Enter a number in either field, then click outside the text box.
F:
C:

Frequently asked questions:

How do I convert between Fahrenheit and Celsius?
No really, how do I convert between Fahrenheit and Celsius?
I'm getting tired of asking, how do I convert between Fahrenheit and Celsius?

Is there a temperature for which both the Fahrenheit and Celsius scales read the same?
What is it?

Why is this page so lame?

How do I convert between Fahrenheit and Celsius?
Type the temperature for one in one of the boxes above, and click outside the box.
The equations are in the JavaScript code for the calculator at the top of the page. Select "View Source" from your browser.

No really, how do I convert between Fahrenheit and Celsius?
The equation relating the two is C = (F-32) * 5 / 9

I'm getting tired of asking, how do I convert between Fahrenheit and Celsius?
OK

From F to C:
- subtract 32
- multiply by 5
- divide by 9

From C to F:
- multiple by 9
- divide by 5
- add 32

Is there a temperature for which both the Fahrenheit and Celsius scales read the same?
Yes, exactly one of the values on the Fahrenheit scale maps to the same temperature on the Celsius scale, and visa versa.

What is it?
Now that would be telling.

If you know algebra, you can use the equation relating F and C, along with the identity F=C to find the point.

Otherwise, you can plug values into the calculator until you find the point. Here's a hint, for very high temperatures, Fahrenheit reads higher than Celsius (212 is bigger than 100). For very cold temperatures, Fahrenheit will read lower (more negative) than Celsius. Good luck.

Why is this page so lame?
Yes, I do get this question. This page didn't start out as a temperature conversion reference. Back in the 90's, it was written as a quick demonstration of Javascript. That is the computer language that is used to drive the calculator at the top of the page. The original title was "The world's shortest JavaScript demonstration".

Not too long after that, Yahooligans picked up the link, and I started getting very confusing email. This FAQ contains the contents of the canned response to the questions posed in those emails.

DSS