All Free Conversion Categories
Browse our comprehensive collection of free unit converters. Select any category below to start converting instantly.
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Popular Free Categories
Most Used
📏length
22 units
Convert between different units of distance like meters, feet, and miles.
Example Units:
Nanometers (nm)
Micrometers (μm)
Millimeters (mm)
+19 more
⚖️weight
19 units
Convert between different units of mass like kilograms, pounds, and ounces.
Example Units:
Micrograms (μg)
Milligrams (mg)
Grams (g)
+16 more
🌡️temperature
5 units
Convert between Celsius, Fahrenheit, and Kelvin temperature scales.
Example Units:
Celsius (°C)
Fahrenheit (°F)
Kelvin (K)
+2 more
🧪volume
25 units
Convert between different units of volume like liters, gallons, and cubic meters.
Example Units:
Cubic Millimeters (mm³)
Cubic Centimeters (cm³)
Milliliters (ml)
+22 more
📐area
17 units
Convert between different units of area like square meters, acres, and square feet.
Example Units:
Square Millimeters (mm²)
Square Centimeters (cm²)
Square Inches (in²)
+14 more
⏱️time
14 units
Convert between different units of time like seconds, minutes, hours, and days.
Example Units:
Nanoseconds (ns)
Microseconds (μs)
Milliseconds (ms)
+11 more
Scientific & Engineering (Free)
Technical
⚡energy
11 units
Convert between different units of energy like joules, calories, and kilowatt-hours.
Example Units:
Joules (J)
Kilojoules (kJ)
Calories (cal)
+8 more
🔋power
12 units
Convert between different units of power like watts, horsepower, and BTUs per hour.
Example Units:
Watts (W)
Kilowatts (kW)
Megawatts (MW)
+9 more
🔬pressure
11 units
Convert between different units of pressure like pascal, bar, and PSI.
Example Units:
Pascal (Pa)
Kilopascal (kPa)
Megapascal (MPa)
+8 more
🚀speed
8 units
Convert between different units of speed like mph, km/h, and meters per second.
Example Units:
Centimeters per Second (cm/s)
Meters per Second (m/s)
Kilometers per Hour (km/h)
+5 more
🧭angle
8 units
Convert between different units of angle measurement like degrees and radians.
Example Units:
Degrees (°)
Radians (rad)
Gradians (grad)
+5 more
Digital & Miscellaneous (Free)
Specialized
💾data
14 units
Convert between different units of digital data like bytes, kilobytes, and gigabytes.
Example Units:
Bits (b)
Bytes (B)
Kilobits (Kb)
+11 more
⛽fuel
7 units
Convert between different units of fuel efficiency like mpg and liters per 100km.
Example Units:
Miles per Gallon (US) (mpg)
Miles per Gallon (UK) (mpg (UK))
Kilometers per Liter (km/L)
+4 more