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Pool Volume Calculator

Calculate your swimming pool volume in gallons and liters.

Last updated: June 13, 2026

Calculator

feet
feet
feet

Results

Volume16,831 gallons
Liters63,713 L
Cubic Feet2250.0 cu ft

How to Use This Calculator

  1. 1Select your pool shape (rectangular, round, or oval).
  2. 2Enter pool dimensions (length, width/diameter, depth).
  3. 3View pool volume in gallons, liters, and cubic feet.

Formula Explanation

Pool volume is calculated using standard geometric formulas and converted to gallons (1 cubic foot = 7.481 gallons).

Rectangular: L × W × AvgDepth × 7.481 Round: π × r² × AvgDepth × 7.481 Oval: π × (L/2) × (W/2) × AvgDepth × 7.481

Variables:

LPool length in feet
WPool width in feet
DepthAverage depth in feet

Worked Examples

Rectangular pool: 30ft × 15ft, avg depth 5ft

  1. 1. Volume = 30 × 15 × 5 = 2,250 cu ft
  2. 2. Gallons = 2,250 × 7.481 = 16,832 gallons
  3. 3. Liters = 16,832 × 3.785 = 63,711 liters
Result: 16,832 gallons (63,711 liters)

Why Use This Calculator

  • Calculate pool volume for chemical dosing.
  • Essential for proper chlorine and pH treatment.
  • Supports multiple pool shapes.
  • Know your water volume for heating cost estimates.
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Tips & Best Practices

  • Average depth = (shallow end + deep end) ÷ 2 for pools with a gradual slope.
  • You need to know your pool volume for accurate chemical treatment.
  • A typical residential pool holds 10,000-25,000 gallons.
  • Pool volume also helps estimate water cost for filling.

Common Mistakes to Avoid

❌ Using the deepest point instead of average depth.

✅ Use the average of shallow and deep ends. A pool that goes from 3ft to 8ft has an average depth of 5.5ft.

❌ Forgetting to convert between gallons and liters when reading chemical labels.

✅ Some chemical dosing instructions use gallons, others liters. 1 gallon = 3.785 liters. Always double-check units.

Frequently Asked Questions

How many gallons is a typical pool?
Small pools: 5,000-10,000 gallons. Average residential: 15,000-25,000 gallons. Large/commercial: 25,000-50,000+ gallons.
Why do I need to know my pool volume?
Pool volume is essential for calculating the correct amount of chlorine, pH adjusters, algaecide, and other chemicals. Under-dosing is ineffective; over-dosing can be dangerous.
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Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.

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