Gallons to liters converter: US gallon in liters
1 US gallon is 3.78541 liters. To convert gallons to liters, multiply the number of gallons by 3.785411784.
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5 US gallons =
18.9271L
Formula: L = gal × 3.785411784
Show the steps
- Definition: 1 US gallon = 231 in³ = 3.785411784 L exactly; 1 L = 0.001 m³
- 5 gal × 3.785411784 = 18.9271 L
Definitions used: 1 US gallon = 231 in³ = 3.785411784 L exactly; 1 L = 0.001 m³.
Source: NIST Handbook 44 (2026), Appendix C and NIST SP 811, Appendix B.8, checked on .
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Copy a column of US gallons from Excel or Google Sheets, paste it on the left and copy the liters on the right back into your sheet. One result per line, in the same order.
5 values converted.
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How to convert US gallons to liters
Multiply the value in US gallons by 3.785411784. The factor follows from the definitions: 1 US gallon = 231 in³ = 3.785411784 L exactly, and 1 L = 0.001 m³.
L = gal × 3.785411784
Worked example: 5 gal to L
- Definition: 1 US gallon = 231 in³ = 3.785411784 L exactly; 1 L = 0.001 m³
- 5 gal × 3.785411784 = 18.9271 L
- Answer: 5 gal = 18.9271 L.
US gallons to liters chart
| US gallons (gal) | Liters (L) |
|---|---|
| 0.5 | 1.89271 |
| 1 | 3.78541 |
| 2 | 7.57082 |
| 3 | 11.3562 |
| 4 | 15.1416 |
| 5 | 18.9271 |
| 6 | 22.7125 |
| 8 | 30.2833 |
| 10 | 37.8541 |
| 15 | 56.7812 |
| US gallons (gal) | Liters (L) |
|---|---|
| 20 | 75.7082 |
| 25 | 94.6353 |
| 30 | 113.562 |
| 40 | 151.416 |
| 50 | 189.271 |
| 75 | 283.906 |
| 100 | 378.541 |
| 200 | 757.082 |
| 500 | 1,892.71 |
| 1,000 | 3,785.41 |
Values rounded to 6 significant digits. Type any other number in the converter at the top of the page.
How many liters are in a US gallon and in an imperial gallon?
A US liquid gallon is exactly 3.785411784 liters, defined as 231 cubic inches. An imperial (UK) gallon is larger: exactly 4.54609 liters. This page uses the US gallon.
How many liters is a 5-gallon bucket?
A 5-gallon bucket holds 18.9271 liters. A 20-liter jerrycan holds 5.28344 US gallons, a little more than five, so it is slightly bigger.
More questions about US gallons and liters
How many liters is 1 gallon?
1 US gallon is 3.785411784 liters.
How many liters are in 10 gallons?
10 US gallons is 37.8541 liters.
How many liters are in a 50-gallon tank?
A 50-gallon tank holds 189.271 liters.
How do I estimate liters from gallons in my head?
Multiply the gallons by 4 and take away a fifth of them: 10 gallons gives 40 − 2 = 38 liters, while the exact value is 37.8541 liters.
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Sources and limits
- NIST Handbook 44 (2026), Appendix C
NIST Handbook 44-2026, Appendix C: General Tables of Units of Measurement.
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
- NIST SP 811, Appendix B.8
NIST Special Publication 811, Guide for the Use of the SI, Appendix B.8: Factors for Units Listed Alphabetically (page updated August 18, 2025).
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
This is a calculation aid, not an official measurement service. Results are rounded to 6 significant digits for display. For trade, engineering, medical dosing or legal documents, confirm the figure in the official source. Nothing you type leaves your browser.