Gallons to Liters Converter
Convert US gallons to litres. 1 US gal = 3.78541 L.
Pre-filled to convert US gallons to litres. One US liquid gallon equals 3.78541 litres. Switch to UK gallons in the dropdown if your source is British (1 UK gal = 4.54609 L).
How to use it
Pick a category
Choose length, weight, temperature, volume, area, or speed. The unit dropdowns refresh to match.
Pick source and target units
Pick the unit you have and the unit you want. The swap button mirrors the conversion if you got them backwards.
Type the value
Type a number - the converted value updates instantly. Six significant digits are shown.
What is it?
A unit converter translates a quantity from one unit of measure to another using the SI base unit as the pivot. Length, weight, temperature, volume, speed and area are the categories that account for ~95% of search demand. The arithmetic is trivial for most categories (multiply by a constant); temperature is special because the scales have different zero points, so an offset is applied before and after the scaling factor.
When to use it
Whenever a measurement crosses a metric/imperial boundary: translating European recipe quantities to American cups, comparing American weather forecasts to European ones, converting marathon distances between countries, sizing furniture from a German manufacturer for a US apartment. Also useful in technical contexts: aviation (metres ↔ feet for altitude), shipping (kilograms ↔ pounds), engineering (Pa ↔ psi).
Common mistakes
Confusing the two definitions of a 'ton' (metric ton = 1000 kg vs. US short ton = 907 kg). Treating US and UK gallons as the same - they differ by ~17%. Forgetting that fluid ounces are a volume in one system and a weight in another. And rounding too aggressively when the result will be chained into another calculation.
FAQ
- How accurate is this converter?
- We use the SI base unit definitions. Conversions are accurate to JavaScript's full double-precision floating-point range - more than enough for any practical use.
Unit Converter
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