Pool Volume Calculator
Your estimate
Capacity18,192.6 gal68,866.6 L
- Volume
- 68.867 m³2,432 ft³ · 18,193 gal
- Average depth
- 4 ft 9 in4.75 ft · 1.45 m
- Water surface
- 512 ft²56.89 yd² · 47.57 m²
Gallons or litres in your pool — for chemicals, filling and heaters.
Updated 2026-10-20 · Based on: exact volume formulas (1 US gal = 3.785 L).
How to use the Pool Volume Calculator
- Pick the pool shape.
- Enter the length and width (or diameter).
- Enter the shallow and deep end depths.
Formula
Volume = surface area × average depth. Average depth = (shallow + deep) ÷ 2.
Rectangle: l × w. Round: π r². Oval: π × l/2 × w/2. Kidney ≈ 0.75 × l × w. 1 ft³ = 7.48 gallons.
Worked example
With the values preset in the calculator above: (Rectangle)
- Length
- 32 ft
- Width
- 16 ft
- Shallow end depth
- 3.5 ft
- Deep end depth
- 6 ft
- Capacity
- 18,192.6 gal (68,866.6 L)
- Volume
- 68.867 m³ (2,432 ft³)
- Average depth
- 4 ft 9 in (4.75 ft)
- Water surface
- 512 ft² (56.89 yd²)
Pool gallons for common sizes
| Length (ft) | Width (ft) | Capacity |
|---|---|---|
| 24 | 12 | 10,233.4 gal |
| 32 | 16 | 18,192.6 gal |
| 36 | 18 | 23,025 gal |
| 40 | 20 | 28,426 gal |
Frequently asked questions
How many gallons in a 16 × 32 pool?
With 3½ ft and 6 ft ends: 18,192.6 gal.
How many gallons in a 24 ft round above-ground pool?
At 4 ft deep (both depths 4 ft): 13,536.4 gal.
How long to fill a pool with a hose?
A garden hose gives about 9–10 gallons per minute, so 20,000 gallons takes about 35 hours.
More calculators
Estimates only — check quantities with your supplier and local building code before you order.