Pool Volume Calculator
Estimate your pool’s water volume to plan maintenance, compare filling costs and follow product directions with a more useful starting point.
- 2026 figures, checked October 26, 2026
- Private: runs in your browser
- How we check our work
Result
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Verify before you act: review these results with a licensed contractor, engineer or the local building department before making any decision based on them.
Suggestions for your numbers
Updated as you type, from your inputs only. General information, not personal advice; confirm any change with a qualified professional.
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What is pool volume?
Pool volume is the amount of water your pool can hold. A pool volume calculator estimates that amount in gallons, and may also show cubic feet and liters.
The estimate depends on the pool’s shape and dimensions. For a sloped floor, the calculator uses the shallow and deep depths to find an average depth. The result is an estimate, not a measurement of the water currently in your pool.
Why pool volume matters
You need a reasonable volume estimate when following pool-care product directions. If the volume is off, you may use too much or too little product. Check the product label and use the units it specifies.
Volume also helps you plan the cost of filling or refilling a pool. You can use the estimate when reviewing a water bill or asking a service provider for a quote. If you are comparing equipment or a pool service plan, share the dimensions and estimated volume so you are comparing options on the same basis.
How to use this pool volume calculator
- Choose the pool shape: rectangle, round or oval.
- Enter the length or diameter and width requested by the calculator. Measure the pool itself, not the surrounding deck.
- Enter the shallow and deep depths. Measure from the waterline or pool floor consistently, and use the depth fields as labeled.
- Review the average depth and volume in gallons, cubic feet and liters. If the dimensions are estimates, treat the result as an estimate too.
Pool volume calculator example
Worked example
For a rectangle with a length of 32 ft, width of 16 ft, shallow depth of 3.5 ft and deep depth of 6 ft, the calculator gives an average depth of 4.75 ft. The result is 2,432 cubic feet, 18,191 gal and 68,867 liters. The calculation is gallons = volume in cubic feet x 7.48.
How to read your pool volume result
Use the gallons result when a pool-care product or service provider asks for pool gallons. Use cubic feet or liters when those are the units on a form, bill or product label.
Average depth summarizes a pool with a sloped floor. The displayed volume is based on that average, so it can differ from the exact amount of water in a pool with unusual contours, ledges or built-in features. Confirm the estimate with a pool professional if a precise volume is needed for a purchase or service.
How to improve your pool volume estimate
- 01
Measure the inside dimensions
Measure from the inside edge of the pool rather than using construction plans or deck dimensions. Recheck any measurement that looks uncertain before entering it.
- 02
Use consistent depth measurements
Measure the shallow and deep ends from the same reference point. If the floor has a slope or unusual shape, ask a pool professional how to represent it in the calculator.
- 03
Keep the result with your pool records
Save the dimensions and estimate with maintenance notes. Use the same estimate when comparing service quotes or checking product directions, and update it if you change the pool.
Common pool volume calculator mistakes
Entering outside measurements
The deck and outer walls are not the water-holding area. Use the pool’s interior dimensions.
Mixing up diameter and width
Follow the label shown for your selected shape. A round pool is described by its diameter; do not enter a radius in a field asking for diameter.
Treating the estimate as exact
Irregular floors, benches and other features can affect actual capacity. Keep that in mind when dosing products or arranging a fill.
The pool volume formula
Gallons = volume in cubic feet x 7.48.
Key terms
- Pool volume
- The estimated amount of water a pool can hold.
- Average depth
- A depth used to represent a pool whose floor slopes between shallow and deep areas.
- Cubic feet
- A unit of volume used to express the space occupied by the pool water.
- Gallons
- A unit commonly used to describe pool capacity and water volume.
Pool volume questions
How does the pool volume calculator estimate gallons?
It estimates the pool’s volume from its shape and dimensions, then uses the formula gallons = volume in cubic feet x 7.48.
Why does the calculator ask for shallow and deep depths?
A sloped pool has different depths at different ends. The calculator uses them to find an average depth for its volume estimate.
Can I use the result to measure chemicals?
Use the estimate as a starting point, then follow the product label and its unit instructions. Ask a pool professional if the pool shape makes the estimate uncertain.
What if my pool has an unusual shape?
The calculator covers rectangular, round and oval pools. For a pool that does not fit those shapes, ask a pool professional for a volume estimate rather than forcing the dimensions into a shape that does not match.
Before you act on this result. Cordwell calculators and guides are educational estimates, not legal, tax, investment, lending or other professional advice. They rely on the numbers you enter and on simplified rules, and they can't see your full situation. Before you file, sign, borrow, invest, hire, change your withholding or form a business based on anything here, meet with a licensed contractor, engineer or the local building department who can review your specific facts and confirm the numbers. Rules change, and official agency guidance always controls.