Formula for determining watch size

While this is a personal preference, there is a certain visual aesthetic that is related to wrist size. Some people have used circumference of the wrist, but I think diameter is a better value to use. My wrist is small, but also muscular so using circumference is kind of artificially inflated.

So using a caliper or a ruler, my wrist diameter is about 57mm. You then multiply that by 0.62 and 0.68 for the min and max of the range and for me I get 55.34- 38.76mm. This checks out as I generally prefer watches that are 35-38mm, and going above this it appears too large and below too small. I cannot remember where I saw this formula, but it was years ago.

I do have some vintage watches that are about 33mm, but with a large dial and slim bezel they appear larger. My largest watch is 39mm. Actually I do have an Invicta that is over 40mm, but I never wear it because it looks rediculously large, though when I bought it years ago my wrist was actually larger and more muscular.

https://theslenderwrist.com/watch-size-guide/

Using this calculator, if I input my wrist circumference size of 7 in., it gives a maximum case diameter of 44mm, which is WAYYYY too big!

Got nervous about this thread for a moment.

The formula is:

Just wear what you like.

I think people have taken this too seriously. As I said some watches will wear larger or small than their measured size, and this is a very general guide. Not to mention how much personal preference will steer a decision. I thought it fascinating that the minimum and maximum of what I considered wearable for my wrist coincided with the results of this formula. I thought this was really cool.

Actually its mostly psychological, and dependent on what one is used to…which is dependent on what one most recently wore…so it changes all the time. If one spends two weeks wearing say a 45mm watch…then puts on a 36mm watch…it feels ‘small’ initially. Until the brain gets used to it. And vice versa. Truth is, both are great at least on my wrist size and i have realized this psychology a while ago so its not a limitation and there is no formula. Naturally that all scales with wrist size…some folk can wear 33mm watches up to 42mm…

If it starts looking like a dinner plate on the wrist…then maybe its a bit big…but if one is ok with it, then thats all that matters.