Digital Micrometer

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How do I find the linear footage in a 10,000 lb coil of galvanized sheet metal.?

I have a digital micrometer and a scale to do it but i want to put a formula on a excel spread sheet so I can figure the linear footage for pricing.
The coil is 60 inches wide. I can weigh it and mic it how would I put all of this in the formula.

You need three facts - inside radius of the coil r, outside radius of the coil R, thickness of the sheet metal s.

Area of end of roll = pi*(R^2 - r^2)
When unrolled the area will be L*s

These must be the same so
L*s = pi*(R^2 - r^2)

L = pi*(R^2 - r^2)/s

So all you need to do is measure R, r which you can do at the end of the coil, and s which you can do at the end of the roll.

The weight and width of the coil are actually irrelevant. If you post the three measurements I have said then I'll work it out for you.

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