UTL
Volume Converter
Convert liquid volume between metric and US or Imperial units — type in either field and the other updates live.
How it's calculated
Every unit converts through milliliters as a common base. US and Imperial units are kept as separate categories because they're not the same size — a US gallon (3,785.41 ml) is noticeably smaller than an Imperial gallon (4,546.09 ml).
Frequently asked
Why are US and Imperial gallons different sizes?
They come from different historical standards. A US gallon is about 3.785 liters, while an Imperial gallon (used in the UK) is about 4.546 liters — roughly 20% larger. Always check which one a recipe or spec means.
Which should I use for a US recipe?
Use the US units category — US cups, tablespoons and teaspoons are all sized differently from their Imperial counterparts, not just the gallon.