Pool Volume Calculator
Planning to fill a pool or dose chemicals? This free calculator finds the water volume of rectangular, round or oval pools in liters and gallons from your dimensions, and estimates the full-fill time from your pump or supply flow rate — instantly, in your browser.
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How to use
- Select the pool shape.
- Enter length, width / diameter and average depth — for a sloped floor, take the average of the deep and shallow parts.
- Enter the pump or supply flow to also get the fill time.
- Capacity shows in liters and gallons.
Tips
- For a sloped floor, measure the deep and shallow ends and use the average depth.
- Measure at the waterline, not the deck — overfilled estimates inflate your chemical dosing.
- Re-run the calculation after rain or refilling if your water level changed a lot.
Note: 1 ft3 = 28.3168 liters. Chemical dosing is always based on the actual capacity, so this calculation also works for dosing.