Proof & Cut

Proofing Room

Proof & Cut

Enter what you're starting with, the proof you're cutting to, and the batch temperature — it works out how much water to add, by weight and by volume.

Starting Batch

Water to add

— lb
— Gallons
— Liters

Starting batch

Weight—
Volume—
Volume—
Proof gal—

Final, cut batch

Weight — 90%—
Volume—
Volume—
Proof gal—
How this works: water added is computed directly from TTB Gauging Manual Table 4 (gallons per pound at each percent of proof, 60°F) — proof gallons are conserved when spirits are cut with water, so the core weight figure is exact to Table 4 itself, not an approximation. Gallon and liter figures additionally apply your batch temperature via CRC Handbook density-ratio data. For official TTB tax gauging, verify against the Distilled Spirits Gauging Manual.