About FishTankCalc.com

FishTankCalc.com was developed to provide aquarists, reef keepers, and freshwater fishkeeping hobbyists with a mathematically precise tool for calculating volume, water weight, substrate bed quantities, and stocking bio-loads.

Hydro Calculation Standards

Volume calculations are based on exact geometric conversions (231 cubic inches per US liquid gallon). Water weight calculations use freshwater density standards of 8.34 lbs per gallon and marine saltwater density standards of 8.55 lbs per gallon.