Gallons to Gallons Converter
Enter the volume in gallons below to convert it to gallons.
Convert Gallons (UK) to Gallons (US)
Enter a value in gallons (uk) (gal (UK)) to convert to gallons (us) (gal (US)).
Gallon to Gallon Conversion Table
Table showing various gallon measurements converted to gallons. Click any preset value or arrow to load it into the converter.
| Gallons (UK) (gal (UK)) | Gallons (US) (gal (US)) |
|---|---|
| 1 gal (UK) | 1.2009499 gal (US) |
| 2 gal (UK) | 2.4018999 gal (US) |
| 5 gal (UK) | 6.0047496 gal (US) |
| 10 gal (UK) | 12.0094993 gal (US) |
| 15 gal (UK) | 18.0142489 gal (US) |
| 20 gal (UK) | 24.0189985 gal (US) |
| 25 gal (UK) | 30.0237481 gal (US) |
| 30 gal (UK) | 36.0284978 gal (US) |
| 50 gal (UK) | 60.0474963 gal (US) |
| 75 gal (UK) | 90.0712444 gal (US) |
How to Convert Gallons to Gallons
To convert gallons to gallons, multiply the volume by the following conversion ratio: 1.2009499 gallons/gallon.
Since one gallon is equal to 1.2009499 gallons, you can use this simple formula to convert:
The volume in gallons is equal to the volume in gallons multiplied by 1.2009499.
For example, here's how to convert 10 gallons to gallons using the formula above.
How Many Gallons Are in a Gallon?
There are 1.2009499 gallons in a gallon, which is why we use this value in the formula above.
Our gallon to gallon calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Gallons and gallons are both units used to measure volume. Keep reading to learn more about each unit.
What Is a Gallon?
A gallon is a unit of volume equal to 4.54609 liters (L), the base unit for volume. British Imperial gallon defined as exactly 4.54609 liters. [1]
The gallon is classified as a US customary and imperial unit of volume. Gallons can be abbreviated as gal (UK); for example, 1 gallon can be written as 1 gal (UK).
When working with gallons (gal (UK)) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, gallons (gal (UK)) are widely used across standard volume applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Gallon?
A gallon is a unit of volume equal to 3.7854118 liters (L), the base unit for volume. US liquid gallon defined as exactly 231 cubic inches (3.78541 L). [2]
The gallon is classified as a US customary unit of volume. Gallons can be abbreviated as gal (US); for example, 1 gallon can be written as 1 gal (US).
When working with gallons (gal (US)) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, gallons (gal (US)) are widely used across standard volume applications within US customary workflows, engineering documentation, and technical data sheets.
When converting volume between gallons (gal (UK)) and gallons (gal (US)), keep full floating-point precision (1 gal (UK) = 1.2009499 gal (US); 1 gal (US) = 0.8326742 gal (UK)) during intermediate calculations and round only the final gallon figure to match your instrument tolerance.
More Imperial Gallon & Gallon Conversions
Need to calculate in the opposite direction? Use our gallons (us) to gallons (uk) converter (gal (US) to gal (UK)) to switch your starting unit immediately. You can also explore related tools such as converting liters to gallons (us), converting quarts (us) to gallons (us), or converting gallons (uk) to liters.
Convert from Imperial Gallons
Weight and volume require ingredient density (g/mL). Choose a USDA FoodData Central verified ingredient below:
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Volume)·Volume & Liquid Metrology Standard — Gallons (UK) (gal (UK)) to Gallons (US) (gal (US))
- [2]NIST HB 44 SpecificationNIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Gallon (UK Imperial) (gal (UK)) & Gallon (US Liquid) (gal (US))
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (gal (UK) to gal (US))