Volume Converter

Convert between gallons, liters, cups, milliliters, fluid ounces, and more instantly.

By Drew Budwin · Last updated July 2026 · Methodology

Embed this calculator

Add it to your website or blog

Embed this calculator

Theme

Paste this code into your website's HTML where you want the calculator to appear. It adds a small credit link back to CalcTray. Please keep it. How embedding works.

Optional: auto-resize iframe to fit content

Add this snippet to your page so the iframe height adjusts automatically after each calculation:

Volume Converter Formula

Volume conversion formula:

result = value × (fromFactor ÷ toFactor)

fromFactor = source unit's milliliter factor, toFactor = target unit's milliliter factor

How to Use This Calculator

  1. Enter the value you want to convert.
  2. Type in the From field to search for your source unit and select it from the dropdown.
  3. Type in the To field to search for your target unit and select it.
  4. Click Convert (or press Enter) to see the result.
  5. Use the swap button between the dropdowns to quickly reverse the conversion direction.

Frequently Asked Questions

How many liters are in a gallon?

One US gallon equals approximately 3.78541 liters. To convert gallons to liters, multiply the number of gallons by 3.78541.

How do I convert cups to milliliters for cooking?

One US cup equals approximately 236.588 milliliters. To convert cups to milliliters, multiply the number of cups by 236.588. For example, 2 cups is about 473 mL.

What is the difference between fluid ounces and ounces?

Fluid ounces measure volume (liquid capacity), while ounces measure weight. One US fluid ounce equals approximately 29.5735 milliliters. They are not interchangeable. A fluid ounce of water weighs roughly one ounce, but other liquids differ. To convert weight units, use the weight converter.

What is the difference between a US cup and a metric cup?

A US cup is 236.588 mL while a metric cup (used in Australia and some other countries) is exactly 250 mL. Always check which cup standard your recipe uses to avoid measurement errors.

How many tablespoons are in a cup?

One US cup equals 16 US tablespoons. One tablespoon equals 3 teaspoons, so there are 48 teaspoons in a cup.

How do I convert milliliters to fluid ounces for medicine or cooking?

Divide milliliters by 29.5735 to get US fluid ounces. A 15 mL tablespoon is about 0.507 fl oz. In the UK, one fluid ounce is 28.4131 mL — slightly larger. This converter uses US fluid ounces.

What is the difference between a US gallon and an imperial gallon?

The US gallon is 3.78541 liters; the UK imperial gallon is 4.54609 liters — about 20% larger. This matters for fuel economy comparisons: "miles per gallon" means different things in US and UK spec sheets. This converter uses US gallons.

How do I find the volume of an irregularly shaped container?

Fill the container with water, pour it into a measuring vessel, and read the volume. Alternatively, measure the average length, width, and depth and treat it as a cuboid using the cuboid volume calculator, then convert here.

Can I share my conversion?

Yes. After clicking Convert, the URL updates with your input values. Copy and share the URL to let anyone else see the same pre-filled converter and result.

Further Reading

Related Calculators

Area Converter

Convert between square feet, square meters, acres, hectares, and more instantly.

Length Converter

Convert between miles, kilometers, feet, meters, inches, yards, and more instantly.

Weight Converter

Convert between pounds, kilograms, ounces, grams, stone, metric tons, and more instantly.