Volume Converter
Convert volume between liters, gallons, cups, milliliters and more.
Results update as you type.
About this calculator
A volume converter changes a capacity between metric units (milliliter, liter, cubic meter), US customary cooking and liquid measures (teaspoon, tablespoon, fluid ounce, cup, pint, quart, gallon), the UK gallon, and cubic inches and feet. Everything converts through the liter as a common base.
The relationship that trips people up is the two gallons: the US gallon is 3.785411784 liters while the UK (imperial) gallon is 4.54609 liters, about 20% larger. The US cup, tablespoon and teaspoon used here are 236.6 ml, 14.79 ml and 4.93 ml respectively.
Worked example: to convert 2 US gallons to liters, multiply by 3.78541, giving about 7.57 liters. To find how many US cups are in a liter, divide 1,000 ml by 236.6, giving about 4.23 cups. A results table lists the same capacity in every unit at once, so you can move between a European recipe in milliliters and a US one in cups without a second step.
Frequently asked questions
How many liters are in a US gallon?
One US gallon is about 3.78541 liters. The UK (imperial) gallon is larger at 4.54609 liters, so be sure to pick the right one.
How many milliliters in a cup?
A US cup is about 236.6 milliliters. A US tablespoon is about 14.79 ml and a teaspoon about 4.93 ml.
Why do US and UK gallons differ?
They are simply different historical definitions. A UK gallon is about 20% larger than a US gallon, which is why fuel economy in mpg looks better in the UK.
How many teaspoons are in a tablespoon?
One US tablespoon holds 3 teaspoons, and 16 tablespoons make a US cup. So a quarter-cup is 4 tablespoons or 12 teaspoons.
How many fluid ounces are in a US gallon?
A US gallon is 128 fluid ounces, made up of 4 quarts, 8 pints or 16 cups. One US fluid ounce is about 29.57 ml.
How does this volume converter handle US versus UK gallons?
The volume converter keeps them separate: the US gallon is 3.78541 liters and the UK gallon is 4.54609 liters. Pick the one your recipe or fuel figure actually uses, since mixing them introduces a 20% error.
API — use this calculator from code
Call this calculator as a free JSON endpoint — no key required. Send the field values below as query parameters or JSON. Read the full API docs →
Endpoint
GET https://calculator.free/api/v1/volume/curl
curl "https://calculator.free/api/v1/volume/?amount=1&from=l&to=gal"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/volume/?" + new URLSearchParams({
"amount": "1",
"from": "l",
"to": "gal"
}));
const data = await r.json();
console.log(data.results);Results are estimates for general guidance only, not financial, medical or tax advice.