Volume Converter
Convert liters, milliliters, cubic meters, US gallons, quarts, cups and fluid ounces — with US customary and UK imperial units kept apart.
- InstantResults update as you type
- 27 categoriesFrom length to data storage
- PrivateRuns in your browser
How to use this tool
Steps for using the Unit Converter.
- Type a number into From — liters are preselected. Commas and scientific notation such as 2.5e3 are accepted.
- Pick the units to convert between; the result in US gallons (or whichever unit you choose) updates as you type. Use the swap button to reverse the conversion.
- Set the decimal places, turn on Show formula to see the calculation, and copy or share the result.
- Below the converter, the table lists every volume unit with its exact definition, and the links open dedicated pages for the most common pairs.
Example
10 liters to US gallons
10 L2.641721 gal (US)
Formula: gal (US) = L ÷ 3.785411784Common use cases
- Recipes that use cups, fluid ounces or milliliters.
- Fuel and liquids sold in liters, US gallons or UK gallons.
- Tank, pool and container capacities in liters and cubic meters.
Volume unit table
| Unit | Symbol | System | Definition | In cubic meters |
|---|---|---|---|---|
| Milliliter | mL | Metric | 1/1000 L = 1 cm³ | 0.000001 |
| Liter | L | Metric | 1 dm³ = 1/1000 m³ | 0.001 |
| Cubic centimeter | cm³ | Metric | 1 mL | 0.000001 |
| Cubic meter | m³ | SI | SI unit of volume = 1,000 L | 1 |
| US gallon | gal (US) | US customary | 231 in³ = exactly 3.785411784 L | 0.0037854118 |
| US quart | qt (US) | US customary | 1/4 US gallon | 0.0009463529 |
| US cup | cup (US) | US customary | 1/16 US gallon = 236.5882365 mL | 0.0002365882 |
| US fluid ounce | fl oz (US) | US customary | 1/128 US gallon = 29.5735295625 mL | 0.0000295735 |
| Imperial gallon | gal (UK) | Imperial | Exactly 4.54609 L | 0.00454609 |
| Imperial fluid ounce | fl oz (UK) | Imperial | 1/160 imperial gallon = 28.4130625 mL | 0.0000284131 |
Popular volume conversions
- Liters to gallons converter1 L = 0.264172 gal (US)
- Gallons to liters converter1 gal (US) = 3.785412 L
- Milliliters to liters converter1 mL = 0.001 L
- Liters to milliliters converter1 L = 1,000 mL
- Cups to milliliters converter1 cup (US) = 236.588237 mL
- Cups to liters converter1 cup (US) = 0.236588 L
- Cubic meters to liters converter1 m³ = 1,000 L
Other unit converters
- Length convertermm · cm · m · km · in · ft · yd · mi · nmi
- Weight convertermg · g · kg · t · oz · lb · st
- Speed converterm/s · km/h · mph · ft/s · kn
- Temperature converter°C · °F · K
- Area convertermm² · cm² · m² · km² · in² · ft² · yd² · ac · ha
- Time converterms · s · min · h · d · wk
- Angle converter° · rad · gon · ′ · ″ · tr
- Pressure converterPa · kPa · MPa · bar · mbar · psi · atm · Torr · mmHg
About volume units
The SI unit of volume is the cubic meter; the liter is exactly one cubic decimeter (1/1,000 m³) and a milliliter is exactly one cubic centimeter.
US customary and UK imperial units have the same names but different sizes. The US gallon is 231 cubic inches (3.785411784 L); the imperial gallon is exactly 4.54609 L, about 20% larger. Fluid ounces differ too: a US fl oz is 29.5735 mL, an imperial fl oz 28.4131 mL — and there are 128 US fl oz in a US gallon but 160 imperial fl oz in an imperial gallon. This converter keeps them as separate units.
The US cup here is the customary cup, 1/16 US gallon (236.59 mL). Recipes from Australia, Canada and elsewhere often use a 250 mL metric cup, and US nutrition labels use a 240 mL “legal” cup.
Limitations
- Results are rounded for display only; the calculation keeps full precision (15 significant digits).
Frequently asked questions
How many liters are in a gallon?
A US gallon is 3.785 L; an imperial (UK) gallon is 4.546 L. Pick the right one in the converter — the difference is about 20%.
Is a mL the same as a cm³?
Yes, exactly. A milliliter is one cubic centimeter, and a liter is 1,000 cm³.
How many mL are in a cup?
A US customary cup is 236.59 mL. A metric cup is 250 mL, and the US legal cup on nutrition labels is 240 mL.
Are these volume conversions exact?
Each unit is defined from its official definition (for example 1 inch = 2.54 cm exactly). Results are calculated in double precision and only rounded to the decimal places you choose when shown.