Convert temperature units
Convert Celsius, Fahrenheit and Kelvin with absolute-zero validation.
Input & settings
How to use this tool
Enter a temperature and choose both scales. Values below absolute zero are rejected.
Limits and behavior
Results use floating-point arithmetic, rounded to 12 significant digits. Inputs are limited to an absolute value of 10^12 and results to 10^15. Absolute zero is 0 K, −273.15 °C or −459.67 °F. A 10^-9 K rounding tolerance is applied at that boundary. Input is limited to 1 MB and output to 3 MB. No input content is saved by CraftAI.
Celsius, Fahrenheit and Kelvin converter
Convert a temperature between Celsius, Fahrenheit and Kelvin. This temperature unit converter is useful for cooking, weather comparisons, lab readings and calculations involving absolute temperature.
Can I convert below absolute zero?
No. The converter checks absolute-zero limits, helping identify physically invalid inputs rather than silently treating them as valid temperatures.