Unit Converters
Gallons to Liters Converter
Gallons to Liters — it converts US gallons to litres and back using 1 US gallon = 3.785411784 L. This page runs that same calculation on your numbers, in your browser: no signup, no uploads, nothing stored.
Enter your value plus the source and target units and Gallons to Liters Converter works out the converted volume in the unit you choose with fixed, standard conversion ratios — fast, free and private, with no sign-up or uploads.
Gallon, quart, pint, cup, fluid ounce, tablespoon and teaspoon use US liquid measures. One US gallon is 3.785411784 L; one cup is 16 tablespoons.
About this calculator
Get gallons to liters right and the rest of the task gets easier. It converts US gallons to litres and back using 1 US gallon = 3.785411784 L. It matters whenever the same quantity is expressed in two systems and a wrong factor silently breaks the answer. Convert 5 US gallons to litres: 5 × 3.78541 = 18.93 L (1 US gal = 3.78541 L). The tool above does the same computation in your browser — free, private, nothing stored.
How to use
- Enter the volume in gallons.
- From is preset to gal and To to l — change them if you need a different conversion.
- Press Calculate to convert gallons to litres.
- Read the gallons value converted to litres.
Why use Gallons to Liters Converter
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Accurate
Uses standard conversion factors where applicable. Check critical measurements before relying on the result.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Honest disclaimers wherever browser limits or regional rules apply.
Common uses
Use it when comparing measurements
Use it when a manual uses different units
Use it for quick technical conversions
Use it when reading a spec sheet
Use it for cross-checking a calculation
Gallons to Liters in design and manufacturing
Technical notes
Gallons to Liters Converter converts US gallons to litres and back using 1 US gallon = 3.785411784 L.
Conversions use standard reference factors; for trade or engineering tolerances keep more decimal places than the display shows.
Nothing you type is uploaded — the calculation happens entirely on your device.
FAQ
How do I convert gallons to litres?
Enter the value in gallons; the tool multiplies by the standard factor and shows litres.
Is the gal to l conversion exact?
It uses standard definitions (1 US gallon = 3.78541 L), so gal-to-l results are accurate to the digits shown.
Can I reverse it to litres to gallons?
Yes. Swap the From and To units to convert litres back to gallons.
Does the Gallons to Liters Converter send my data to a server?
No. The Gallons to Liters Converter runs entirely in your browser, so nothing you enter is uploaded, stored, or shared.
Worked example
Convert 5 US gallons to litres: 5 × 3.78541 = 18.93 L (1 US gal = 3.78541 L).