How many liters is 1 gallon?

1 US gallon is approximately 3.785 liters.

Are US and UK gallons different?

Yes. 1 US gallon = 3.785 L while 1 UK gallon = 4.546 L — about 20% larger. Always distinguish them in fuel calculations.

How many mL is one baking cup?

A US standard cup = 236.59 mL, which differs from the 200 mL measuring cups common in Korea and Japan.

🧪 Volume Converter

Convert liters, gallons, cups, milliliters and more instantly.

How it works

Type a value in the left field.
Pick the units to convert from and to.
The result updates instantly, with a full reference table below.

Key units & conversion basis

Volume units are converted through liters (L). US and UK gallons differ by ~20%, and cooking cups/spoons also vary by standard — choose units carefully.

Unit	Symbol	In liters	Common use
Liter	L	1 L	drinks, fuel
Milliliter	mL	0.001 L	recipes, doses
Gallon (US)	gal	3.7854 L	US fuel, milk
Gallon (UK)	UK gal	4.5461 L	UK labels
Cup (US)	cup	0.2366 L	baking
Fluid ounce	fl oz	0.0296 L	drink sizes
Tablespoon	tbsp	0.0148 L	cooking

🧮 How the conversion is calculated

Example: 2 US gallons to liters → 2 × 3.7854 = 7.571 L. The same 2 UK gallons would be 9.092 L — a different value.

🎯 When to use this

Convert cups and gallons in foreign recipes to liters
Convert car fuel tank capacity (gallons)
Convert milliliters and liters for lab or chemistry use
Convert cups, tablespoons, and fluid ounces in foreign recipes to mL

📖 Guide: Converting Gallons to Liters — US Gallon vs UK Gallon →

Frequently Asked Questions

How many liters is 1 gallon?: 1 US gallon is approximately 3.785 liters.
What cup size is used?: The US legal cup (~236.6 mL).
Are US and UK gallons different?: Yes. 1 US gallon = 3.785 L while 1 UK gallon = 4.546 L — about 20% larger. Always distinguish them in fuel calculations.
How many mL is one baking cup?: A US standard cup = 236.59 mL, which differs from the 200 mL measuring cups common in Korea and Japan.