Use this free pool volume calculator to plan a home-improvement or DIY project from the measurements and product information you already have.
HomeCalc shows the formula behind the result and keeps product-dependent assumptions editable where possible, so the calculator can match the material, package or supplier you actually plan to use.
🧮 Quick answer
Choose the pool shape and enter dimensions plus average depth. HomeCalc converts volume to US gallons and liters.
Choose the pool shape and enter dimensions plus average depth. HomeCalc converts volume to US gallons and liters.
FREE POOL VOLUME ESTIMATOR
Pool Volume Calculator: Gallons, Liters & Cubic Feet
Estimate pool water volume for rectangular, round or oval pools using average depth.
Estimated result
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Planning estimate: real material requirements can vary with measurements, cuts, waste,
product yield, installation method and supplier packaging. Check the manufacturer or supplier information before buying.
Estimate pool water from shape and average depth
Pool capacity is a volume calculation. HomeCalc calculates the plan area for the selected shape, multiplies it by average depth and converts the result to US gallons and liters.
HomeCalc formula
pool surface area × average depth = water volume
What to check before using the result
- Use average depth when the pool has a shallow and deep end.
- Measure water dimensions rather than external deck or coping dimensions.
- Irregular freeform pools can differ from simple geometric estimates.
- Use the volume as a planning value for filling and treatment; follow chemical-product instructions separately.
Average depth is critical for sloped-bottom pools
Using only the deepest point can significantly overstate capacity. For a simple slope, an average of shallow and deep depths is a more representative planning input.
Using only the deepest point can significantly overstate capacity. For a simple slope, an average of shallow and deep depths is a more representative planning input.
Frequently asked questions
How many gallons are in one cubic foot?
One cubic foot is approximately 7.48052 US gallons.
Can I calculate a round pool?
Yes. Select the round shape and enter the diameter and average depth.
Is this accurate for a kidney-shaped pool?
It is best for the supported geometric shapes. Irregular pools may need manufacturer data or a more detailed measurement method.