Howdy Folks,
This Everlast website has an excellent welding calculator. Miller does also.
Since it's not adviseable to fuse metals together with a computer nearby, I find that is more convienient to keep some Miller welding calculators handy.
You can order up a 3 pack that handles Stick, Mig and Tig for 4 bucks shipping included to the lower 48.
The link is: http://www.millerwelds.com/resources/tools/#calculators
Don't get me wrong! This is not an endorsement for Miller except for the functionality of thier welding calculators. If Everlast offered these calculators, I would use them instead.
Best Regards
Don