Volume Converter
Free online Volume Converter to convert between liters, gallons, milliliters, cups, and fluid ounces.
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The Volume Converter instantly converts between liters, gallons, milliliters, cups, fluid ounces, and more. From scaling a recipe to comparing fuel prices to a science calculation, it gives you the exact volume in one click — and keeps the tricky US-versus-UK units straight.
One Tool for Cooking, Fuel, and Science
Volume units are scattered across systems and countries. Metric uses liters and milliliters, US recipes use cups and fluid ounces, and gallons differ between the US and UK. Convert by hand and it's easy to grab the wrong factor — especially with gallons and fluid ounces. This converter handles them all and tells the regional variants apart.
How to Convert
- Enter the volume value.
- Choose the from and to units.
- Read the converted result instantly.
Common Volume Conversions
| From | To | Equivalent |
|---|---|---|
| 1 liter | milliliters | 1,000 mL |
| 1 US gallon | liters | ≈ 3.785 L |
| 1 UK gallon | liters | ≈ 4.546 L |
| 1 US cup | milliliters | ≈ 237 mL |
The US vs. UK Gallon Trap
This is the single biggest source of volume errors. A US gallon is about 3.785 L; a UK gallon is about 4.546 L — nearly 20% larger. Mix them up and a fuel-economy comparison or a scaled recipe goes badly wrong. Whenever you see "gallon," confirm which country's gallon is meant before you convert.
Why Bakers Convert to Milliliters
Cup sizes vary between countries, and a "cup" of one ingredient weighs differently from a "cup" of another. For reliable baking, the safest move is to convert volume measurements to milliliters (or, for dry ingredients, to grams by weight). It removes the ambiguity that causes recipes to fail when crossing borders.
Who Uses a Volume Converter
- Cooks and bakers following international recipes.
- Drivers comparing fuel in gallons and liters.
- Students and scientists in lab measurements.
- Anyone reading a volume in an unfamiliar unit.
Accurate and Free
The converter uses exact factors at full precision and distinguishes US from UK units, all in your browser. Convert as often as you need, free.
Frequently Asked Questions
How many milliliters are in a liter?
There are 1,000 milliliters in a liter. So 0.5 L is 500 mL. This clean metric relationship makes liter-to-milliliter conversions easy and is common in cooking and science.
Are US and UK gallons the same?
No, and this trips many people up. A US gallon is about 3.785 liters, while a UK (imperial) gallon is about 4.546 liters — noticeably larger. Always check which gallon a recipe or fuel figure refers to before converting.
How many cups are in a liter?
About 4.23 US cups make a liter, since a US cup is roughly 237 mL. Cup sizes also vary by country, so for precise baking it's safer to convert to milliliters or grams.
Why do US and UK fluid ounces differ?
A US fluid ounce is about 29.57 mL, while a UK fluid ounce is about 28.41 mL. The small difference adds up in larger quantities, so match the system your recipe uses.
Why is volume conversion important in cooking?
Recipes from different countries use liters, milliliters, cups, and ounces interchangeably. Converting accurately keeps ingredient ratios correct, which matters especially in baking where precision affects the result.
What units does this support?
It handles milliliters, liters, US and UK gallons, US cups, fluid ounces, pints, and quarts, covering cooking, fuel, and science in one tool.
Is the conversion accurate?
Yes. It applies exact factors at full precision and distinguishes US from UK units to avoid the most common volume-conversion errors.
Is this tool free?
Yes — free, instant, and unlimited, with no signup.