Gallon to mL Converter
Convert gallons to milliliters for precise liquid measurements and recipes.
1 Imperial gallon = 4,546.09 mL (about 20% larger)
Conversion Result
📐 Conversion Formulas
US Gallon to mL:
Imperial Gallon to mL:
Key Constants:
- 1 US gallon = 3,785.411784 mL (exactly 231 cubic inches)
- 1 Imperial gallon = 4,546.09 mL (defined as 10 lbs of water)
- 1 liter = 1,000 mL
📝 Step-by-Step Calculation
Enter a value and convert to see the step-by-step breakdown.
Understanding Gallons and Milliliters
US Gallon
The US gallon is defined as exactly 231 cubic inches, which equals 3,785.411784 mL. This definition dates back to the English wine gallon of 1707. The US gallon is used for liquid measurements in the United States.
Imperial Gallon
The Imperial gallon was redefined in 1824 as the volume of 10 pounds of water at 62°F, which equals 4,546.09 mL. It's used in the United Kingdom and some Commonwealth countries.
Why Convert to Milliliters?
Milliliters provide precision for:
- Medicine dosing: Precise measurements are critical
- Scientific work: Metric system is standard
- International recipes: Most countries use metric
- Cooking accuracy: Small volumes need precision
Quick Reference Table
Common gallon to mL conversions:
| US Gallons | mL | Liters | US Fluid Oz |
|---|---|---|---|
| 0.25 | 946 | 0.95 | 32 |
| 0.5 | 1,893 | 1.89 | 64 |
| 1 | 3,785 | 3.79 | 128 |
| 2 | 7,571 | 7.57 | 256 |
| 3 | 11,356 | 11.36 | 384 |
| 5 | 18,927 | 18.93 | 640 |
| 10 | 37,854 | 37.85 | 1,280 |
Frequently Asked Questions
1 US gallon = 3,785.41 mL. 1 Imperial gallon = 4,546.09 mL. The Imperial gallon is about 20% larger than the US gallon.
For US gallons, multiply by 3,785.41. For Imperial gallons, multiply by 4,546.09. Example: 2 US gallons × 3,785.41 = 7,570.82 mL.
A US gallon is 3,785.41 mL, while an Imperial gallon is 4,546.09 mL. The difference is 760.68 mL—the Imperial gallon is about 20% larger.
Half a US gallon is 1,892.7 mL (about 1.89 liters). Half an Imperial gallon is 2,273 mL (about 2.27 liters).
The US gallon is defined as exactly 231 cubic inches. Since 1 inch = 2.54 cm exactly, 231 in³ = 231 × (2.54)³ cm³ = 3,785.411784 mL.
Divide mL by 1,000 to get liters, or multiply US gallons by 3.785 directly. 1 US gallon = 3.785 liters. 1 Imperial gallon = 4.546 liters.
