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Free Water Volume Converter

Instantly convert pool water volume between gallons, liters, cubic feet, and cubic meters.

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Quick Conversions

Common pool volumes:

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See equivalent values in all common units.

Water Volume Converter

Pool professionals frequently need to convert water volumes between different measurement systems. This free converter instantly translates pool volume into gallons, liters, cubic feet, cubic meters, and imperial gallons.

Common Volume Conversions

Here are the key conversion factors for pool water volume:

US Gallons

  • 1 US gallon = 3.785 liters
  • 1 US gallon = 0.1337 cubic feet
  • 1 US gallon = 0.00379 cubic meters
  • 1 US gallon = 0.833 UK (imperial) gallons
  • 1 US gallon of water weighs 8.34 lbs

Cubic Feet

  • 1 cubic foot = 7.48 US gallons
  • 1 cubic foot = 28.32 liters
  • 1 cubic foot = 0.0283 cubic meters
  • 1 cubic foot of water weighs 62.4 lbs

Liters

  • 1 liter = 0.264 US gallons
  • 1 liter = 0.0353 cubic feet
  • 1 liter = 0.001 cubic meters
  • 1 liter of water weighs 1 kg (2.2 lbs)

Why Volume Conversions Matter

Chemical Dosing

Most pool chemicals are dosed per 10,000 gallons in the US, but international products use liters or cubic meters. Accurate conversion ensures proper dosing.

Equipment Sizing

Pumps, filters, and heaters may be rated in different units depending on manufacturer origin. Converting helps you compare specifications.

Water Costs

Water utilities may bill in gallons, cubic feet, or cubic meters. Converting your pool volume to the billing unit helps estimate fill costs.

Typical Pool Volumes

  • Small above-ground (15' round): ~5,000 gallons / 19,000 liters
  • Medium above-ground (24' round): ~13,000 gallons / 49,000 liters
  • Small in-ground (12' × 24'): ~10,000 gallons / 38,000 liters
  • Standard in-ground (16' × 32'): ~20,000 gallons / 76,000 liters
  • Large in-ground (20' × 40'): ~30,000 gallons / 114,000 liters
  • Olympic pool: ~660,000 gallons / 2,500,000 liters

Water Weight Considerations

Water weight is important for structural calculations, especially for above-ground pools and rooftop installations:

  • Water weighs 8.34 lbs per US gallon
  • A 20,000-gallon pool holds 166,800 lbs (83.4 tons) of water
  • Water weighs 1 kg per liter (1,000 kg per cubic meter)

Volume Converter FAQs

How many liters in a gallon?

There are approximately 3.785 liters in one US gallon. One UK (imperial) gallon equals about 4.546 liters.

How do I convert cubic feet to gallons?

Multiply cubic feet by 7.48 to get US gallons. For example, 1,000 cubic feet = 7,480 gallons.

What's the difference between US and UK gallons?

A UK (imperial) gallon is about 20% larger than a US gallon. 1 UK gallon = 1.2 US gallons = 4.546 liters.

How heavy is pool water?

One US gallon of water weighs 8.34 pounds. A 20,000-gallon pool contains over 83 tons of water.

Why do some products use metric measurements?

International manufacturers and many scientific applications use the metric system. Pool equipment and chemicals from Europe, Australia, or Asia typically use liters and cubic meters.

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