Pool Volume Calculator
Enter pool shape, dimensions, and average depth to get the volume in gallons and cubic feet — for rectangular, oval, and round swimming pools.
Pool
Average depth = (shallow end depth + deep end depth) ÷ 2.
Pool volume
Knowing your volume is essential for correct chemical dosing. Always test water before treating.
How to calculate pool volume
Rectangular: length × width × avg depth × 7.48. Oval: multiply by 0.785 before the depth. Round: use π × radius² for the area. Average depth = (shallow + deep) ÷ 2. Knowing your exact gallon count is essential for correct chemical dosing.
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Pool volume FAQ
- How do I calculate gallons in a swimming pool?
- For a rectangular pool: length × width × average depth (in feet) × 7.48 gallons per cubic foot. For oval pools, multiply by 0.785 instead of the full width. For round pools: π × radius² × depth × 7.48.
- What is the average depth of a pool?
- Average depth is the shallow end depth plus the deep end depth divided by two. For a pool that is 3 feet in the shallow end and 6 feet in the deep end, the average depth is 4.5 feet.
- Why does pool volume matter?
- All pool chemical dosing — chlorine, algaecide, pH adjusters, shock — is calculated per gallon or per 10,000 gallons. Getting the volume wrong leads to under- or over-treating the water.
- How many gallons is a typical residential pool?
- A common 16×32 ft rectangular pool with 4.5 ft average depth holds about 17,200 gallons. Smaller 12×24 pools run around 10,800 gallons. Large pools can exceed 30,000 gallons.
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See also: estimating guides · ProBuildCalc by trade