Aquarium Calculator

Aquarium calculator for the water your fish tank actually holds. Gallons and liters, how many fish fit, heater watts, filter flow, salt mix, substrate, light, glass, weight, and setup cost all come from that one tank. What you can calculate • Gallon and liter volume, after substrate and hardscape • How many fish the tank can hold, from adult size and bioload • Water-change volume, and the nitrate drop that change produces • Substrate for gravel, sand, or soil at the depth you want • Heater wattage for the temperature you are aiming for • Filter turnover for the kind of system you keep • Light targets in PAR for planted tanks and reef • Salt mix for a salinity and specific gravity • Glass safety factor and panel thickness for a planned build • Filled weight, so you know the load on the stand and floor • A setup budget before you start buying gear Save more than one tank and choose which one is active. The tools list shows that tank’s key results. Open a calculator and it keeps the last setup you used for that tank. Use gallons or liters, inches or centimeters. Appearance can follow the device, or stay light or dark. Languages: English, Japanese, Hindi, Spanish, German, French, and Portuguese. Calculations stay on your device. No account is required. Aquarium Calc is a planning tool. Stocking numbers are estimates, not a promise that species will live together. Glass results are a safety-factor check for a planned panel, not an engineering sign-off. Keep watching the animals, and keep testing the water.