There are proportional formulas on which scale can be based;

Design Issues
Written By Holden Hardcastle

The most famous is the Greek "Golden Mean." This is a mathematical formula of great visual elegance. it is arrived at by bisecting a square and using the diagonal of one half of the square as a radius to extend the dimensions of the square to become a "Golden Rectangle." In the proportion arrived at, a:b=c:a. The "Golden Mean" was used by the Greeks to design most of what they built from the classic Greek amphora to the floor plans of the temples and their elevations.

Holden Hardcastle

Creating beautiful, exciting, and positive experiences by working with inspired and driven people.

Over the last twenty years, I have produced award-winning strategic marketing campaigns. I am an experienced art and creative director who has led high-performing teams at companies across various industries. Working with inspired and driven individuals, I aspire to create beautiful, exciting, and positive experiences. Whether it is bringing people together through an application or developing a dynamic brand to change the world, I believe that inspired teams yield inspirational results.

https://holdenhardcastle.com/
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There are many other scale systems;
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The most vital factor in the establishment of scale is the measurement of man himself.