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Pool Volume Calculator
Find how many gallons or liters your swimming pool holds. Choose a rectangular, round or oval pool, enter its dimensions and the depth at the shallow and deep ends, and the calculator uses the average depth.
- In liters
- 83,365 L
- In cubic feet
- 2,944 cu ft
- Average depth
- 5.75 ft
- Weight of the water
- 183,420 lb
Saved setups
Save a set of inputs you reuse — your usual rate, your loan, your room sizes — and load it back in one tap.
Your recent calculations
Results you calculate here are kept on this device so you can come back to them.
Formula
How to use it
- Choose the pool shape.
- Enter the length and width, or the diameter.
- Enter the water depth at the shallow and deep ends.
- Read the volume and switch the unit to liters or cubic meters if you need it.
Worked examples
A 32 × 16 ft rectangular pool, 3.5 ft at the shallow end and 8 ft at the deep end
- In cubic feet
- 2,944 cu ft
- Average depth
- 5.75 ft
- Pool volume
- 22,023 gal
- In liters
- 83,365 L
A round above-ground pool 18 ft across with 4 ft of water
- In cubic feet
- 1,017.9 cu ft
- Pool volume
- 7,614 gal
- In liters
- 28,823 L
An oval pool 30 × 15 ft with 4 ft of water
- In cubic feet
- 1,413.7 cu ft
- Pool volume
- 10,575 gal
- In liters
- 40,032 L
Why volume matters
Every chemical dose — chlorine, shock, pH adjusters, algaecide, salt — is given per 10,000 gallons or per 10,000 liters, so an accurate volume keeps you from over- or under-treating. It also tells you what size pump, filter and heater the pool needs.
Measure water depth, not wall height. An above-ground pool with 52 in walls typically holds about 48 in of water.
Shortcuts and limits
In feet, the quick multipliers are: rectangular pools, length × width × average depth × 7.5; round pools, diameter × diameter × depth × 5.9. This calculator treats an oval as a true ellipse; pool charts for flat-sided ovals often use a slightly larger factor (length × width × depth × 6.7), so expect a figure up to about 14% higher from those.
Averaging the two depths assumes an evenly sloping floor. A pool with a short deep hopper and a long shallow end holds less than this estimate; for those, calculate the sections separately and add them.
Questions people ask
How many gallons are in a 16×32 pool?
With a 3.5 ft shallow end and an 8 ft deep end (5.75 ft average), a 16 × 32 ft pool holds about 22,000 gallons, or 83,400 liters.
How many gallons are in an 18 ft round pool?
With 4 ft of water, about 7,600 gallons (28,800 liters).
How many gallons are in a cubic foot of water?
7.48 US gallons, weighing about 62.4 lb.