Universal Unit Converter
Why a universal converter is essential
The multiplication of measurement systems (metric, imperial, US customary…) makes conversions tedious and error-prone.
In cooking, the wrong conversion can ruin a recipe.
In science or engineering, it can compromise the reliability of an experiment or project.
With our Universal Unit Converter, manual calculations are a thing of the past: save time and ensure the accuracy of your data, whatever the context.
How our converter works
Select category
Select the category of units to convert (length, temperature, volume, etc.).
Select units
Indicate the start and end units in the drop-down menus.
Enter value
Enter the number to be converted (e.g. 5, 32.7, 1,000).
Click on “Convert”.
Get the result immediately, with three decimal places by default.
Tip: Click on the “🔄” icon to invert units in a single gesture.
Available unit categories
Length (meter, inch, foot, kilometer…)
Mass (kilogram, pound, ounce, ton…)
Volume (liter, gallon, cup, m³…)
Temperature (°C, °F, K…)
Surface (m², ha, acre…)
Speed (km/h, m/s, knot…)
Pressure (Pa, bar, psi…)
Energy (Joule, calorie, kWh…)
Power (Watt, horsepower…)
Digital data (bit, byte, KB, MB…)
Time (second, minute, hour, day…)
…and many more!
Key features
Clear, responsive interface
Adapted to all screens, from mobile to desktop, with optimized dark background.Local conversion
No data is stored: conversion takes place in your browser.Instant performance
Results displayed in less than a second.Customize
Choose the number of decimal places or activate the “scientific” mode for very large numbers.Multilingual
Available in English, French, German, Spanish and Norwegian.
Best practices for reliable conversions
Always check the output device
Make sure it corresponds to the format expected in your documents or calculations.Round intelligently
Limit the number of decimal places according to the precision required.Use saved conversions
For recurring conversions, make a note of them in a note manager or integrate them into your spreadsheets.
PREGUNTAS FRECUENTES
Q: Is the tool really free and ad-free?
A: Yes, our Universal Unit Converter is completely free of charge, without advertising or registration.
Q: Is my data stored?
A: No, all conversions are performed locally in your browser, without saving.
Q : Can I adjust the number of decimal places?
A: Absolutely: click on “Settings” to choose between 0 and 6 decimal places.
Q: What languages are available?
A: French, English, German, Spanish and Norwegian.
Q: How do I report an error or suggest a new unit?
A: Use the “Contact us” form at the bottom of the page to submit your suggestions.