Volume conversions hide a trap most converters gloss over: “gallon” means two different sizes depending on where you’re standing. Our new Volume Converter is explicit about which one it uses, and shows the full picture in one table.
- Eight units, one input — milliliters, liters, cubic meters, and US gallons, quarts, pints, cups, and fluid ounces, with a swap button to flip the “from” and “to” units instantly.
- Exact factors, not rounded ones — a US gallon is defined as 231 cubic inches, which works out to exactly 3.785411784 liters; every other US unit here is a fixed fraction of that same gallon, so nothing drifts from chained rounding.
- US, labeled honestly — every US unit is marked “US” throughout, because a US gallon (3.785411784 L) is meaningfully smaller than a UK/imperial gallon (about 4.54609 L). This tool converts the US version and says so, instead of presenting “gallon” as if it were universal.
- A live reference table — every conversion also shows the same value in all eight units at once, so you can see gallons, quarts, pints, cups, and fluid ounces together without re-running anything.
- Private by default — the conversion is multiplication and division that runs entirely in your browser; nothing you type is sent to a server.
Try it with 1 US gallon: the reference table shows 4 quarts, 8 pints, 16 cups, and 128 fluid ounces, all at once — the internal consistency you’d expect from a single, exact definition.