How this calculator works
US customary liquid measures and Imperial measures differ. This tool labels both explicitly. The US customary cup is 236.5882365 mL, not the 240 mL US nutrition-label cup or a 250 mL metric cup. Dry measures are excluded.
The formula
Base amount = value × source factor
Target amount = base amount / target factorA quick example
1 US liquid gallon = 3.785411784 L; 1 Imperial gallon = 4.54609 L.
How to use this calculator
- Enter a value using a decimal point.
- Choose the source and target units.
- Read the live result or swap units to reverse the direction.
A few common questions
Which convention does this converter use?
US customary liquid measures and Imperial measures differ. This tool labels both explicitly. The US customary cup is 236.5882365 mL, not the 240 mL US nutrition-label cup or a 250 mL metric cup. Dry measures are excluded.
Can I reverse the conversion?
Yes. Swap exchanges the units, keeps your input amount and calculates again.
Why is the displayed result rounded?
The calculation uses the full stored factor. Results show up to six decimal places, with scientific notation for very small or large amounts.
Reference: NIST conversion factors