Volume Converter

Convert between liters, gallons, cups, milliliters, cubic meters and more in an instant. Free, accurate and private — every calculation runs right in your browser.

How to use the volume converter

  1. Enter a value. Type the volume you want to convert into the Value box.
  2. Pick your units. Choose the unit to convert from and the unit to convert to, or press ⇄ to swap them.
  3. Read the result. The converted volume appears instantly, and the table below lists the same amount in every supported volume unit.

About this tool

This free volume converter switches between metric units such as milliliters, liters and cubic meters and US customary units such as teaspoons, tablespoons, fluid ounces, cups, pints, quarts and gallons, plus cubic inches, cubic feet and the larger UK gallon. It is ideal for cooking and baking, home brewing, fuel and fluid capacities, aquariums, and science homework where recipes and measurements jump between systems.

It is worth knowing that US and UK (imperial) liquid measures are not the same size — a US gallon is 3.785411784 liters while a UK gallon is 4.54609 liters — so this converter labels them separately to avoid mistakes, and its cup, pint and quart units follow US definitions. Every calculation is performed locally in your browser using exact factors, so nothing you enter is uploaded and your data stays private.

Frequently asked questions

How many milliliters are in a US cup?

One US cup equals about 236.59 milliliters. This tool uses the exact factor, so you can convert cups to milliliters and back precisely for any recipe.

What is the difference between a US gallon and a UK gallon?

A US gallon is 3.785411784 liters, while a UK (imperial) gallon is larger at 4.54609 liters — about 20% bigger. The converter lists both so you always pick the right one.

How many liters are in a gallon?

A US gallon holds about 3.785 liters and a UK gallon holds about 4.546 liters. Select the specific gallon unit you need and the exact liter value is shown instantly.

Is my data sent anywhere?

No. All conversions run locally in your browser with JavaScript. Nothing you type is transmitted or stored, so your data remains private.