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
- Cubic metres
- 75 m³
Tips from the trade
- Follow chemical labels against this volume. Never guess a dose.
- Check the rules for pool fencing and covers.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and SANS 10400 (the National Building Regulations) and your local municipality before ordering.