About this calculator
Water capacity of a pool, pond or hot tub, for chemical dosing, heater and pump sizing, and fill costs.
How it’s calculated
Volume = surface area × average depth. Average depth = (shallow + deep) ÷ 2. 1 m³ = 1,000 litres.
Worked example
With these inputs:
- Shape
- Rectangle
- Length / diameter
- 10 m
- Width
- 5 m
- Shallow end depth
- 1 m
- Deep end depth
- 2 m
the result is:
- Water volume
- 75,000 L
- Surface area
- 50 m²
- Average depth
- 1.5 m
- US gallons
- 19,813
Tips from the trade
- Follow chemical labels against this volume. Never guess a dose.
- Pools and spas deeper than 300 mm need a barrier that meets AS 1926.1 and your state’s pool safety laws, and in most states the pool must be registered.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and the NCC and Australian Standards before ordering.