Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine, with absolute zero enforced.
Your result will appear here as soon as you add some input.
How to use it
- 1Enter your values in the fields above.
- 2The answer and the working appear immediately below.
- 3Check the working to see the formula with your numbers substituted.
Example
Input
100 Celsius
Output
212 Fahrenheit, 373.15 Kelvin
Formulas used
- F = C x 9/5 + 32
- C = (F - 32) x 5/9
- K = C + 273.15
About the Temperature Converter
Temperature scales are affine rather than proportional: they differ in both the size of a degree and the position of zero. That is why the conversion needs a multiplication *and* an addition, and why you cannot convert a temperature by scaling alone.
It also means a temperature difference converts differently from a temperature. A rise of 10 degrees Celsius is a rise of 18 degrees Fahrenheit, not 50.
Values below absolute zero are rejected rather than converted, since they do not describe anything physical.
Questions people ask
Is your figures uploaded to a server?
No. This tool runs entirely in your browser using standard web APIs, so your figures never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.