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Pool Volume Calculator

Calculate pool water capacity in gallons and liters for rectangular, oval, and round pools with pump flow rate recommendations.

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How to Use the Pool Volume Calculator – Gallons & Water Capacity

1Select your pool shape: Rectangular, Oval, or Round.
2Enter the length and width (or diameter for round pools) in feet.
3Enter the shallow end depth and deep end depth in feet.
4Read the total water volume in gallons and liters along with the recommended 8-hour turnover pump GPM.

Formula & How It Works

Pool Geometry & Water Volume Formulas

Rectangular: L × W × AvgDepth × 7.4805 | Round: π × (r)² × AvgDepth × 7.4805

Average depth equals (Shallow Depth + Deep Depth) / 2. Surface area is multiplied by average depth to obtain cubic feet. Cubic feet are converted to US liquid gallons using the factor of 7.48052 gallons per cubic foot (1 gallon ≈ 3.7854 liters).

Worked Examples

Standard Inground Rectangular Pool

Input: 32 ft long, 16 ft wide, 3.5 ft shallow, 7.5 ft deep

Explanation: Surface = 512 sq ft. Avg depth = 5.5 ft. Volume = 2,816 cu ft × 7.48052 = 21,065 gal.

Result: 21,065 Gallons (79,740 Liters, 2,816 cu ft, Pump: 44 GPM)

Round Above-Ground Backyard Pool

Input: 24 ft diameter, uniform 4.5 ft depth

Explanation: Radius = 12 ft. Area = π × 144 = 452.39 sq ft × 4.5 ft = 2,035.75 cu ft × 7.48052 = 15,229 gal.

Result: 15,229 Gallons (57,649 Liters, 2,036 cu ft, Pump: 32 GPM)

Oval Inground Pool

Input: 30 ft long, 15 ft wide, 3 ft shallow, 6 ft deep

Explanation: Oval area = π × 15 × 7.5 = 353.43 sq ft × 4.5 ft avg depth = 1,590.4 cu ft × 7.48052 = 11,993 gal.

Result: 11,993 Gallons (45,398 Liters, 1,603 cu ft, Pump: 25 GPM)

Small Inground Plunge Pool

Input: 12 ft long, 8 ft wide, uniform 4 ft depth

Explanation: 96 sq ft × 4 ft = 384 cu ft × 7.48052 = 2,873 gal.

Result: 2,873 Gallons (10,874 Liters, 384 cu ft, Pump: 6 GPM)

Frequently Asked Questions

How do you calculate average depth for a pool?▼

Add the shallow end depth to the deep end depth and divide by 2: Average Depth = (Shallow + Deep) / 2.

How many gallons of water are in one cubic foot?▼

There are approximately 7.48052 US liquid gallons in one cubic foot of water.

Why is knowing pool volume critical for chemical dosing?▼

Pool chemicals like chlorine shock, algaecides, muriatic acid, and cyanuric acid are dosed strictly per 10,000 gallons of water to prevent under-treatment or dangerous chemical burns.

What does pump turnover GPM mean?▼

Turnover GPM is the pump flow rate (Gallons Per Minute) required to cycle the entire water volume through the filter within an 8-hour period: GPM = Volume / (8 × 60).

How does pool shape affect volume calculation?▼

Rectangular pools hold the maximum water for their footprint, oval pools hold approximately 78.5% of a rectangle of identical dimensions, and round pools follow the circular area formula πr².

Does this tool work completely client-side?▼

Yes, all calculation logic runs locally in your web browser with zero server latency.

Last reviewed & updated: 2026-11-01

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