Pool Volume Calculator
Work out a swimming pool's volume — rectangular, circular or irregular — from its dimensions and average depth, in cubic metres, litres and gallons.
A pool's volume is its dimensions times its average depth — and it is the number behind chemical dosing, fill times and pump sizing. This calculator is that number, for any pool shape.
Enter the dimensions and the average depth; the volume follows in cubic metres, litres and gallons.
Your results
Enter your measurements and press Calculate.
Quantities are rounded up to whole tiles, planks, boxes or bags, after the wastage allowance. Cost appears only when you enter a price.
Formula
All lengths are converted to a single unit before the calculation: 1 ft = 0.3048 m, 1 in = 25.4 mm, 1 ft² = 0.09290304 m², 1 yd² = 9 ft². Material quantities are rounded up — you cannot buy part of a tile, plank or bag.
How to use this calculator
- Choose the pool shape.
- Enter the dimensions and the average depth.
- Read the volume in cubic metres, litres and gallons.
- Use the Copy results button to copy the answer.
Worked example
| Pool | 8 m × 4 m, average depth 1.5 m |
|---|---|
| Volume | 8 × 4 × 1.5 = 48 m³ |
| Litres | 48 × 1,000 = 48,000 L |
| US gallons | 48,000 ÷ 3.785411784 = 12,680.26 gal |
| Average depth | (1 m shallow + 2 m deep) ÷ 2 = 1.5 m |
Check it by hand: every step above uses the formula in the box. If your numbers match the example inputs but the calculator gives a different answer, please report it via the contact page.
Frequently asked questions
How do I work out the average depth?
Add the shallow-end depth and the deep-end depth, and divide by 2. A pool that is 1 m at the shallow end and 2 m at the deep end averages 1.5 m.
How many litres are in a cubic metre?
Exactly 1,000 litres. A 48 m³ pool holds 48,000 litres — about 12,680 US gallons.
What about an irregular-shaped pool?
Measure the surface area (or estimate it with the square footage calculator), then multiply by the average depth. Choose 'Irregular' here and enter the area.
Why do I need the pool volume?
For chemicals (chlorine dose depends on volume), for filling time, and for pump and filter sizing. This page gives you the volume; chemical dosing needs the product's own instructions.
Related calculators
Estimates only. Results are for planning. Measure twice, confirm box coverage and tile sizes on the packaging you buy, and follow the manufacturer's instructions. See the disclaimer.