Pool Volume Calculator
Estimate the water held by one rectangular, round, or oval pool plan. A floor that changes depth is approximated with the arithmetic average of its shallow and deep measurements.
How to use the Pool Volume Calculator
Enter pool shape, plan dimensions in feet, and shallow and deep depths in feet.
Review actual waterline dimensions, benches, steps, irregular transitions, freeboard, and measurement uncertainty.
Read surface area, average depth, and estimated volume in cubic feet, US gallons, and liters.
Formula
Average depth = (shallow depth + deep depth) ÷ 2. Rectangular volume = length × width × average depth; circular volume = π × radius² × average depth; convert ft³ to US gallons by multiplying by 7.48051948.
Example
A 30 ft × 15 ft rectangular pool averaging 5 ft deep holds 2,250 ft³, or about 16,831 US gallons.
Assumptions and limitations
- Depth changes are approximated by an arithmetic average and the selected plan shape does not account for curved walls or displaced structures.
- Pool Volume Calculator treats the entered values as estimates and does not infer missing project, account, or personal details.
- Calculations retain working precision except where the cited method requires an intermediate rounding step; displayed values are then formatted separately. Source rules and dated rates must be rechecked when they change.
Sources
- National Institute of Standards and Technology: SI Units — LengthLength, area, volume, and unit-conversion conventions. Reviewed 2026-08-14.
- Centers for Disease Control and Prevention: Model Aquatic Health CodeAquatic-facility water-volume and operation context. Reviewed 2026-08-14.
- National Institute of Standards and Technology: Circumference, Area and VolumeOfficial formula, rate, or program guidance used by this calculator. Reviewed 2026-08-14.
- Centers for Disease Control and Prevention: About Home Pool and Hot Tub Water Treatment and TestingOfficial formula, rate, or program guidance used by this calculator. Reviewed 2026-08-14.
Related construction calculators
Frequently asked questions
How does the Pool Volume Calculator work?
Average depth = (shallow depth + deep depth) ÷ 2. Rectangular volume = length × width × average depth; circular volume = π × radius² × average depth; convert ft³ to US gallons by multiplying by 7.48051948.
What information should I enter in the Pool Volume Calculator?
Enter pool shape, plan dimensions in feet, and shallow and deep depths in feet, then verify actual waterline dimensions, benches, steps, irregular transitions, freeboard, and measurement uncertainty.
What should I verify before using this Pool Volume Calculator result?
Depth changes are approximated by an arithmetic average and the selected plan shape does not account for curved walls or displaced structures.
Reviewed 2026-08-14 · 1.0.0 · content-2026-08-14 · Trusty Calculator Editorial Team