How Do I Convert Celsius to Fahrenheit?

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By By Steve Pool

Story Published: Jan 9, 2003 at 8:50 PM PST

Story Updated: Mar 13, 2008 at 12:13 PM PST

SEATTLE - Those who travel back and forth to Canada, or other countries on the metric system, will find temperatures in Celsius.

The official way to convert C to F is to multiply C by 1.8, and then add 32. But if you'd like a quick way to get a rough guesstimate and give your brain a break from multiplying by 1.8, you can instead take your C reading, double it, and then add 30. It'll get you within a few degrees. (20 degrees C * 1.8 = 36, add 32, = 68 degrees. Quick way: 20*2 = 40, plus 30 = 70 degrees.)

To go from F to C, you take F, subtract 32, then divide by 1.8. Or the easy way: Subtract 30, then take half.

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