Multiple Unit Categories
Convert measurements across commonly used unit categories.
Unit Converter
Convert length, weight, temperature, volume, area, speed, time, data, pressure, energy, and more instantly with accurate results.
What do you want to convert?
Choose a category and enter your value.
1
I have
Enter your value
2
I want
See the converted value
0
Conversion
Enter a value to convert instantly.
Precision
Quick Conversions
Popular conversions ready to use.
FREE ONLINE UNIT CONVERTER — NO SIGN UP REQUIRED
Unit Converter
Convert Units Quickly and Easily
Convert measurements between different units quickly and accurately. Convert length, weight, temperature, area, volume, speed, time, and other common measurement units from one format to another.
Useful for students, professionals, engineers, developers, travelers, researchers, shoppers, and anyone who works with different measurement systems.
Free to Use
Multiple Units
Instant Results
Browser Based
Quick Tool Overview
The All Free Tool's Unit Converter helps you convert a measurement from one unit to another without manually calculating conversion factors.
Enter a value, select the original unit, choose the unit you want to convert to, and get the converted result instantly.
It can make everyday calculations easier when working with different measurement systems, such as metric and imperial units.
About the Unit Converter
What Is a Unit Converter?
A unit converter is a tool that changes a measurement from one unit of measurement to another while preserving the same underlying quantity.
Common Unit Categories
Unit conversion can be used for many categories, including length, weight or mass, temperature, area, volume, speed, time, and other commonly measured quantities.
Metric and Imperial Units
Different countries and industries use different measurement systems. A unit converter makes it easier to move between metric units such as meters and kilograms and imperial or US customary units such as feet, miles, and pounds.
How the Unit Converter Works
Enter a numerical value, select its current unit, select the target unit, and start the conversion. The calculator applies the appropriate conversion relationship and displays the equivalent value.
Length Conversion
Length conversions can be useful when converting measurements such as millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Weight and Mass Conversion
Weight or mass conversions can help when working with units such as grams, kilograms, ounces, pounds, and other supported measurements.
Temperature Conversion
Temperature conversion commonly involves Celsius, Fahrenheit, and Kelvin. Unlike simple scaling conversions, temperature conversions can involve both multiplication and an offset.
Check the Unit Before Converting
Always verify the original and target units before using a conversion result. Choosing the wrong unit can produce a numerically correct conversion for an entirely different measurement.
Key Features
Length Conversion
Convert supported length measurements between metric and imperial units.
Weight Conversion
Convert supported weight or mass measurements between different units.
Temperature Conversion
Convert temperatures between supported temperature scales.
Volume Conversion
Convert supported liquid and volume measurements between units.
Area Conversion
Convert supported area measurements for practical calculations and comparisons.
Speed Conversion
Convert supported speed units for travel, engineering, and everyday calculations.
Time Conversion
Convert supported time measurements into equivalent units.
Instant Results
Get converted values quickly without manually applying conversion formulas.
Browser Based
Convert units directly from your browser without installing additional software.
How to Use the Unit Converter
Follow these simple steps to convert a measurement from one unit to another.
Choose a Unit Category
Select the type of measurement you want to convert, such as length, weight, temperature, area, volume, speed, or time.
Pro Tip: Choosing the correct category first helps prevent unit selection mistakes.
Enter the Value
Enter the numerical measurement you want to convert.
Pro Tip: Check the number carefully before converting decimal or very large values.
Select the Original Unit
Choose the unit currently associated with the value you entered.
Pro Tip: Make sure you select the exact unit rather than a similar-looking measurement.
Select the Target Unit
Choose the unit you want the measurement converted into.
Pro Tip: Use a unit that is practical for the final calculation or application.
Convert the Measurement
Start the conversion to calculate the equivalent value in your selected target unit.
Pro Tip: Make sure both selected units measure the same physical quantity.
Review the Result
Check the converted value and confirm that the displayed target unit is correct.
Pro Tip: For important measurements, verify the result and unit before using it elsewhere.
Copy the Converted Value
Copy the result for use in your document, calculation, project, or other workflow.
Pro Tip: Include the unit when copying a measurement so its meaning remains clear.
Apply the Converted Measurement
Use the converted value in your calculations, planning, research, project, or everyday task.
Pro Tip: Avoid rounding too early when precision is important to the final calculation.