What is the design rule for aesthetic rounded corners?

When is a rounded corner just right, when is too round or too squary ?
There are a bunch of rules in design such as the golden rectangle, the thirds, etc, is there one for rounded corners ?

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Answer

I don’t think there is a rule, or even a suggestion about the size of rounded corners. That is purely aesthetic.

There are two key things to consider though:

  1. Consistency. Standardize the radius over a project. Avoid mixing and matching rounded corners of various sizes without a good reason.
  2. Concentricity. By all means, make sure your corners stay concentric if applicable. Our eyes expect to see concentric corners. Scaled corners just look odd.

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See the How to compute the radii (radiuses) of corners for concentric rounded rects for a little more info.

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Source : Link , Question Author : WaterBearer , Answer Author : Community

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