Do you need a quick formula for converting Celsius to Fahrenheit? If you're in a pinch and have no precise means of converting temperatures, try this method. It was given to me by fellow CFI, Bob Crystal.
Convert 15 degrees Celsius to degrees Fahrenheit: 
Step 1: Double the Celsius value (15 + 15 = 30)
Step 2: Add 30 to this number (30 + 30 = 60)
15 degrees Celsius is approximately 60 degrees Fahrenheit (59F to be exact).
Within the typical range of temperatures you're likely to use, the error should only be a few degrees. Remember, this is only an approximation to be used when you have no other means of converting.
For more information on this subject, see "Tricks of the Trade" and "Taking Advice: Remembering those helpful hints."
Rod Machado
Rod Machado is a flight instructor, author, educator, and speaker.
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