Gallons to Liters Converter

Convert US gallons (gal) to liters (L) instantly and accurately.

Convert gallons to liters instantly with this free online tool. Type a volume in US gallons and see the equivalent in liters right away, or type liters to convert back. Everything runs in your browser — no sign-up and no waiting.

How to convert gallons to liters

To convert US gallons to liters, multiply the number of gallons by 3.785411784, because one US liquid gallon is defined as exactly 3.785411784 liters. For example, 5 gallons × 3.785411784 = 18.92706 liters. This converter does the math for you and updates as you type.

  1. Enter the volume in US gallons in the first field.
  2. Read the result in liters in the second field.
  3. Type into the liters field to convert in the other direction.

Why use this gallons to liters converter?

  • 100% free with no ads, sign-up, or limits.
  • Instant, two-way conversion as you type.
  • Uses the exact US liquid gallon (3.785411784 liters).
  • Runs entirely in your browser.

Frequently asked questions

What is the formula to convert gallons to liters?

Liters = US gallons × 3.785411784. Equivalently, multiply liters by 0.264172 to get gallons.

How many liters is 1 gallon?

1 US liquid gallon is exactly 3.785411784 liters, about 3.79 liters.

How do I convert 5 gallons to liters?

Multiply 5 by 3.785411784 to get about 18.92706 liters.

Does this use US or imperial gallons?

This converter uses the US liquid gallon (3.785411784 liters). The imperial (UK) gallon is larger, at about 4.546 liters.