Garden & Water Utilities
Combined-Shape Pool Volume Calculator
Approximate an irregular pool by adding non-overlapping rectangles, circles, ovals, triangles or trapezoids, each with its own average depth.
Break the footprint into measured sections
Measure the pool as simple, non-overlapping sections. This is geometry only: it does not provide chemical, safety or equipment advice. Sloped bottoms, benches, steps and curved edges need more measurements and can make the estimate materially different.
Source: Michigan State University Extension, Swimming Pool Training Manual (public manual; accessed 2026-09-29).