Water volume calculator for tanks, ponds and pools
Pick the shape of the tank, pond or pool, enter its dimensions and the depth of the water. The calculator returns the volume of water, in cubic feet and US gallons or in cubic meters and liters.
Measure the depth of the water itself, not the height of the walls. For a container with sloping sides or a deeper end, split it into simple parts and add the results.
Volume of water 6 m³ In liters 6,000 L
Method and limitations
Rectangle: volume = length × width × water depth. Round (cylinder): volume = π × (diameter ÷ 2)² × water depth. Imperial: lengths in feet, so the volume is in ft³, and 1 US gallon = 231 in³ exactly, so 1 ft³ = 1,728 ÷ 231 US gallons. Metric: lengths in meters, so the volume is in m³, and 1 m³ = 1,000 L. The result is the volume of a container with vertical walls and a flat bottom filled to the depth you enter: slopes, steps, rounded corners, plants, equipment and evaporation are not taken into account. This is a geometric calculation, so no external source is needed.
Sources
No external reference is documented for this calculation; its method and limitations are described above.
