Unit Converter — Convert Metric & Imperial Units Free
Instantly convert length, weight, temperature, volume, area, speed, time and data. 100% free, no signup, and it runs privately in your browser.
How the unit converter works
Pick a category
Choose length, weight, temperature, volume, area, speed, time or data.
Enter your value
Type a number and select the unit to convert from and the unit to convert to.
Get the result
The converted answer appears instantly — copy it with one click.
Why use this free online unit converter
This free unit converter turns one measurement into another in real time, right inside your browser. Whether you need a quick metric to imperial conversion or the other way around, you can convert units of length, weight, temperature, volume, area, speed, time and digital data without installing anything or creating an account.
Use it as a length converter to change kilometers to miles, centimeters to inches, or meters to feet. Switch to the weight converter to go from kilograms to pounds, grams to ounces, or stones to kilos. The temperature converter handles Celsius to Fahrenheit and Kelvin instantly, so common questions like converting body temperature or oven settings take a second. There are also dedicated modes for volume (liters to gallons), area (square meters to square feet, hectares to acres), speed (km/h to mph, knots), time, and data storage (megabytes to gigabytes).
Everything runs locally with JavaScript, which means your numbers are never uploaded to a server. That makes this a fast, private, and ad-light online unit conversion calculator you can rely on for homework, cooking, travel, engineering, fitness, and everyday DIY measurements. Popular conversions people reach for include km to miles, kg to lbs, cm to inches, mph to km/h, Celsius to Fahrenheit, liters to gallons, and square feet to square meters — all built in.
How we compare to other converters
Looking for a free alternative to UnitConverters.net, RapidTables, or ConvertUnits? FixItWhy gives you the same everyday conversions with a cleaner, distraction-light interface that runs entirely in your browser. FixItWhy is not affiliated with UnitConverters.net, RapidTables, or ConvertUnits.
| Feature | FixItWhy Unit Converter | Typical converter sites |
|---|---|---|
| Runs fully in your browser | Yes | Sometimes |
| Free with no signup | Yes | Usually |
| No watermark or export limits | Yes | Varies |
| 8 categories in one page | Yes | Varies |