Temperature Converter
Convert temperatures between Celsius, Fahrenheit and Kelvin instantly. Includes absolute-zero validation. Private, browser-based and free.
About this tool
Convert any temperature between Celsius (°C), Fahrenheit (°F) and Kelvin (K). Enter a value in one unit and see the equivalents update immediately.
The converter understands absolute zero, so it can flag physically impossible values such as temperatures below −273.15 °C.
Examples
- 100 °C → 212 °F → 373.15 K
- 32 °F → 0 °C
- 300 K → 26.85 °C
Frequently asked questions
What is the formula for Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32. For example, 100 °C × 9/5 + 32 = 212 °F.
What is absolute zero?
Absolute zero is the lowest possible temperature: 0 K, which equals −273.15 °C or −459.67 °F. The tool warns when a value falls below it.
Is Kelvin written with a degree symbol?
No. Kelvin is written without a degree symbol — for example, 300 K, not 300 °K.
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