Aquarium calculator app
Plan a fish tank from your phone. Aquarium Calc figures volume, stocking, substrate, heater wattage, filter flow, salt mix, lighting, and water changes for freshwater, planted, marine, and reef aquariums.
Fish tank calculators in one app
Each tool is the same calculator as on the website, sized for a phone. Save a tank once and reuse the measurements when you check stocking, a heater, or a filter.
Volume
Net gallons and liters for rectangular, cube, cylinder, bowfront, and corner tanks, including water the substrate displaces.
Stocking
Fish capacity from real water volume, adult size, and bioload, instead of a flat inches-of-fish rule.
Substrate
How much gravel, sand, or aquasoil to buy for the depth you want, plus the water that bed displaces.
Weight
Filled tank weight from water, glass, stand, and substrate before you commit to a shelf or floor.
Water change
The change volume that moves nitrates from the reading you have to the target you want.
Salt mix
Marine and reef salt doses for a target salinity in ppt or specific gravity.
Glass safety
Panel thickness, safety factor, and bowing risk before a DIY aquarium build.
Setup cost
A realistic budget for freshwater, planted, saltwater, and reef setups before you buy the tank.
Lighting
PAR range and LED wattage for planted tanks and reef aquariums.
Filter and flow
Turnover and filter flow in GPH or L/h for the livestock and tank type you keep.
Heater
Heater wattage from tank volume, room temperature, and the water temperature you need.
Aquarium calculator app questions
Is there a free aquarium calculator app?
Yes. Aquarium Calc is a free aquarium calculator app on Google Play. It covers fish tank volume, stocking, substrate, weight, water changes, salt mix, glass thickness, setup cost, lighting, filter flow, and heater size.
Is the aquarium calculator available on iPhone?
The iPhone and iPad app is coming soon. Android is available now on Google Play. The same aquarium calculators also run in the browser on aquariumcalc.com.
Does the app work for freshwater and saltwater tanks?
Yes. Use it for freshwater, planted, marine, and reef tanks. Volume covers common aquarium shapes, and the salt mix calculator is there when you need a salinity target.
Can I save my tank in the app?
Yes. Tanks you save stay on the phone, and those measurements carry into the other calculators so you are not retyping length, width, and height each time.