Pool shape volume multipliers (derivation)
The quick multipliers turn length × width × average depth (feet) straight into gallons. They come from 7.48 gallons per cubic foot and the area factor of each shape.
| Shape | Multiplier | Derivation |
|---|---|---|
| Rectangular / square | 7.5 | L × W × avg depth × 7.48 (a box) |
| Round | 5.9 | π/4 × 7.48 ≈ 5.87 (circle area factor) |
| Oval | 5.9 | π/4 × 7.48 ≈ 5.87 (ellipse area factor) |
gallons ≈ multiplier × length × width × average depth (all in feet).