Volume Converter

How to convert volume units

Type a volume, choose the unit you have and the unit you want, and read the result along with a full table of milliliters, liters, cubic meters and the US kitchen units.

The liter is the internal base and all ten units carry exact factors, so a chain like teaspoons to milliliters to cups stays consistent instead of accumulating rounding at each step.

• Enter the volume in the Value box, for example 2.
• Pick the From unit, for example Cup (US).
• Pick the To unit, for example Milliliter.
• Read the result, and confirm you are working in US units and not imperial ones.
• Copy the result, or use Swap units to convert back the other way.

US, imperial, and metric cups are three different sizes

Every customary unit on this page is the US version, and that matters more for volume than for any other measure. A US gallon is 3.785411784 L while an imperial gallon is 4.54609 L, about twenty percent larger. A US fluid ounce is 29.5735295625 ml while an imperial fluid ounce is 28.4130625 ml, and this time the US one is bigger. The two systems disagree in opposite directions, so there is no single correction factor to remember.

Cups are worse still, because three definitions are in daily use. The US customary cup this converter uses is 236.5882365 ml. The US legal cup on nutrition labels is exactly 240 ml. The metric cup used in Australia and New Zealand is 250 ml. A recipe that says "one cup" without saying which can be off by more than five percent, which shows up in baking long before it shows up in soup.

• US gallon 3.785411784 L, imperial gallon 4.54609 L (not in this list).
• US customary cup 236.5882365 ml, US legal cup 240 ml, metric cup 250 ml.
• US fluid ounce 29.5735295625 ml, imperial fluid ounce 28.4130625 ml.

Why volume will not convert to weight

The single most common request a volume converter cannot satisfy is grams to cups. Grams measure mass, cups measure volume, and the bridge between them is density, which is a property of the substance rather than of the units. A cup of water is about 236.6 g, a cup of all-purpose flour about 120 g, and a cup of honey about 340 g. Same volume, three different masses.

That is why this page has no ingredient list and refuses to guess. Convert the volume here, look up the density of your specific ingredient, multiply, and use the Weight Converter for the mass side. The one case where it feels like a free conversion is water at room temperature, where a milliliter is close enough to a gram for kitchen purposes, and that coincidence is exactly what makes people expect it to work for flour.