Converting wire wire diameter to gauge size?

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

1. Gary HelfertGuest

What is the formual to do so?

2. DougGuest

if you put copper wirw gauge sizes in google
the first site listed is http://www.powerstream.com/Wire_Size.htm which
gives you a bunch of information on copper wrie

4. Paul HiroseGuest

Wikipedia has a precise AWG formula:
http://en.wikipedia.org/wiki/American_wire_gauge

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. steamerGuest

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

6. DBLEXPOSUREGuest

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?

http://www.powerstream.com/Wire_Size.htm

7. Bob MyersGuest

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.