[Other SmartWatches] Lokifish Marz:
Watch size and case design

Case sizing

Something often ignored in the smartwatch world is proper case sizes. It's almost as if they are betting that the recent (past 5-10 years) over sized watch fad continues so they can ignore what is considered proper watch sizing. Speak with any watchmaker or jeweler with a reputation for quality and you will get some very simple rules.

A proper fitting watch should never be wider than your wrist. The strap should also never droop over the wrist. Apparently smartwatch makers never got that 100 year old memo;

Now there is a simple guide to proper sizing that many in the watch community agree on. It's called the the "Golden Ratio". The golden ratio is probably one of the most common seen ratios seen in the world. Architects, painters, car designers, and even nature uses it.

Now there cannot be a one size fits all of course, but you can get close. First one has to take into account certain commonalities in wrist sizes. The average man's wrist is about 7.5 inches in diameter, and the average woman's wrist is around 6 inches. A 40mm case diameter it puts you in between too large for women with small wrists, and too small for men with larger wrists. Additionally, if you look at the entire Rolex large unisex collection, it averages out to about 40mm. Other quality/luxury brands are also about the same.

At 40mm diameter it puts the near ideal display size at 31-33mm in diameter, or 1.2-1.3in . This allows for a Sports and Diver's model with functional bezel while giving enough leeway for a slightly smaller "dress" watch. Another factor in case design is the case/bezel to crystal ratio.

Bezel to display ratio

Dress/Formal

On most dress/formal watches they have a case/bezel to crystal ratio of about 1:0.937. This means the display diameter is 93% that of the case/bezel diameter. This allows for two things. Larger display or smaller case. Traditionally, dress/formal watches are smaller in size so I suggest a smaller case for this group.

Sports/Diver's

Here that average ratio is 1:0.8, or 80%. This gives a bezel that is not too fat or too thin while retaining enough width for markings.

Display resolution

240x240 and 320x320 are a little short on ppi. 400x400 is slowly coming available which puts a 1.2-1.3in display over the 300ppi mark should a source for such a size be found. This also puts the display at Nexus 4/iPhone 5 level of detail.

Square vs Round

Square smartwatches are often referred to as "not a watch" by the uninitiated. This is of course very far from the truth. Some of the generally agreed upon iconic watches are square. Part of the issue with smartwatches is an attractive square design is difficult. A perfect square is unpleasant to the eye but the wasted space around square displays is equally unpleasant. There is also the issue of orientation of rectangular displays. Most are horizontal which leads to a "fat watch" look. If square displays are to be used then a taper at the top and bottom should be used or a minimalist design. Here's some examples;

Tapered (tapered poses an issue with overall length being too great unless smaller displays are used)

Minimalist (even with lugs this can be a very attractive design)

(This is all based on a ton of research, informed smartwatch users complaints, and traditional watch users complaints, with a dash of personal opinion for flavor.)

EDIT:

Something to investigate. If a more suitable size can be found with a decent capacity or even custom size.