Volume Converter — Free
Runs 100% in your browser — your files never leave your device.
Recipes count cups and fluid ounces, bottles label milliliters and liters, and fuel tanks measure gallons. This converter joins the eight common US and metric volume measures so you can move between them without a conversion chart.
How it works
- 1
Pick the unit on your label
Milliliters, cups, gallons — whichever one you already have.
- 2
Type the amount
The other seven units update instantly.
- 3
Scale the recipe or the tank
Halving, doubling, and metric-to-imperial swaps all read off one grid.
About this tool
The US gallon is exact
One US gallon is 231 cubic inches — exactly 3.785411784 liters — and the smaller measures are clean divisions of it: a cup is half a liquid pint, a pint is half a quart, a gallon is four quarts. Because the definitions are exact, conversions never drift.
US and UK are not the same cup
The British Imperial gallon is 4.54609 liters — about 20 percent larger than the US gallon — so an Imperial pint is not a US pint. This page uses the US legal measures that label American recipes and bottles; check which side of the Atlantic a cookbook measures from before scaling it.
Frequently asked questions
Is a UK gallon the same as a US gallon?
No. The UK Imperial gallon is 4.546 liters against the US 3.785, so a car that returns 40 mpg in Britain gets about 33 on the US scale. Always check which gallon a figure uses.
How many milliliters is a cup?
A US legal cup is 236.588 milliliters; many metric cookbooks round a cup to 240 or even 250. For baking, weigh ingredients instead of pouring.
Do cups measure dry ingredients the same way?
Volume-wise yes, but a cup of flour and a cup of sugar weigh very different amounts — weight lives on the weight converter.