Celsius Fahrenheit Kelvin Converter
Convert a temperature between Celsius, Fahrenheit and Kelvin. Anything below absolute zero (−273.15 °C) is rejected rather than converted.
Frequently asked questions
What is the lowest temperature allowed?
Absolute zero: 0 K, −273.15 °C or −459.67 °F. Nothing can be colder, so a lower value is rejected with an error instead of a number.
Which formulas are used?
°F = °C × 9/5 + 32, K = °C + 273.15. Fahrenheit and Kelvin go back through Celsius, so every pair uses the same two steps.