Free Online Unit Converter
Convert common measurements instantly. Choose a category, enter a value, and select the units. Results update in your browser without submitting a form.
Convert measurement units
This tool runs in your browser. Input content is not intentionally uploaded by this page.
How does the unit converter work?
The converter uses standard conversion factors for supported measurement categories. For most units, the value is converted to a common base unit and then into the selected target unit. Temperature conversions use separate formulas because Celsius, Fahrenheit and Kelvin have different zero points.
How to use this unit converter
- Select a measurement category such as length, weight or temperature.
- Enter the value you want to convert.
- Select the source unit and target unit.
- Read the result, which updates automatically as you change the inputs.
- Use Swap units to reverse the conversion or Copy result to copy the displayed value.
Available conversion categories
- Length: meters, kilometers, centimeters, miles, feet and more.
- Weight / mass: kilograms, grams, pounds, ounces and metric tonnes.
- Temperature: Celsius, Fahrenheit and Kelvin.
- Area: square meters, square kilometers, square feet, acres and hectares.
- Volume: liters, milliliters, cubic meters, US gallons and US cups.
- Time and speed: seconds, minutes, hours, days, meters per second, kilometers per hour and miles per hour.
- Digital storage: decimal bytes and kilobytes alongside binary kibibytes and mebibytes.
Frequently asked questions
Are unit conversion results exact?
Results depend on the definition of each unit and the precision used in the calculation. The tool displays rounded values for readability; use the underlying conversion definitions when higher precision is required.
What is the difference between KB and KiB?
In this tool, KB uses the decimal definition of 1,000 bytes, while KiB uses the binary definition of 1,024 bytes. The same distinction applies to MB versus MiB and GB versus GiB.
How are temperatures converted?
Celsius, Fahrenheit and Kelvin use formulas that account for both scale and offset. Kelvin values below absolute zero are not physically valid.
Can I convert units on a mobile phone?
Yes. The converter is responsive and can be used in a modern mobile or desktop browser.
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