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Volume Converter

Convert volume between liters, mL, gallons, quarts, fl oz, and cups. Handy for cooking, science, and travel. Input never leaves your device — everything runs locally in your browser.

100% Local Browser Native

How to Use the Volume Converter

1. Fill the inputs

Enter the volume with from- and to-units.

2. Read the converted value

Check the converted value with formula.

3. Compare scenarios

Change one input and re-read — the delta between runs is the decision signal.

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Frequently Asked Questions

How many milliliters are in a cup?

1 US cup = 236.588 mL. The converter uses US customary units by default.

How many liters are in a gallon?

1 US gallon = 3.78541 liters. Note: a UK (imperial) gallon is larger at 4.54609 liters.

What can I use this converter for?

Common uses include converting recipe measurements (cups to mL), fuel tank volumes (gallons to liters), and science lab measurements.

How big is a fluid ounce?

1 US fluid ounce = 29.5735 mL, roughly the volume of a tablespoon plus a teaspoon. It is a measure of volume, not weight.

When using Volume Converter, does this converter work offline?

Yes. All conversions run in your browser with no server calls.

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Last updated October 2026