Volume Converter
Convert litres, gallons, cups, millilitres and more.
✓ Professional standard Uses precise SI and internationally agreed conversion factors for accurate, standards-based results.
Volume Converter is a free online converter from Toolinza. Convert litres, gallons, cups, millilitres and more. It runs entirely in your browser — your data is never uploaded — needs no signup, and works on any device. Toolinza offers 293+ free tools used by people across the UK, USA, Canada, Australia, the EU, India, Pakistan, the Middle East and worldwide.
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About the Volume Converter
Volume conversions turn up in the kitchen, at the pump and in the lab — litres, gallons, cups and millilitres rarely match across countries. A US gallon is not a UK gallon, and a cup is not a fixed amount everywhere, which is exactly why a converter helps.
This Volume Converter switches between litres, gallons, cups, millilitres and more using precise factors, so your measures are always right.
How to use the Volume Converter
- Enter the volume value.
- Select the unit you are converting from.
- Select the unit you are converting to.
- Read the converted volume instantly.
Key features of the Volume Converter
- Converts litres, gallons, cups, millilitres and more
- Precise conversion factors
- Handles US and imperial gallons
- Great for cooking and fuel
- Private — calculated in your browser
How the Volume Converter works
Every conversion uses the exact, internationally agreed factors defined by the International System of Units (SI) and recognised standards bodies. Temperature conversions apply the correct formulas rather than simple multipliers, and results retain full precision so they are suitable for scientific, engineering and everyday use alike.
All conversions are calculated instantly in your browser.
Tips & best practices
- US and UK gallons differ, so make sure you pick the right one — the converter distinguishes them.
- One litre is about 0.26 US gallons, a useful anchor at the fuel pump.
- Cups vary by country, so convert to millilitres for precise cooking.
Standards & accuracy
Uses precise SI and internationally agreed conversion factors for accurate, standards-based results.
Results are accurate to standard conversion factors. For everyday use you can round sensibly; for scientific, medical or engineering work, keep the full precision the tool provides.
Who uses the Volume Converter?
- Converting recipe measures between countries
- Working out fuel in litres or gallons
- Science and lab measurements
- Everyday capacity conversions
Privacy & security
The Volume Converter runs entirely inside your web browser. Your data — whether that is a file, figures or text — is processed on your own device and is never uploaded to a server, stored or shared. There is no signup and no account, so you can use it as often as you like while keeping full control of your information. This makes it a safe choice even for confidential and sensitive work.
Why choose Toolinza?
- 100% free — no hidden charges, watermarks or usage caps.
- Private & secure — your data stays on your device.
- Standards-compliant — accurate results suitable for the UK, USA, Canada, Australia, EU, India, Pakistan, the Middle East and worldwide.
- Works everywhere — desktop, tablet and mobile.
Frequently asked questions
A US gallon is about 3.79 litres and a UK gallon is about 4.55 litres. The converter handles both, so choose the correct one.
A cup is defined slightly differently across countries, so for accuracy convert to millilitres, which the tool supports.
Yes. It distinguishes US and imperial gallons and other units for accurate conversions.
Yes. The Volume Converter is completely free with no signup, no watermarks and no usage limits. Toolinza is supported by unobtrusive advertising so every tool stays free.
Absolutely. This tool runs entirely in your browser — your data and files are never uploaded to any server, so everything stays private on your own device.
No. The Volume Converter works instantly in any modern web browser on desktop, tablet and mobile — Windows, macOS, Linux, Android and iOS.