Convert between commonly used units of length, weight, area, volume, temperature, time, speed, pressure, energy, power, angle and digital storage instantly.
Quick Conversions
0.001
Conversion Result
1 m=0.001 km
Universal Unit Converter
Our Unit Converter is a free online tool designed to convert measurements between commonly used units. Select a conversion category, enter your value, choose the source unit and select the unit you want to convert to — or tap one of the Quick Conversion buttons above to jump straight to a common pair.
The calculator supports metric, imperial and US customary units across twelve categories, making it useful for students, engineers, professionals and everyday calculations.
Supported Unit Conversions
You can convert units across the following measurement categories:
Length – meters, kilometers, centimeters, miles, feet, inches and nautical miles
Weight and Mass – kilograms, grams, pounds, ounces, stone and tons
Area – square meters, square feet, acres and hectares
Volume – liters, milliliters, gallons, quarts, cups, tablespoons and teaspoons
Temperature – Celsius, Fahrenheit, Kelvin and Rankine
Time – milliseconds, seconds, minutes, hours, days, weeks and years
Speed – meters per second, km/h, mph, knots and Mach
Data Storage – bits, bytes, kilobytes, up to petabytes
Pressure – pascal, bar, PSI, atmosphere and mmHg
Energy – joules, calories, kilowatt-hours and BTU
Power – watts, kilowatts, horsepower and BTU/hour
Angle – degrees, radians and gradians
How to Use the Unit Converter
First, select the type of measurement you want to convert. Enter the numerical value and select the unit you are converting from. Then choose the destination unit.
The conversion result is calculated automatically. You can also use the Swap button to quickly reverse the conversion direction, or a Quick Conversion button above the calculator for a one-tap shortcut to a common pair.
Metric and Imperial Unit Conversion
Different countries and industries use different measurement systems. Metric units such as meters and kilograms are widely used internationally, while feet, inches, miles and pounds remain common in the United States and other applications.
This converter makes it easy to switch between commonly used measurement systems without performing manual calculations.
Frequently Asked Questions
What can I convert with this tool?
You can convert length, weight, area, volume, temperature, time, speed, pressure, energy, power, angle and data storage units.
Can I convert Celsius to Fahrenheit?
Yes. Select Temperature, choose Celsius as the source unit and Fahrenheit as the destination unit, or use the Celsius → Fahrenheit Quick Conversion button above the calculator.
Can I convert kilograms to pounds?
Yes. Select Weight / Mass and choose kilograms and pounds, or use the kg → lb Quick Conversion button above the calculator.
Can I swap the conversion direction?
Yes. Use the Swap button to exchange the From and To units instantly.