How To Measure Watch Case Size? (Guide To Measure Watch Size)

Nowadays, watches stand out as an indispensable piece of jewelry for most people.

However, due to the variety of models and sizes, it is not effortless to check the size of your watch exactly. 

Wearing a timepiece in a suitable size is essential for many reasons, which not only adds aesthetics to your look but also avoids nerve damage in your hands.

The article below includes detailed instructions on how to measure watch case size so that you have a great experience.

Tool You Need Before Measuring Watches Case Size

Before watch case begin measured, you need to use a caliper.

This is a size measurement tool used to determine the watch case diameter accurately. 

However, it is relatively complicated compared to using a ruler, so read the instructions below to use it correctly.

Regarding the design of the caliper, it consists of a beam and a movable plastic or metal attachment to aid in the measurement.

One side of the caliper is a set of exterior-facing jaws used to calculate length and diameter.

The other side also has a set of jaws used to take internal measurements, like the distance between the ticker’s lugs.

These two sets of jaws are both connected to the beam and the movable attachment for easy calculation.

On the attachment is a knob to adjust the jaw.

Besides, there are screws to hold the jaws in place when measuring.

In terms of features, the digital caliper is supplemented with a battery compartment and an ABS button to set the measurement to zero, and a unit conversion button (inches-millimeter).

How To Measure Watch Case Size (Detailed Instructions)

  • Measure the watch face sizes

First of all, measure your watch’s case diameter.

Next, place the interior-facing jaws of the caliper on two opposite ends of the watch while avoiding any possible scratches.

Finally, be sure to measure across the center of the face and read from the 3 o’clock to the 9 o’clock position. 

If your meter has an additional crown or features that prevent the accuracy of this measurement, a slight difference may be read, but it does not significantly affect the results.

For watches that are not perfectly round, please measure where the diameter is the most minor, still making sure to cut across the face center.

While this is not the perfect solution, it is the most accurate way to visualize how the watch rests on your wrist.

After placing the caliper correctly, read the size measurements on the caliper to determine the size of its case.

Below are the different case sizes corresponding to your wrist circumference.

Please refer to choose the correct model:

  • Wrist circumference 6 inches: 34mm-38 mm cases.
  • Wrist circumference 7 inches: 39mm-42mm cases. 
  • Wrist circumference 8 inches: 44mm-47mm cases. 
  • Measure lugs width 

Measure lugs width also plays an important role.

Because the lug width directly affects the strap width you need to fit your ticker.

Place one exterior-facing jaw of the caliper in each lug and take the measurement.

Make sure you check from the inside of the lug, not measure outer lugs, to ensure absolute accuracy.

  • Measure the lug-to-lug distance 

To distinguish the lug width measurement above, this measurement refers to the distance between the lugs on opposite sides of the watches.

It relates to symmetry when the watch is on your hand, so consider it carefully for aesthetics.

Use the interior-facing jaws of the caliper to measure the distance between two parallel lugs on opposite sides.

This also helps ensure watch band width comfort when you wear the accessory on your wrist.

  • Watch case thickness measurements

Watch case thickness measurement is also essential, although it is less attention than the 3 mentioned above.

Specifically, a larger case size means a thicker watch.

Measuring its thickness is relatively simple.

Firstly, lay your watch flat and use a ruler, standing up against it measure.

This method does not use a caliper, as its jaws can clamp onto the face crystal.

Watch thickness varies less than case size, typically between 7 and 9 millimeters.

Finally, you can refer to this video for a more transparent insight into measurement watch case. 


1. What are the materials used to make watch cases? 

Watch case is made from various materials. (Source)

However, there are some most popular materials associated with some outstanding properties, including metals and non-metals: 


  • Stainless Steel – The material is favored due to its high quality and resistance to corrosion. Easy to work with and reasonable price. Its only downside is relatively heavy compared to other metals.
  • Titanium – If you need to use your watch frequently, titanium is a perfect choice for the case. Titanium is exceptionally light, hard, and corrosion-resistant. However, titanium’s dull gray color makes it less appealing. 
  • Aluminum – Aluminum is an unpopular material due to its poor strength and susceptibility to deformation. However, its outstanding benefits are extreme lightness and excellent corrosion resistance. Besides, the wonderful mat sheen of aluminum also increases your watch aesthetics. 
  • Precious metals – Some versions of high-end timepieces use precious metals such as gold or platinum for the case. However, there is no real benefit to using these metals, which is a waste of money. 


  • Wood – Wooden watch cases are becoming more and more popular to ensure environmentally friendly. These materials are light and comfortable, but they have a more fragile appearance than metals and have cheap quartz movements. These features decrease the lifespan of the watch. 
  • Plastic – Plastic is one of the most common materials for watch cases in the low-end market. However, that doesn’t mean plastic-cased models are cheap; some brands have made special plastic products with even more excellent effects. 

2. What are the different types of watch case shapes?


It is apparent that round is the most popular watch case shape on the market, in both high-end and low-end versions.

The round case is considered the easiest way to display and read the time, which is the main reason for its popularity.

It is also an excellent choice for those who love the beauty of minimalism.


This shape is used widely due to its fashionability.

The square case is the prevalent style used for dress watches. (Source)

Over time, manufacturers have increased the popularity of this shape by using it for athletic and outdoor watches. 

This is truly an eye-catching case shape for most people.

Some famous brands such as G-Shock, Gucci, Tory Burch, and Audemars Piguet have released their new models with the same design.


Rectangular cases are not very common in modern life.

However, it is one of the world’s first case shapes that are considered classic beauty.

This shape was first introduced when Cartier released the Cartier Tank in 1917.


The oval watch case shapes take inspiration from round ones and are vertical in nature.

It is usually accompanied by a slim and elegant band that creates a luxurious and beautiful look.

That is a reason why this shape is so popular with women. 

Many famous brands such as Diesel, Skagen, Michele, and Tissot have produced beautiful oval watch cases. 


It is undeniable that watches are essential pieces of jewelry, so knowing how to measure watch case sizes is never useless.

Hopefully, the above article has assisted you in understanding the process clearly.

Thank you for reading.

Last Updated on May 10, 2022 by The o.d.m team