1 US gallon = 3.785411784 litres
The trap in fluid conversion is that US and Imperial measures share names but not sizes: an Imperial pint is 568.26 mL against the US 473.18 mL, roughly a 20 percent difference, and the same gap runs through fluid ounces and gallons. This converter lists the two systems as distinct units so a recipe or fuel figure cannot be silently mixed. Cooking units follow the US legal definitions.
Formula litres = US gallons × 3.785411784
| US gallon | Litre |
|---|---|
| 1 gal | 3.785412 L |
| 2 gal | 7.570824 L |
| 3 gal | 11.356235 L |
| 5 gal | 18.927059 L |
| 10 gal | 37.854118 L |
| 25 gal | 94.635295 L |
| 50 gal | 189.270589 L |
| 100 gal | 378.541178 L |
| 250 gal | 946.352946 L |
| 500 gal | 1892.705892 L |
| 1000 gal | 3785.411784 L |
Related guides: Imperial vs metric: differences and quick conversion tricks · How to scale a recipe up or down: the maths and the science · Top 20 liquid ingredients in cooking and how to measure them · US vs UK weights and measures: gallons, pints and tons