Water Tank Volume Calculator
Works out tank capacity, and how much is in it at a given depth.
Capacity
— L
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
US gallons — gal
Imperial gallons — gal
Water at this depth — L
Weight of water when full — kg
The formula
cylinder = π ÷ 4 × d² × h box = l × w × h
A horizontal cylinder is not linear: a tank half full by depth is half full by volume, but at other depths the circular segment formula is needed, and that is used here.
What to watch out for
Water weighs 1 kg per litre, so check what the tank stands on can carry it.
Frequently Asked Questions
How many litres are in a 1.5 m wide, 2 m tall tank?
3,534 litres.