Universal Unit Converter
Convert between units quickly and accurately across length, mass, temperature, time, volume, area, speed, data, energy, pressure, angle, and more — with live results, history, and copy/download options.
Advanced Settings
▼
-
Enter a value and select units to convert
Conversion History
User Guide
How to Use the Converter
Enter a value, choose the units to convert from and to, then press Convert (or use Enter). Use the swap button to flip units. Results update live and can be copied or downloaded.
Key Features
- Instant, accurate conversions across common and scientific unit categories
- Live preview of results as you type (toggleable)
- Swap units button to reverse "From" and "To"
- Precision control (number of decimal places) and automatic smart rounding
- Conversion history (last 10) with quick re-use and clear history button
- Copy result & copy as code (e.g., 5 km = 3.10686 mi) and download as CSV
- Bulk conversion mode (convert one input into multiple target units)
- Unit search & favorites (star to pin commonly used units)
Supported Unit Categories
Length / Distance
mm
cm
m
km
in
ft
yd
mi
Mass / Weight
mg
g
kg
t
oz
lb
Temperature
°C
°F
K
°R
Time
ms
s
min
h
day
week
Volume
mL
L
cL
fl oz
pt
qt
gal
Area
mm²
cm²
m²
ha
acre
Speed
m/s
km/h
mph
knot
Data / Storage
bit
B
KB
MB
GB
TB
Energy
J
kJ
cal
kcal
Wh
Pressure
Pa
kPa
bar
psi
Power
W
kW
hp
Angle
deg
rad
grad