Pool volume calculator for any shape.
Enter your pool dimensions and get gallons. Works for rectangle, oval, round, and kidney shaped pools. Result feeds straight into the chemical dosage calculator.
Enter your pool dimensions
Pool dimensions
Pool shape
For pools with one depth, set shallow and deep to the same value. Average depth is calculated automatically.
Pool volume
21,064gallons
- Avg depth
- 5.5 ft
- Surface area
- 512 ft²
- Cubic feet
- 2,816 ft³
Size bracket
Use this number for chemistry
Pair with the chemical dosage calculator to get exact dosing.
About this calculator
How pool volume is calculated
Pool volume in gallons depends on shape and dimensions. Rectangle uses length times width times average depth times 7.48 (gallons per cubic foot). Oval and round use elliptical / circular area formulas. Kidney and freeform are approximated using a 7.0 multiplier that accounts for the curved profile.
Average depth = (shallow end + deep end) / 2. For pools with one consistent depth, set both values the same. Knowing exact volume is the foundation of accurate chemical dosing, salt levels, and heater sizing.
Take the gallons straight to the chemical dosage calculator or the pool heater calculator.
How to calculate pool volume in gallons
Pick a pool shape, enter the dimensions, and get total pool volume in gallons. Use the result to size chemical doses, pumps, heaters, and filters.
Pick the pool shape
Select rectangle, oval, round, or kidney / freeform from the shape selector.
Enter the dimensions
Type in length and width (or the diameter for a round pool), then the shallow and deep depths. All values are in feet, and the average depth is worked out for you.
Read the volume
The calculator returns total pool volume in gallons. The number flows into the chemical dosage calculator if you click through.
In PoolStack
Run this in PoolStack
PoolStack runs the whole operation, not just the math.
A pool, a spa and a fountain sit on one account in PoolStack's pool service software, each with its own readings.
Book a demoKeep going
Related reading
Operations
Pool chemistry essentials: the 6 numbers every tech should know cold
The 6 pool chemistry essentials every tech should know: free chlorine, pH, total alkalinity, calcium hardness, CYA, and TDS. Target ranges and common mistakes.
May 14, 2026 · 12 min read
Guides
Pool filter types: DE vs sand vs cartridge for service operators
A pool service operator guide to pool filter types. DE, sand, and cartridge filters on filtration micron, cleaning frequency, cost, and recommendation fit.
May 15, 2026 · 11 min read
Guides
Saltwater pool maintenance: a service operator guide
A pool service operator guide to saltwater pool maintenance. Chemistry baseline, CYA for salt pools, cell maintenance, pH drift, and how to price salt service.
May 9, 2026 · 11 min read
More free tools
See all 12 tools
Book a demo.
Give us a little context about your operation. We'll show how PoolStack fits your routes, field team, construction work, and current software.
- 01No generic sales deck
- 02Migration questions answered directly
- 03A clear next step, even if PoolStack is not the fit
Tell us where to reach you.
Six quick fields. Then you will see the available times.