Pool Volume Calculator

Find how many gallons your pool holds, how long it takes to fill, and what the water costs.

Pool Shape
Same as shallow for a flat bottom.
Filling
A garden hose runs about 5 to 12.
$
Fractions and decimals both work.
–
Gallons
Average depth
Surface area
Cubic feet
Liters
Fill time
Chemical units
Water Cost

Pool List

Items you add are saved in this browser.

PoolSizeGallonsLitersFill TimeRemove

How to Calculate Pool Volume

Find the surface area, multiply by the average depth to get cubic feet, and multiply by 7.48 gallons per cubic foot. For a sloped bottom, average the shallow and deep ends.

Average depth = (shallow + deep) ÷ 2
Rectangle: L × W × avg depth × 7.48   Round: 0.785 × diameter² × avg depth × 7.48
Oval: 0.785 × L × W × avg depth × 7.48   Kidney: 0.45 × (A + B) × L × avg depth × 7.48

Pool builders often shorten these to L × W × depth × 7.5 for rectangles and diameter² × depth × 5.9 for round pools (0.785 × 7.48 = 5.87). This page uses the unrounded factors, so it can read a little lower.

Worked Example

Round Above-Ground Pools

Diameter48″ Wall (about 4′ of water)52″ Wall (about 4.3′)54″ Wall (about 4.5′)

Water depth assumed 6 inches below the wall height. Check your pool maker's chart.

Tips

Pool chemical doses are given per 10,000 gallons, so knowing your volume matters for chlorine, shock and balancing. Kidney and free-form shapes are estimates; your builder's plans give the exact number. Many water utilities offer a sewer credit when you fill a pool; ask before you fill.