Why are US and Imperial gallons different sizes?

The US gallon (3.785411784 liters) and the Imperial gallon (4.54609 liters, used in the UK and some Commonwealth countries) developed from different historical standards and were never unified — the Imperial gallon is roughly 20% larger, which matters significantly for anything measured in gallons across the two systems, like fuel economy comparisons.

Does this use US or UK definitions for cups and fluid ounces?

This tool uses US customary definitions throughout (US cup, US fluid ounce, US pint, US quart, US gallon) alongside the metric units and the Imperial gallon specifically — the most common combination needed for US recipe conversion and general international volume conversion.

Why is a US cup exactly 236.5882365 milliliters?

This is the precise, legally defined US customary cup measurement, derived from its exact relationship to the US gallon (1 gallon = 16 cups). It's a specific, non-round metric value precisely because it was defined based on the pre-existing imperial system's internal fractions, not designed to align cleanly with metric units.

Can I use this for cooking measurement conversion?

Yes — this tool works for general and cooking volume conversion alike, though the dedicated Cooking Measurement Converter is scoped specifically to the units that actually show up in recipes (teaspoons through gallons), which may be a more focused fit for kitchen use specifically.

Why is cubic meter included alongside liter?

For larger volumes — a shipping container, a water tank, a room's air volume — liters become an unwieldy unit requiring very large numbers, so cubic meters (1 m³ = 1,000 liters) provide a more practical scale for bulk volume contexts.

Gallons to Liters Converter

Convert US Gallons to Liters Instantly

Need to use Gallons to Liters Converter right now?

Converting gallons to liters comes up for fuel tank capacity, water container sizes, and any large-volume comparison between the US gallon system and the metric liter standard used elsewhere. This tool converts instantly.

No sign-upNo uploads 100% free

Value

Result

0.2642

1 Liters (l) equals

1,000 Milliliters (ml)

0.001 Cubic meters (m³)

0.2642 US gallons (gal)

1.0567 US quarts (qt)

2.1134 US pints (pt)

4.2268 US cups

33.814 US fluid ounces (fl oz)

0.22 Imperial gallons

Features

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Works on desktop, tablet, and mobile
No installation needed

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About Gallons to Liters Converter

Volume measurement splits across metric units (milliliters, liters, cubic meters) and several distinct US customary units (gallons, quarts, pints, cups, fluid ounces) — and even within the imperial family, US and UK (Imperial) gallons are genuinely different sizes, a common source of confusion when converting fuel economy or liquid volume figures across countries.

This tool converts between nine common volume units, using US customary definitions for gallon, quart, pint, cup, and fluid ounce (the versions most commonly referenced online and in US recipes and products), plus the separately defined Imperial gallon for UK/Commonwealth contexts. A US gallon (3.785411784 liters) is meaningfully smaller than an Imperial gallon (4.54609 liters) — roughly 17% smaller — which matters for accurate cross-border conversions.

The cubic meter is included as the large-scale metric unit, useful for shipping container volumes, room or tank capacity, and other bulk volume contexts where liters become an unwieldy unit to work with directly.

This is useful for cooking with recipes from a different country, comparing fuel tank or container capacities across US and UK/metric specifications, chemistry or lab work requiring precise volume conversion, or any situation needing to convert between these overlapping systems accurately.

How it works

Enter a volume value and select its unit. Any of the nine supported volume units.
Select the target unit. Or use the swap button to reverse direction.
View the exact converted result. Plus the value in every other supported unit at once.

Examples

Liters to US gallons

Input

1 liter

Output

0.264172 US gallons

US cups to milliliters