Volume Converter: Convert Liters, Gallons, Cups, and More
Volume conversion is a daily need in cooking, science, travel, and engineering. Whether you're scaling a recipe from US cups to metric milliliters, calculating fuel tank capacity in gallons versus liters, or converting lab measurements between mL and cm³, our Volume Converter handles all common liquid and dry volume units in a single tool.
Select your source and target units from 12 supported units spanning metric and US customary systems, enter your value, and the result appears instantly. A swap button reverses the conversion direction with one click. Pre-loaded quick examples — Water Bottle (2L), Milk Jug (1 gal), and Recipe (250 mL) — let you explore common conversions immediately.
The Conversion Details panel shows the result alongside a reference list of common conversion factors and everyday volume benchmarks so you can sanity-check results at a glance.
All units are converted via litres as the common base. Multiply the input by the source unit's litre factor to reach litres, then divide by the target unit's litre factor to get the final result.
Metric vs US Customary Volume Units
Metric units: Milliliters (mL), Liters (L), Cubic Centimeters (cm³), Cubic Meters (m³). The metric system is decimal-based — 1 L = 1,000 mL = 1,000 cm³.
US customary units: Teaspoon, Tablespoon, Fluid Ounce, Cup, Pint, Quart, Gallon. These are used primarily in the United States for cooking and everyday measurement.
Imperial units: The UK Imperial gallon (4.54609 L) differs from the US gallon (3.78541 L). Always confirm which gallon definition a recipe or specification uses.
Common Volume Benchmarks
Water bottle: Standard single-serve bottles are 500 mL or 1 L.
Soda can: 355 mL (12 fl oz) in the US; 330 mL in most other countries.
Cooking cup: 236.588 mL (8 fl oz) — used in US recipe measurements.
Milk jug: 1 US gallon = 3.785 L, the standard large format in US supermarkets.
Wine bottle: 750 mL = 0.75 L — the standard wine bottle size globally.
Fuel tank (car): Typically 45–70 liters (12–18 US gallons) for passenger vehicles.
Practical Examples
Converting a Recipe from Cups to Milliliters
US baking recipes use cups; metric recipes use mL. A common conversion for home cooks.
- 1.From: Cups → To: Milliliters
- 2.Input: 2.5 cups
- 3.Result: 591.47 mL
- 4.Use case: Scaling or converting US baking recipes for metric kitchen scales
Converting Fuel from Gallons to Liters
US vehicles use gallons; most other countries use liters. Essential for travel and imports.
- 1.From: Gallons (US) → To: Liters
- 2.Input: 15 gal
- 3.Result: 56.7812 L
- 4.Use case: Fuel cost comparison, vehicle spec sheets, imported car documentation
Frequently Asked Questions
How many milliliters are in a liter?
There are exactly 1,000 milliliters in one liter. This is one of the most fundamental metric volume conversions: 1 L = 1,000 mL.
How many liters are in a US gallon?
One US gallon equals approximately 3.78541 liters. Note that the Imperial gallon (used in the UK) is larger at 4.54609 liters.
How many mL is one cup?
One US cup equals 236.588 milliliters. This is the standard US customary cup used in cooking and baking recipes.
What is the difference between US and Imperial gallons?
The US gallon equals 3.78541 liters while the Imperial gallon (used in the UK, Canada, and some Commonwealth countries) equals 4.54609 liters. The Imperial gallon is about 20% larger.
How many fluid ounces in a cup?
One US cup equals 8 US fluid ounces, which is 236.588 mL. A fluid ounce measures volume (29.5735 mL), not weight.
How many tablespoons in a cup?
There are 16 tablespoons in one US cup. Each tablespoon is approximately 14.7868 mL.
What is a cubic centimeter in volume terms?
One cubic centimeter (cm³) is exactly equal to one milliliter (mL). This equivalence makes it easy to convert between the two units — they are interchangeable.
How many cups in a liter?
One liter equals approximately 4.22675 US cups. So if a recipe calls for 1 liter of liquid, you would need just over 4 cups.