Unit Conversion Categories
Our unit converter covers 15 categories with 200+ individual units — everything from everyday conversions (inches to centimeters, kilograms to pounds) to scientific and engineering measurements (hectopascals to atmospheres, ergs to joules).
- 📏 Length (mm, cm, m, km, inch, foot, yard, mile, nautical mile)
- ⚖️ Weight / Mass (mg, g, kg, ton, ounce, pound, stone)
- 🌡️ Temperature (Celsius, Fahrenheit, Kelvin, Rankine)
- 🧊 Volume (ml, L, fl oz, cup, pint, quart, gallon)
- 📐 Area (cm², m², km², inch², foot², acre, hectare)
- ⚡ Speed (m/s, km/h, mph, knots, Mach)
- ⏱️ Time (ms, seconds, minutes, hours, days, weeks, months, years)
- 💾 Data (bits, bytes, KB, MB, GB, TB, PB)
- And 7 more categories...
Metric vs Imperial — Quick Reference
| Measurement | Metric | Imperial / US |
|---|---|---|
| Length | kilometer, meter, centimeter | mile, yard, foot, inch |
| Weight | kilogram, gram | pound, ounce, stone |
| Volume | liter, milliliter | gallon, quart, pint, fl oz |
| Temperature | Celsius | Fahrenheit |
How to Convert Units
Select Category
Click the category tab (Length, Weight, Temperature, etc.) or type to search for a specific unit name.
Enter Your Value
Type your number in the "From" field and select the unit. The converted value appears instantly in all equivalent units simultaneously.
Find Your Target Unit
All conversions for the category display at once — scroll to find your target unit or use the search to jump directly to it.
All-At-Once Display: Instead of selecting a single target unit, our converter shows conversions to all units in the category simultaneously. Enter 5 kg and instantly see the equivalent in pounds, ounces, grams, tons, and every other weight unit — no need to convert repeatedly.
Temperature Conversion — Special Cases
Temperature conversion is non-linear (unlike most unit conversions which are simple multiplication), so the formulas are worth knowing:
- Celsius to Fahrenheit: (°C × 9/5) + 32
- Fahrenheit to Celsius: (°F − 32) × 5/9
- Celsius to Kelvin: °C + 273.15
- Key references: 0°C = 32°F (freezing), 100°C = 212°F (boiling), 37°C = 98.6°F (body temperature)
Data Size Conversion — Bits, Bytes & Beyond
Data size conversion is unique because it uses two different base systems: base-10 (SI units: 1 KB = 1,000 bytes) and base-2 (binary: 1 KiB = 1,024 bytes). Hard drive manufacturers use base-10 (why your 1TB drive shows as 931GB in Windows). Operating systems use base-2. Our tool handles both conventions clearly labeled.
Convert Any Unit Free
15 categories, 200+ units, all conversions shown simultaneously. No signup needed.
Open Unit ConverterMost Common Unit Conversions
- 1 inch = 2.54 cm | 1 foot = 30.48 cm | 1 mile = 1.609 km
- 1 kg = 2.205 pounds | 1 pound = 453.6 grams
- 1 liter = 0.264 US gallons | 1 US gallon = 3.785 liters
- 1 GB = 1,000 MB (SI) or 1 GiB = 1,024 MiB (binary)
ToolMatrix Unit Converter
15 unit categories, 200+ individual units, simultaneous conversion to all units in a category, SI and binary data size modes, and a searchable unit finder. Free, browser-based, instant, no account needed, works offline after first load.