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4 Answers

Converting F to C and C to F

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General Aviation, Private Pilot

What is the proper mathematical formulas for converting C to F and F to C?  

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4 Answers



  1. Steve Pomroy on Feb 10, 2011

    Hi Kyle.
     
    Most manual flight computers have a conversion scale on them, and the electronic versions normally have a built-in function.  But if you really want to use the equations, here they are:
     
    F = ((9/5) * C) + 32
    C = (5/9) * (F – 32)
     
    Cheers,
    Steve
    http://www.flightwriter.com

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  2. skyboyCFI on Feb 11, 2011

    The easiest way is to subtract 30 (freezing temp) then divide result by 2. For F to C.

    For C to F just reverse : Cx2 + 30

    Example: 10C = 10×2=20. 20+30=50F
    70F = 70-30=40. 40/2=20C

    Near exact, for quick reliable conversion. Just remember for F to C subtract 30 divide by two.

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  3. Brian Campbell on Feb 11, 2011

    I work in the airlines and have to do the conversions often to PA purposes.  I have just remembered that -18=0 0=32 10=50 20=68 30=86  I then interpolate in my head make a somewhat educated guess.  
    Another way we often do it is (((C * 2)-10%) + 32))  Example would be 10C converted:
    10*2=20
    20-10%=18
    18+32=50

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  4. John D. Collins on Feb 11, 2011

    Brian,
     
    You can add to your data points, when it is -40 degrees outside, is it F or C?  Trick question, the answer is yes, -40 C = -40 F.

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