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Pool volume calculator
Enter your measurements in feet to get gallons and liters. Every chemical dose depends on this number, so it is worth measuring properly.
The formulas
| Shape | Gallons = |
|---|---|
| Rectangle | L × W × avg depth × 7.48 |
| Round | Diameter² × avg depth × 5.87 |
| Oval | L × W × avg depth × 5.87 |
| Kidney | 0.45 × (W1 + W2) × L × avg depth × 7.48 |
One cubic foot holds 7.48 US gallons. The 5.87 factor is 7.48 × π ÷ 4, the circle's share of its bounding square. Many pool shops round these to 7.5 and 5.9, which is why published charts differ slightly.
Measuring a sloped pool
Measure depth at the shallow and deep ends, to the water line, and average them. A 3 to 8 ft pool averages 5.5 ft. If the deep section is small, that overstates the volume: split the pool in two sections and add them. See the chart of common pool sizes.