Volume Converter
Enter a volume, pick the units, and get an instant conversion — plus the same value shown in all eight units at once. Nothing you type ever leaves your browser.
Same value in all eight units
Why this page defaults from US gallons
Every unit stays fully selectable in the dropdowns above — this is just the starting pair. US gallons are the everyday volume unit for fuel, milk, and recipes in the United States, so that's the default "from" unit here; readers who want Liters→Gallons or any other pairing can just change the dropdowns. Note the "US" label throughout: a US gallon (3.785411784 L) is a different, smaller unit than the UK/imperial gallon (about 4.54609 L) — this tool only converts the US version, and says so explicitly rather than presenting "gallon" as if it were a single universal unit.
Worked example
1 US gallon equals exactly 3.785411784 liters,
and because every US unit here is a fixed fraction of that same
gallon, the smaller units come out to clean whole numbers: 1 US
gallon = 4 US quarts = 8 US pints = 16 US cups = 128 US fluid ounces.
Enter 1 with US gallons as the "from" unit above and
check the reference table — every one of those figures shows up
at once.
Frequently asked questions
Is a US gallon the same as a UK (imperial) gallon?
No — they're different units that happen to share a name. This tool uses the US liquid gallon (3.785411784 L), which is what's used for fuel, milk, and recipes in the United States. The UK/imperial gallon is larger, at about 4.54609 L — roughly 20% more. If you're converting a figure from a UK source, don't assume "gallon" here matches it; that's exactly the kind of silent mix-up this tool avoids by always labeling US units explicitly.
Where does the 3.785411784 L figure for a US gallon come from?
It's not a rounded approximation — it's the exact legal definition. A US gallon is defined as 231 cubic inches, and converting that figure to liters using the exact inch-to-centimeter definition (1 inch = 2.54 cm) gives 3.785411784 L precisely. Every other US unit here (quart, pint, cup, fluid ounce) is a fixed fraction of that same gallon, so they're all exact too, not independently rounded.
How many liters are in a cubic meter?
Exactly 1,000 — a cubic meter is defined as a cube 1 meter on each side, and a liter is defined as exactly 1/1000 of a cubic meter (equivalently, a cube 10 cm on each side). It's the one unit here large enough to be useful for things like water tanks, shipping volume, or a car's cargo space.
Is my input sent anywhere?
No. The conversion is plain multiplication and division that runs in your browser — nothing you type is sent to a server, stored, or logged. That's true for every tool on this site.