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Converting wire wire diameter to gauge size?

Discussion in 'Electronic Basics' started by Gary Helfert, Aug 22, 2005.

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  1. Gary Helfert

    Gary Helfert Guest

    What is the formual to do so?
  2. Doug

    Doug Guest

    if you put copper wirw gauge sizes in google
    the first site listed is which
    gives you a bunch of information on copper wrie
  3. PeteS

    PeteS Guest

  4. Paul Hirose

    Paul Hirose Guest

    Wikipedia has a precise AWG formula:

    Unfortunately, it's arranged to convert AWG number to diameter. The
    original poster asked for the opposite conversion. Rearranging the
    Wikipedia formula to run that way gives:

    39 × log (200 × d)
    AWG = 36 - --------------------
    log 92

    where d = diameter in inches.

    The equation looks gnarly, but it's mostly constants and can
    be simplified to this approximation:

    AWG = -9.7 - 19.86 × log d

    That's accurate within ±.01 AWG, from 0000 to 50 gauge.
  5. steamer

    steamer Guest

    --Gauge is *approximately* the reciprocal of the diameter; i.e.
    1/8" wire = 8 gauge, etc. I think.


    Not true, It is close for some gauges but does not hold true across the
    board. And how would you determine 0 gauge or 00 or 000?

    Here is a link this page has the table...
  7. Bob Myers

    Bob Myers Guest

    It happens to work for 8 AWG (0.1285") , and reasonably
    well in the range right around there, but don't count on this
    as a general rule of thumb. For instance:

    1/20 = 0.05 but 20 AWG = 0.03196 (nom.) 0.05" wire
    (or at least the closest standard gauge to that) would be
    16 AWG.

    And at the other end, 2 AWG is 0.2576", not 0.5".

    And let's not even start to think that 0 AWG has an
    infinite diameter...:)

    Bob M.
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