Pool Volume Calculator
How many gallons or litres a pool holds, for rectangular, round, oval and kidney pools, with a constant depth, a slope or a flat-slope-flat floor.
Result
Buy 21,065 gal
Water to the brim of vertical walls. Fill to your usual water line for dosing.
- In litres
- 79,740 L
- In cubic feet or metres
- 2,816 ft³ (79.74 m³)
- Water surface area
- 512 ft² (47.57 m²)
- Average depth
- 5.5 ft (1.68 m)
https://calcgallery.com/home-systems/pool-volume-calculator/
Results are estimates for planning only. Actual needs vary with site conditions, products and workmanship. Always confirm quantities with your supplier and follow local building codes and manufacturer instructions. Read the full disclaimer
How to use the Pool Volume Calculator
- Choose the pool's shape and enter its size at the water line.
- [object Object]
- Read the volume in gallons and litres. Use it on the chlorine page, or anywhere a product is dosed per volume of water.
The formula
volume = surface area × average depthrectangle length × widthround π × (diameter ÷ 2)²oval π × (length ÷ 2) × (width ÷ 2)kidney about 0.45 × (narrow end + wide end) × lengthFor one even slope, the average depth is halfway between the shallow and deep ends. For a flat shallow end, a slope and a flat deep end, each part counts for its own length:
average depth = (flat shallow length × shallow depth + slope length × (shallow + deep) ÷ 2 + flat deep length × deep depth) ÷ total lengthUnits
A US gallon is 231 cubic inches, so a cubic foot is 1,728 ÷ 231 = 7.48 gallons. A cubic metre is 1,000 litres. Both conversions are exact by definition, so the only uncertainty is in the measurements.
With your numbers
- Volume = surface area × average depth; 1 ft³ = 7.48052 US gallons
Quick reference
Water to the brim of vertical walls. Fill to your usual water line for dosing.
| Job | Pool volume |
|---|---|
| 32 × 16 ft, 3 to 8 ft | 21,065 gal |
| 32 × 16 ft, 5.5 ft | 21,065 gal |
| 32 × 16 ft, 4 ft flat, 8 ft slope | 25,853 gal |
| 18 ft round, 4 ft | 7,614 gal |
| 10 × 5 m, 1.5 m | 19,813 gal |
| Kidney 28 ft, 10 and 14 ft ends | 11,311 gal |
Common questions about the Pool Volume Calculator
- How many gallons are in my pool?
- Multiply the water surface area by the average depth, then convert: each cubic foot holds 7.48 US gallons. A 32 by 16 foot pool sloping evenly from 3 to 8 feet averages 5.5 feet deep, so it holds 32 × 16 × 5.5 = 2,816 cubic feet, about 21,065 gallons.
- My pool has a flat shallow end and a flat deep end. Can I average the depths?
- Not unless the flat parts are the same length. The average of the two depths only works for one even slope from end to end. A pool with a long deep end holds more than the simple average suggests, and one with a long shallow end holds less. Choose the three-part floor and enter the length of the flat shallow end and of the slope.
- How accurate is the kidney pool figure?
- It is an approximation. A kidney pool has no simple formula, and the common rule, 0.45 times the sum of the two end widths times the length, stands in for its area. For dosing that is usually close enough, and the page marks it as an estimate.
- Why do I need the volume for chemicals?
- Every pool chemical is dosed per volume of water: so many ounces per 10,000 gallons, or grams per cubic metre. An error in the volume carries straight into the dose, so it is worth measuring the pool rather than guessing.