Volume Converter

Convert between liters, gallons (US/UK), milliliters, cubic meters, fluid ounces, and cups.

Result

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How to use the Volume Converter

  1. Enter the value you want to convert.
  2. Choose the unit you are converting from.
  3. Choose the unit you are converting to (L, mL, US/UK gallon, m³, fl oz or cup).
  4. The result updates instantly; use swap to reverse the direction.

Conversion factors

1 US gallon = 3.785 L  |  1 UK gallon = 4.546 L  |  1 m³ = 1,000 L  |  1 US fl oz = 29.57 mL

Litres and millilitres are metric; gallons, fluid ounces and cups are customary units that differ between the US and UK.

Worked example

Common conversions

10 litres = 2.64 US gallons = 2.20 UK gallons

1 m³ of water = 1,000 L ≈ 264 US gallons

A 500 mL bottle = 16.9 US fl oz

Water tanks and volume

To size a water tank, multiply length × width × height in metres to get cubic metres, then multiply by 1,000 for litres. A tank 1.5 m × 1 m × 1 m holds 1,500 litres. Overhead tanks in India are commonly sold in 500, 1,000 and 2,000 litre sizes. One litre of water weighs about 1 kg, which matters for roof load.

Tips for accurate results

  • Always check whether a recipe or spec uses US or UK gallons.
  • 1 litre = 1,000 cm³ = 1 dm³.
  • For cooking amounts like cups and spoons, the cooking converter is more convenient.

Frequently Asked Questions

3.785 litres in a US gallon and 4.546 litres in a UK gallon.

1,000 litres.

A US cup is about 236.6 mL; a metric cup is 250 mL.

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Content reviewed by Vinod, Easy Smart Calculator · Last updated October 2026