PooloraPool volume calculator
Calculate pool volume in US gallons, liters and cubic meters, plus surface area in square feet, from rectangular, round or oval pool measurements.
Start with the amount of water you actually have. Every chemical dose depends on pool volume; a depth or unit error carries through to every treatment.
How the calculation works
Rectangular: length × width × average depth. Round: π × diameter² ÷ 4 × average depth. Oval: π × length × width ÷ 4 × average depth. Feet give cubic feet; multiply by 7.48 for US gallons. Meters give cubic meters; multiply by 1,000 for liters.
Pool surface area
Surface area is the area of the water surface, without depth. The calculator shows it next to the volume:
- Rectangular: length × width. A 32 × 16 ft pool has 512 sq ft.
- Round: π × diameter² ÷ 4. A 24 ft round pool has about 452 sq ft.
- Oval (ellipse): π × length × width ÷ 4.
Surface area sizes a cover (add a margin for the edge) and tells you how many inches the level drops when you drain a given amount of water.
Worked example
A 32 × 16 ft rectangular pool with 5 ft average water depth holds about 19,150 US gallons. In metric, an 8 × 4 m pool with 1.5 m average depth holds about 48,000 L (48 m³).
Before using the result
Measure water depth, not wall height. The oval option assumes a true ellipse. Steps, benches and irregular floors reduce accuracy; prefer a measured fill volume when available.
Related guides
Your pool, your products, one plan
Keep your pool measurements and get a personalized plan in Poolora for iPhone. Free to start; advanced features require Pro.