Calculators
Aquarium calculators
Work out the volume, size the heater and plan water changes. Instant results, no sign-up.
All calculators
- pH and CO2 in the aquarium
How to calculate aquarium CO2 from pH and KH: formula, CO2 chart and the safe range of 15–35 mg/l (ppm) for plants and fish.
- Aquarium volume calculator
Work out aquarium volume from dimensions in cm: tank capacity, how much water is really in it after the substrate, and how much the setup weighs. With a size chart.
- Aquarium heater size calculator
Aquarium heater size calculator: enter tank volume, room and water temperature. Get the wattage and a common heater size, based on the 1 watt per litre rule.
- Nitrate and water change calculator
Work out where nitrate (NO3) will settle with your water changes and what percentage you need to change each week to stay below your target.
Keep an eye on your tank from your phone
The app is free and ad-free. The monitor runs on your Raspberry Pi.