What this tool does
Converts between all major volume units: metric (L, mL, m³, cm³) and imperial/US customary (US gal, UK gal, fl oz, cups, pints, quarts, cubic feet).
Converter and calculator
Volume Converter
Convert between litres, millilitres, gallons (US and UK), cubic metres, cubic feet, fluid ounces, cups, pints, and quarts.
Complete guide
How to use Volume Converter
Unit converters guide for volume converter users.
Volume units vary by region and context: litres for most countries, US gallons for fuel in America, UK imperial gallons for older British measurements, cubic metres/feet for engineering and construction. This converter handles all of them.
US vs UK gallons
US gallon = 3.785 L. UK imperial gallon = 4.546 L. They differ by about 20% — always check which system is being used.
How to use it
Enter a value in any unit. All others update instantly.
Quick checklist
- US gallon ≠UK gallon — 1 UK gal = 1.201 US gal.
- 1 litre = 1,000 mL = 0.264 US gal = 0.220 UK gal.
- 1 US fl oz = 29.57 mL. 1 UK fl oz = 28.41 mL.
- Cubic metre (m³) = 1,000 litres. Cubic foot = 28.32 litres.
Answers
Volume Converter FAQs
How many litres in a US gallon?
1 US gallon = 3.78541 litres.
How many litres in a UK (imperial) gallon?
1 UK gallon = 4.54609 litres.
What is the difference between a US and UK gallon?
A UK gallon is about 20% larger than a US gallon. 1 UK gal = 1.201 US gal.
How many mL in a teaspoon?
1 US teaspoon = 4.929 mL. 1 metric teaspoon = 5 mL exactly.