Converting wire wire diameter to gauge size?

There's a handy conversion chart at:

Cheers

PeteS

if you put copper wirw gauge sizes in google the first site listed is

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:

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.

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...

--Gauge is *approximately* the reciprocal of the diameter; i.e.

-- "Steamboat Ed" Haas : My shop is open to Hacking the Trailing Edge! : visiting dog-nitaries...

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:

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.