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Gallons to Liters
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// about this tool

Gallons to Liters Online

Updated 2026-07-26

Convert US gallons to liters online for free. Enter a volume in gallons and SnapTools shows the exact value in liters instantly, in your browser — nothing is uploaded.

The gallon is a US-specific everyday unit — fuel tanks, milk jugs, paint cans — while nearly everywhere else measures volume in liters. This converter handles the exact US-gallon figure (not the larger UK gallon) so a tank capacity, a recipe, or a fuel-economy number converts correctly. For the full family of volume units — milliliters, cups, pints, the UK gallon — use the Volume Converter.

// how to use

  1. 1 Type or paste a volume in US gallons into the input.
  2. 2 SnapTools converts it to liters as you type.
  3. 3 Copy the result, or use the slider for a quick scrub across common tank/container sizes.

// examples

A car fuel tank
Input
12
Output
45.42 L
A US gallon of milk
Input
1
Output
3.79 L

// common uses

Converting US fuel-tank capacity or fuel economy to liters Scaling a US recipe measured in gallons to a metric kitchen Comparing US container/tank sizes to metric equivalents Checking a manual volume conversion

// faq

Is my input uploaded to a server?
No. The conversion runs entirely in your browser, so nothing you enter leaves your machine.
Is this the US gallon or the UK (imperial) gallon?
The US gallon — the one used for fuel, groceries, and recipes in the US. The full Volume Converter also offers the UK gallon (Gallon UK), which is about 20% larger.
What's the exact conversion factor?
1 US gallon is exactly 3.785411784 liters. This tool uses the exact figure throughout.
Why would I need this for fuel economy?
US fuel economy is measured in miles per gallon; most of the world uses liters per 100 km. Converting the gallon figure is the first step in comparing the two.
What about converting liters back to gallons?
Use Liters to Gallons, or the full Volume Converter for milliliters, cups, pints, and more.

// works with your data

Liters to Gallons Volume Converter Square Feet to Square Meters Number Base Converter PX to REM Converter

Use this via API

Get a free API key → 
curl -X POST https://thesnaptools.com/api/v1/tools/gallons-to-liters \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"value":"12"}'
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