Calculators
The numbers, worked out for you.
Four quick planted-tank calculators. Get your tank's true volume, how much substrate to buy, your dissolved CO2 from pH and KH, and how dry salts turn into ppm. All free, all in your browser, nothing to sign up for.
- Aquarium Volume Calculator
Work out how many litres and gallons your tank actually holds.
- Substrate Calculator
How much aquasoil, sand or gravel you need for your tank.
- CO2 and Drop Checker Calculator
Estimate dissolved CO2 from your pH and KH, and read the safe range.
- Fertiliser Dosing Calculator
Turn dry salts into ppm, or a target level into grams to weigh out.