Quick Pool Math: Gallons from Dimensions
You don’t need an app to estimate your pool’s volume. Use a tape measure and these formulas:
Rectangular: Length (ft) × Width (ft) × Average Depth (ft) × 7.5 = Total Gallons
Circular: Radius (ft)² × Average Depth (ft) × 7.9 = Total Gallons
Oval: Length × Width × Average Depth × 5.9 = Total Gallons
Why it matters: Chemical labels dose per 10,000 gallons. Being off by even 2,000 gallons can mean too little (ineffective) or too much (irritating). A quick measurement keeps balancing accurate and chemical use efficient.
The Pool Pro Calc Pack includes a reference chart and calculator for these shapes, so you can calculate once and reuse the number season after season.