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<p>[QUOTE=&quot;-jeffB, post: 25488003, member: 27832&quot;]I think it&#039;s proportional to the <i>surface area</i> of the coin, and the smaller the coin, the larger its surface area relative to its weight (the &quot;square-cube law&quot;). So a slick dime might be 20% underweight, but a half-dollar worn to the same degree might be only 5-10% underweight.</p><p><br /></p><p>Remember, though, as [USER=112]@GDJMSP[/USER] said above, the weight doesn&#039;t really start to drop much until you&#039;re down into very low grades (Good or below). As a rule of thumb, if the coin&#039;s rims are still distinct, it probably hasn&#039;t lost much weight.[/QUOTE]</p><p><br /></p>

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