Aquarium calculators

Aquarium Volume Calculator

Pick your tank shape, enter the size in inches or centimetres, and get gallons, litres, the water left after substrate and rock, and the filled weight.

Fish Tank Calculator

Choose your tank size and get gallons, litres, the weight when full, the heater and filter to buy and the load on your floor.

Aquarium Substrate Calculator

Enter the tank bottom and the depth you want, choose sand, gravel or soil, and get pounds, kilograms and the number of bags to buy.

Salinity Calculator

Turn a hydrometer reading into ppt and mS/cm at your water temperature, then get the pounds and cups of salt mix for the water change.

Aquarium Stocking Calculator

Pick your tank and filter, add fish from a list of sourced species, and get a stocking level with the compatibility warnings that matter.