Pool Volume Calculator
Estimate pool water volume from shape, dimensions, average depth and current fill level
Water volume
How we calculated it
About the Pool Volume Calculator
Pool Volume Calculator estimates how much water a swimming pool holds from its shape and dimensions. It is useful for filling, chemical dosing and equipment sizing when manufacturer capacity is unavailable.
Average depth is important for sloped pools. Using the deepest point as if the whole pool had that depth can substantially overstate volume.
How to Use the Pool Volume Calculator
- Choose the pool shape that best matches the actual pool.
- Enter length, width or diameter.
- Enter average water depth or shallow and deep depths when supported.
- Calculate volume and use the result as a planning estimate for water treatment or filling.
How the Calculation Works
For a rectangular pool, volume = length × width × average depth. A circular pool uses V = πr²×average depth.
When shallow and deep depths change approximately linearly, average depth can be estimated as (shallow depth + deep depth) ÷ 2 before multiplying by surface area.
Worked example
Pool Volume Calculator Worked Example
30 ft × 15 ft pool averaging 5 ft deep
Volume = 30×15×5 = 2,250 ft³. At about 7.4805 U.S. gallons per ft³, that is approximately 16,831 gallons.
Result guide
Understanding Your Pool Volume Calculator Result
The result is geometric water volume. Steps, benches, curved walls and actual fill level can make true capacity differ from the simple shape estimate.
Before you rely on the answer
Assumptions and Limitations
- Selected geometry reasonably represents the pool.
- Average depth represents the actual water profile.
- Steps, benches and irregular contours are excluded unless specifically modeled.
Practical tip
Using This Result in Practice
For chemical treatment, compare the calculated volume with any builder or equipment documentation available. Dosing errors scale directly with volume errors.
Related calculations
Useful Calculations to Continue With
If the container is a regular storage tank rather than a pool, use the Tank Volume Calculator.
If the result must be converted between gallons, litres or cubic metres, use the Volume Converter.
Common questions
Pool Volume Calculator FAQ
How do I find average pool depth?
For a simple linear slope, average shallow and deep depths by adding them and dividing by two.
How many gallons are in one cubic foot?
About 7.4805 U.S. gallons.
Why might actual pool capacity differ?
Steps, benches, curved walls and the real fill level change the water volume from a simple geometric model.