters.
• Calculate final gravity in a no-sparge or BIAB brew session.
• Adjust wort concentration after adding adjuncts that shift the gravity.

Frequently Asked Questions