The size of incomplete planchets..

[Maxorin]

Is there an easy way to calculate exactly how much of a coin is missing, in %?

[diamond]

Sure, weigh it to the nearest tenth of a gram and see how much is missing relative to a coin of normal weight.

[Maxorin]

Thank you.

Is there other ways to calculate it or is weight the way to go?
I`m thinking slabbed coins for example could be hard to weigh
like that. And coins you have pics of, but you dont have the
coin itself.

[diamond]

You're never going to get an accurate percentage weight loss from a photo or from inside a slab. Metal expands under the force of the strike, and this often reduces the size of the original clip. Inaccuracy is greatest when the coin is struck out-of-collar, when there are multiple clips involved, when the clip is extremely small or extremely large, or when the clip is irregular.

[Maxorin]

Ok, thanks, had a feeling it could be hard to get done but started wondering if there could be some math formula to figure it out with.

[diamond]

Try this: To find the area of a curved clip, use the following formula: pi X w X d / 4 with w = maximum width and d = diameter.

All I'm saying is that any answer you get provides precision without accuracy.

[19Lyds]

Try this: To find the area of a curved clip, use the following formula: pi X w X d / 4 with w = maximum width and d = diameter.

All I'm saying is that any answer you get provides precision without accuracy.

I've been wondering about this for a long time Mike and now wish I hadn't failed basic Algebra!