Tank volume and fill time calculator
Work out the capacity of a tank, cistern or pond and how long a pump or supply line takes to fill it.
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How it is calculated
Cylinder: V = π × D² / 4 × h Rectangular: V = L × W × h
time = volume / flow
1 m³ = 1000 liters = 264.2 US gallons. For a horizontal cylinder the result is the full volume; partial volume is not proportional to water depth.
Frequently asked questions
How many gallons is a tank 2 m across and 2 m high?
About 6283 liters, or 1660 US gallons.
How long to fill it at 5 m³/h (22 GPM)?
About 1 hour 15 minutes from empty.