Unit Converter — Express Version
Pick a category, type a number, see the result instantly
Find the units to convert
Common conversions
- cm to inches
- kg to lbs
- Celsius to Fahrenheit
- mm to inches
- meters to feet
- km to miles
- gallons to liters
- ounces to grams
- mph to kph
- acres to square feet
- cups to mL
- hp to kW
- inches to cm
- lbs to kg
- Fahrenheit to Celsius
- inches to mm
- feet to meters
- miles to km
- feet to cm
- grams to ounces
- kph to mph
- square feet to acres
- mL to cups
- kW to hp
Unit Converters — Full Versions
Common Converters
- Length Converter
- Weight and Mass Converter
- Volume Converter
- Temperature Converter
- Area Converter
- Pressure Converter
- Energy Converter
- Power Converter
- Force Converter
- Time Converter
- Speed Converter
- Angle Converter
- Fuel Consumption Converter
- Numbers Converter
- Data Storage Converter
- Volume - Dry Converter
- Currency Converter
- Case Converter
Heat Converters
- Fuel Efficiency - Mass Converter
- Fuel Efficiency - Volume Converter
- Temperature Interval Converter
- Thermal Expansion Converter
- Thermal Resistance Converter
- Thermal Conductivity Converter
- Specific Heat Capacity Converter
- Heat Density Converter
- Heat Flux Density Converter
- Heat Transfer Coefficient Converter
Electricity Converters
- Charge Converter
- Linear Charge Density Converter
- Surface Charge Density Converter
- Volume Charge Density Converter
- Current Converter
- Linear Current Density Converter
- Surface Current Density Converter
- Electric Field Strength Converter
- Electric Potential Converter
- Electric Resistance Converter
- Electric Resistivity Converter
- Electric Conductance Converter
- Electric Conductivity Converter
- Electrostatic Capacitance Converter
- Inductance Converter
A unit is a fixed, agreed-upon measure of a given quantity. Other quantities can be expressed as a multiple of the unit.
In human history, various unit systems were developed and used in different regions and cultures. Currently, the global standard of measurement is the International System of Units (SI), a modern form of the metric system. Although SI is intended for global use, it has not been fully adopted, and some other systems of measurement are still used in parts of the world.
The intent of this site is to provide a convenient way to convert between the various units of measurement within different systems, and a basic understanding of the systems currently in use and how they interact. See Common Unit Systems for more.