Construction & Materials

Swimming Pool Calculator

Calculate the water volume of rectangular, circular, or oval swimming pools in gallons and liters. Essential tool for chemical dosing.

Reviewed by Elena Rostova, P.E. (P.E., M.S. Civil Engineering (Georgia Tech))

Verified for accuracy•Updated 2026

Interactive Calculator

1. Provide Details

Pool Geometric Shape

Length / Longest Diameter (ft)

Width (ft - ignore for Round pools)

Average Depth (ft)

2. Output Results

Pool Volume (Cubic Feet)1296 cu ft

Estimated Pool Water Capacity9695 gallons

Volume in Liters36699 L

Estimated Water Weight80855 lbs

How to Calculate: Formula & Steps

Computes volume in cubic feet, then multiplies by 7.48 (gallons per cubic foot). Oval and circular calculations apply shape multipliers.

Formula Used:Gallons = Length (ft) × Width (ft) × Average Depth (ft) × 7.48

Step-by-Step Calculation Example

A 24ft × 12ft rectangular pool with a 4.5ft average depth holds approximately 9,694 gallons of water.

Common Mistakes to Avoid

Forgetting that pool depth is usually uneven, leading to an overestimation if the deep-end depth is used instead of the average depth.

Practical Use Cases

Pool opening chemical balancing
Water utility fee estimation

Expert Tips

Add 5% volume cushion if your pool has wide stairs or custom seating configurations in the frame.

Disclaimer

This calculation tool is provided for educational and informational estimation purposes only. Results are based on mathematical formulas and user-supplied parameters. They do not constitute formal underwriting, financial, tax, engineering, or legal determinations.