Not sure if this is helpful. Here is how I judge it without the ruler.
Base Card: 3x4 premium toploaders or RC toploaders if rookie card.
Framed Card, Topps Platinum/Mayo like thick card: (About 108 pt, thick toploaders)
Common Game Used: 138 pt.
Letterman, 197 pt.
Anything thicker than a letterman, or a bulging patch would be wise to measure with a ruler. If this post is not helpful, delete it. It is what I have learned from experience and fuzzy math.
I use BCW supplies only.