Tuesday, October 21, 2014

287: Fahrenheit to Celsius

We all know the conversion from °C to °F: multiply by 9/5 (or 1.8, if you can't handle those evil fractions) and then add 32.

The conversion from °F to °C is more complex: subtract 32 and then multiply by 5/9 (or 0.555555555).

That's cumbersome for mental math.

Here's a shortcut: subtract 30 and divide by 2 OR multiply by 2 and add 30.

  • How good is that shortcut?
  • Are there temperatures that it's okay for and other temperatures that the shortcut is too far off?
  • Is this just another stupid shortcut? NixTheTricks ?

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