Gallons to Liters Converter
Enter the volume in gallons below to convert it to liters.
Convert Gallons (US) to Liters
Enter a value in gallons (us) (gal (US)) to convert to liters (L).
Gallon to Liter Conversion Table
Table showing various gallon measurements converted to liters. Click any preset value or arrow to load it into the converter.
| Gallons (US) (gal (US)) | Liters (L) |
|---|---|
| 1 gal (US) | 3.7854118 L |
| 2 gal (US) | 7.5708236 L |
| 5 gal (US) | 18.9270589 L |
| 7.5 gal (US) | 28.3905884 L |
| 10 gal (US) | 37.8541178 L |
| 15 gal (US) | 56.7811768 L |
| 20 gal (US) | 75.7082357 L |
| 25 gal (US) | 94.6352946 L |
| 30 gal (US) | 113.5623535 L |
| 50 gal (US) | 189.2705892 L |
How to Convert Gallons to Liters
To convert gallons to liters, multiply the volume by the following conversion ratio: 3.7854118 liters/gallon.
Since one gallon is equal to 3.7854118 liters, you can use this simple formula to convert:
The volume in liters is equal to the volume in gallons multiplied by 3.7854118.
For example, here's how to convert 15 gallons to liters using the formula above.
How Many Liters Are in a Gallon?
There are 3.7854118 liters in a gallon, which is why we use this value in the formula above.
Our gallon to liter calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Gallons and liters 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 3.7854118 liters (L), the base unit for volume. US liquid gallon defined as exactly 231 cubic inches (3.78541 L). [1]
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.
What Is a Liter?
Metric unit of volume equal to 1 cubic decimeter (1,000 mL). It serves as a primary reference unit for measuring volume across scientific and practical applications. [2]
The liter is classified as a metric and SI-compatible unit of volume. Liters can be abbreviated as L; for example, 1 liter can be written as 1 L.
As the primary coherent reference unit for volume in this category, all other volume units are mathematically anchored to the liter (L).
In practice, liters (L) are widely used across standard volume applications within SI metric workflows, engineering documentation, and technical data sheets.
When converting volume between gallons (gal (US)) and liters (L), keep full floating-point precision (1 gal (US) = 3.7854118 L; 1 L = 0.2641721 gal (US)) during intermediate calculations and round only the final liter figure to match your instrument tolerance.
More Gallon & Liter Conversions
Need to calculate in the opposite direction? Use our liters to gallons (us) converter (L to gal (US)) to switch your starting unit immediately. You can also explore related tools such as converting cups (us) to liters, converting quarts (us) to liters, or converting gallons (us) to quarts (us).
Convert from Gallons
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Volume)·Volume & Liquid Metrology Standard — Gallons (US) (gal (US)) to Liters (L)
- [2]NIST HB 44 SpecificationNIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Gallon (US Liquid) (gal (US)) & Liter (L)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (gal (US) to L)