how to measure watch size mm

Daniel Parker

3 min read

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18-01-2025

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Knowing your watch size is crucial for comfort and style. A watch that's too big can look clunky, while one that's too small can get lost on your wrist. This guide explains how to accurately measure your watch size in millimeters (mm), covering different measurement methods and what those measurements mean.

Understanding Watch Size Measurements

Before we dive into the how-to, let's clarify what's being measured. Watch size typically refers to the diameter of the watch case, excluding the crown (the knob used to set the time). This is usually measured from one side of the bezel (the outer ring) to the opposite side, passing through the center. You might also see mentions of lug-to-lug measurement, which is the distance between the watch lugs (the small protrusions where the straps attach). This is a less common but equally important measurement for fit.

Method 1: Using a Ruler

This is the simplest method, requiring only a ruler with millimeter markings.

Steps:

1. Lay your watch face down: Place the watch on a flat surface with the face down.
2. Measure the diameter: Use the ruler to measure the distance across the watch case, from bezel edge to opposite bezel edge, excluding the crown.
3. Record the measurement: Note the measurement in millimeters (mm).

Important Note: Ensure the ruler is placed precisely and accurately to get an exact measurement. A slight misalignment can lead to inaccuracies.

(Image of a watch being measured with a ruler. Alt text: Measuring a watch diameter with a ruler)

Method 2: Using Calipers

Calipers offer the most precise measurement. They are specifically designed for measuring the dimensions of objects.

Steps:

1. Position the watch: Carefully place the watch between the jaws of the calipers.
2. Close the calipers: Gently close the calipers until they snugly fit around the watch case.
3. Read the measurement: The measurement in millimeters (mm) will be displayed on the caliper's scale.

Important Note: Calipers can be purchased online or at most hardware stores. They are a worthwhile investment if you frequently measure objects with precision.

(Image of a watch being measured with calipers. Alt text: Measuring a watch diameter with calipers)

Method 3: Using a Watch Sizing App

Several smartphone apps are designed to measure watch sizes using your phone's camera. While not as accurate as calipers or a ruler, these apps can provide a reasonable estimate.

Steps:

1. Download a watch sizing app: Search your app store for "watch size measurement" or similar.
2. Follow app instructions: Each app will have specific instructions on how to use the camera to measure the watch.
3. Record the measurement: The app will display the measured diameter in millimeters (mm).

Important Note: Accuracy can vary depending on the app and the clarity of the image. It's best to use this method as a rough estimate rather than a precise measurement.

What Your Measurement Means: Choosing the Right Size

Once you have your measurement, you can use it to compare watch sizes and select a watch that fits your wrist comfortably. Generally:

• Small watches (under 38mm): Suitable for smaller wrists.
• Medium watches (38-42mm): A versatile size suitable for most wrists.
• Large watches (over 42mm): Better suited for larger wrists.

However, personal preferences play a significant role. Some people prefer larger watches on smaller wrists and vice-versa. Consider trying on different sizes before purchasing to ensure a comfortable and stylish fit.

Measuring Lug-to-Lug Distance

Lug-to-lug measurement refers to the distance between the lugs, crucial for overall fit on the wrist. It's often measured with a flexible ruler or tape measure. This distance affects how the watch sits and feels on the wrist; a longer lug-to-lug can feel oversized even if the case diameter is within a comfortable range.

Conclusion

Measuring your watch size in mm is straightforward using a ruler, calipers, or a dedicated app. Understanding your wrist size and the different measurements will help you choose a watch that looks and feels great. Remember to consider not only the diameter but also the lug-to-lug measurement for the best fit.