Temperature Converter Online - Free Celsius Fahrenheit Kelvin Converter

Temperature Converter Tool

Convert temperature between Celsius, Fahrenheit, Kelvin, Rankine and Réaumur. The tool shows result, formula and a complete temperature conversion table.

🔒 Converted in your browser

Temperature Inputs

Value Enter the temperature value.

From Unit Original temperature unit.

To Unit Target temperature unit.

Decimal Places Choose result precision.

Status will appear here.

Converted Result 0

0 Input Value

- From Unit

- To Unit

0 Celsius Base

Formula

Choose units and enter value to see the formula.

Temperature Conversion Report No report generated yet

Unit	Symbol	Converted Value
No conversion table yet.

Conversion Notes

Enter a value and choose units, then click Convert.

Water freezes at 0°C and boils at 100°C at standard pressure.

Kelvin is commonly used in science and cannot go below absolute zero.

Fahrenheit is commonly used in some countries for weather and body temperature.

About This Tool

Temperature Converter is a free online unit converter that helps you convert temperature between Celsius, Fahrenheit, Kelvin, Rankine and Réaumur.

You can enter any temperature value, choose the original unit and target unit, and the tool will calculate the converted temperature instantly. It also shows the formula, Celsius base value and a full conversion table for all supported temperature units.

This tool is useful for students, science learning, cooking, weather conversion, engineering, education, travel and anyone who needs quick temperature conversions.

How to Use Temperature Converter

1. Enter the temperature value you want to convert.
2. Choose the original unit in the From Unit field.
3. Choose the target unit in the To Unit field.
4. Select decimal places if needed.
5. Click Convert.
6. Review the converted result, formula and conversion table.
7. Use Swap to reverse the conversion.
8. Copy or download the conversion report if needed.

Privacy Note: This Temperature Converter works directly in your browser using JavaScript. Your conversion values are not uploaded to our server.

Frequently Asked Questions

Is this Temperature Converter free?

Yes. This Temperature Converter is free to use and does not require signup.

Which temperature units are supported?

The tool supports Celsius, Fahrenheit, Kelvin, Rankine and Réaumur.

Can I convert Celsius to Fahrenheit?

Yes. Enter your value in Celsius, choose Celsius as the From Unit and Fahrenheit as the To Unit, then click Convert.

Can Kelvin go below zero?

No. Kelvin cannot go below 0 K because 0 K is absolute zero. The tool warns when a temperature is below absolute zero.

Does this tool upload my conversion data to the server?

No. This converter works directly in your browser using JavaScript. Your conversion values are not uploaded to our server.