Gallons to liters, cups to milliliters - with US and imperial versions listed as the genuinely different units they are, and all four cup standards labeled separately.
| From | Equals |
|---|---|
| 1 gallon (us) | 3.785411784 L |
| 1 litre | 0.2641720524 gal |
| 1 fluid ounce (us) | 29.57352956 mL |
| 1 cup (us customary) | 236.5882365 mL |
| 1 pint (us) | 0.473176473 L |
| 1 gallon (imperial) | 4.54609 L |
| 1 cubic metre | 35.31466672 ft³ |
| 1 tablespoon (us) | 14.78676478 mL |
Every value in this table is computed by the same conversion engine as the tool above - not typed in by hand - so the tool and the table can never disagree.
The US gallon is exactly 3.785411784 liters (231 cubic inches - a definition dating to the British wine gallon of 1707). The imperial (UK) gallon is exactly 4.54609 liters - about 20% bigger. Every related unit splits the same way: a US pint is 473 ml, an imperial pint 568 ml; a US fluid ounce is 29.57 ml, an imperial one 28.41 ml. If a recipe, a fuel economy figure, or a barrel price seems off by roughly a fifth, this is almost always why. (Fuel economy across the two gallons has its own comparator.)
The US customary cup is about 236.6 ml, the US "legal" cup (used on nutrition labels) is exactly 240 ml, the metric cup used in Australia and New Zealand is 250 ml, and older UK recipes used an imperial cup of 284 ml. This converter includes all of them as separate, labeled units rather than pretending "cup" means one thing. For cooking specifically - where the difference actually changes a recipe - the cooking volume converter and ingredient converter handle it ingredient by ingredient.
The commodity units are exact too: the oil barrel is exactly 42 US gallons (158.987 liters), the US bushel is 2,150.42 cubic inches (the historic Winchester bushel), and the board foot - lumber's volume unit - is a 12″ × 12″ × 1″ slab. All verified against their defining documents, all in the list above.