About the Pool Volume Calculator
Enter your pool's shape, dimensions, and average depth to get its water volume in gallons and litres. Knowing the volume is essential for dosing chemicals and sizing pumps and heaters.
How it’s calculated
Volume = surface area × average depth (cubic feet) × 7.48 gallons. Surface area depends on shape (rectangular, round, or oval).
Example calculation
A 32 × 16 ft rectangular pool with a 5 ft average depth holds about 19,150 gallons.
Frequently asked questions
How do I find the average depth?
Measure the shallow and deep ends and average them. For most pools that slope gradually, the simple average works well.
Why does volume matter?
Chemical doses, pump and filter sizing, and heater capacity all depend on the number of gallons. Getting the volume right keeps the water balanced and the equipment matched.
This is a general material estimate for planning only. Actual quantities vary with waste, offcuts, site conditions, product coverage, and technique. Confirm measurements and coverage rates before ordering, follow local building codes, and round up — running short mid-project is costly.