📏 Length⚖️ Weight🌡️ Temperature💧 Volume📐 Area🚀 Speed⏱️ Time💾 Data⚡ Energy🔧 Pressure∠ Angle

Free, Fast & Precise Unit Conversion

200+ units · 11 categories · 40+ languages · No login required

✓ Free forever ✓ No login ✓ Instant results ✓ 40+ languages
200+
Units
11
Categories
40+
Languages
Free uses

All Categories

📏
Length
mm, cm, m, km, in ...
⚖️
Weight
mg, g, kg, t, oz ...
🌡️
Temperature
°C, °F, K, °R ...
💧
Volume
ml, cl, L, m³, tsp ...
📐
Area
mm², cm², m², km², in² ...
🚀
Speed
m/s, km/h, mph, kn, ft/s ...
⏱️
Time
ns, μs, ms, s, min ...
💾
Data
bit, B, KB, MB, GB ...
Energy
J, kJ, MJ, cal, kcal ...
🔧
Pressure
Pa, kPa, MPa, bar, mbar ...
Angle
°, rad, grad, ', " ...

Popular Conversions

cm → inm → ftkg → lblb → kg°C → °F°F → °CL → galml → fl ozm² → ft²ft² → m²km/h → mphmph → km/h

The World's Most Complete Free Unit Converter

FreeUnitConverters.com gives you instant, accurate unit conversion across 11 categories and 200+ units — completely free, with no login or signup required. Whether you need to convert centimeters to inches, kilograms to pounds, Celsius to Fahrenheit, or megabytes to gigabytes, our converter delivers precise results the moment you type.

Available in 40+ languages, our tool is built for everyone — from students and engineers to travelers and home cooks. Every conversion uses scientifically verified factors, and the interface is optimized for both desktop and mobile devices.

Why FreeUnitConverters.com?

How accurate are the conversions?
All conversion factors are sourced from international standards including the International System of Units (SI) and NIST. Results are precise to 10 significant figures.
Do I need to create an account?
No. FreeUnitConverters.com is completely free with no login, no registration, and no limits on usage.
Does it work on mobile?
Yes. The interface is fully responsive and optimized for touchscreens with large input fields and clear results.
How many units are supported?
Over 200 units across 11 categories: Length, Weight, Temperature, Volume, Area, Speed, Time, Data Storage, Energy, Pressure, and Angle.