How to calculate wire length when rolling down from larger gauge

Hi Folks,

I tried to search this but I hardly know how to word the search. So

here’s what I need to do. I’m going to roll down/pull/hammer 8 ga (my

calipers measure 5.2 mm) sterling wire to 3 mm. I want to end up with

about 240 mm of the 3 mm wire, and I don’t want to have much extra 3

mm wire, in order to save as much in the 8 ga length for future

projects. So I calculated the square mm crossection of each and set

up a ratio and multiplied that on my desired length of 3 mm wire, as

follows:

3 mm/5.2mm x 240mm equals length of 5.2 mm to start with

Or

18.849/32.6716 x 240 equals 138.46 mm or 5.45"

This seems like it’s in the ballpark for a bracelet but I don’t

know. Does anybody know if I’ve got this right?

Thanks for all the wonderful sharing from you all.

Dennis fisher