[RPG] standard d10 dimension ratio

dice

Of the six standard game dice (d4, d6, d8, d10, d12, d20, ignoring labeling variants), all but one of them are regular polyhedra, meaning their size varies in only one dimension (scale). The d10, however, can be independently scaled both radially and vertically. Is there a standard value for the ratio of these dimensions?

Observing my own dice, the ratio appears to be about 1.1 (in other words, the maximum width is about 10% larger than the height), but it would be nice to find a standard value for this property.

Edit:
I played around with a few values for the ratio and came up with six semi-reasonable constraints. Overall, the top-right shape seems to most closely match my dice. The ratio is about 1.11, and is defined by the side angle of the kite being 90 degrees.

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Best Answer

There's no industry standard.

The consistency of d10s that you've observed is much more likely due to Chessex's dominance of the hobby dice market. They have standard designs and moulds for their dice that ensure consistency within their own dice lines.

If you're perceiving a standard d10 geometry, it's very likely because you're looking at different dice all made by Chessex, or made by another company that is following the market leader's lead.