Methods, Sources & Assumptions
Rectangular area = length × width. Circle area = π × diameter² ÷ 4. Ellipse area = π × length × width ÷ 4. Capsule area = (overall length − width) × width + π × width² ÷ 4. Water volume is area × the appropriate average water depth, minus entered submerged-solid displacement.
A uniform linear slope permits the mean of shallow and deep depths. Separate rectangular zones instead sum width × zone length × mean of zone endpoint depths. Do not use a simple unweighted depth average for an irregular floor.
The exact international foot is 0.3048 m. A US liquid gallon is 3.785411784 L, while an Imperial gallon is 4.54609 L. A 32 × 16 × 4.5 ft rectangular water volume is 2,304 ft³, or approximately 17,235 US gallons and 65,242 liters.
What the result means
Results are planning estimates. Unrounded values are used in the calculations; rounding is applied for display and whole purchasing units. Changing the unit system resets example values rather than silently treating old numbers as different units. The calculator rejects invalid dimensions and impossible combinations.
Sources
- NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement
- Pentair Sta-Rite Basic Training Manual, Swimming Pool Gallons, printed page 7 / PDF page 9
- NIST Guide to the SI, Appendix B.9: Volume conversion factors
Corrections
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