Free Volume Converter – Convert Liters, Gallons & More
Convert between litres, gallons, cups, cubic units and more.
About the Volume Converter
What is the Volume Converter?
A volume converter translates between litres, millilitres, cubic units and both US and imperial cooking or fuel measures.
Why use this calculator?
Recipes, fuel economy and shipping all use volume heavily, and US and imperial gallons differ, so an exact converter matters.
How to use it
- Enter the volume value.
- Choose the source and target units.
- Read the converted volume.
Formula
Every unit is defined relative to the liter.
A US gallon is about 3.785 L, while an imperial gallon is about 4.546 L.
Frequently Asked Questions
Why are there two different gallons?
The US gallon and the imperial (UK) gallon were standardised differently. The US gallon is smaller at about 3.785 litres versus 4.546 litres.
How many millilitres are in a cup?
A US customary cup is about 236.6 millilitres.
How precise are the conversions?
Conversions use standard, internationally defined factors and are rounded for display. They are accurate to the number of digits shown.
Can I convert back and forth without losing accuracy?
Yes. Enter the original value to get an exact inverse conversion; avoid chaining rounded results if you need maximum precision.
Which measurement system is used?
Both metric (SI) and US customary / imperial units are supported and clearly labelled.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.