Pool Volume Calculator
Knowing your pool's volume in gallons is the starting point for dosing chemicals and sizing a pump or heater. Pick the shape, enter the dimensions and the average depth, and this gives the gallons.
Volume
17,235gallons
- Volume
- 65,242 liters
How it’s calculated
Gallons = surface area × average depth × 7.48 (gallons per cubic foot). Surface area is length × width for a rectangle, π × (diameter ÷ 2)² for a round pool, and π × (length ÷ 2) × (width ÷ 2) for an oval. Average depth is the shallow and deep depths averaged.
Worked example
A 32 × 16 ft rectangular pool, 3 ft at the shallow end and 6 ft at the deep end (average 4.5 ft): 512 sq ft × 4.5 × 7.48 ≈ 17,240 gallons.
FAQs
- How do I find the average depth?
- Add the shallow-end and deep-end depths and divide by two — a pool 3 ft shallow and 9 ft deep averages 6 ft. That's exact only when the bottom slopes evenly end to end. If yours has a big flat shallow area and a separate deep end (a “hopper” bottom), the true average is closer to the shallow depth, so this reads high — measure the average depth directly if you're dosing chemicals off it.
- Why do I need my pool's volume?
- Chemical doses (chlorine, shock, algaecide) and pump/heater sizing are all per gallon, so an accurate volume keeps you from over- or under-treating the water.
- How accurate is this for a kidney or freeform pool?
- It's an estimate — treat an irregular pool as the closest shape, or split it into sections, add the areas, and use the average depth. Pool chemistry has enough margin for a close estimate.
Sources
- Gallons = surface area × average depth × 7.48 gal/cu ft. Areas: rectangle L×W; round π(d/2)²; oval π(L/2)(W/2). 7.48052 US gallons per cubic foot (exact).