Convert any unit, instantly. Free & forever.
convertunits4u.com is a free online unit converter built for speed and simplicity. Whether you need to convert inches to centimeters, pounds to kilograms, Fahrenheit to Celsius, or Mbps to MB/s, results appear the moment you type — no page reloads, no sign-up, and no ads.
Real-time conversion as you type
Based on international standards (SI, NIST)
Desktop, tablet, or phone
No data collection, no sign-up
Select a category, choose your "from" and "to" units, enter a value, and the result appears instantly. No sign-up needed.
Yes. All conversion factors are based on internationally recognized standards (SI units, NIST). Results are displayed to up to 6 significant figures.
Yes. convertunits4u.com is 100% free with no ads, no sign-up, and no data collection.
Length, Weight, Temperature, Speed, Volume, Area, Pressure, Energy, Power, Time, Digital Storage, Data Transfer, and Fuel Consumption — over 100 units total.