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Is there a relative scale to which one can estimate the size of a shark by looking at its dorsal fin?

I know it will differ from species to species, but is there a general guideline maybe for each?

Say a Great White shark with a dorsal fin of 40 cm (1.3 ft).

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I don't think there is a general guideline, however I did find a guide by the Food and Agriculture Organization of the United Nations that has the calculations.

The calculations for a Great White are on page 38, and the directions for the calculations start at page 13. I wish I could find a simple rule of thumb, but it looks like there is a good bit of math involved.

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