Speaker wire gauge

I like Xti16's method the best. I thought I favored Audiofeil's, but I don't understand why you have to include your zip code.

Here is the simplest calculator I found.
http://home.hiwaay.net/~rgs/awgcalculator.html
Not many brain cells needed for this LOL

Or you can calculate by this method:
Double the number of speakers in your system.
Add your age.
Subtract number of cars owned.
Add the temperature of your listening room.
Subtract the humidity of your listening room.
Add your zip code.
Subtract your area code.
Check Al's link (above)

"You don't even have to calculate since area doubles every 3 steps. 4 wires = 4 x area = 6 steps. 24-6=18"

An easier way for me to remember is that the change is the same as with dB. Double the number of (same-gage) conductors (power) and the gage number (or deciBels) changes by 3. So 2 24s = 21g., and 2 21s (AKA 2 24s) = 18g.
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You don't even have to calculate since area doubles every 3 steps.

4 wires = 4 x area = 6 steps. 24-6=18.

18 gauge. You can calculate that from the resistance numbers in this wire gauge table, by dividing the resistance number for 24 gauge by 4, and looking up the corresponding gauge.

Regards,
-- Al