How to Size a Watch for Your Wrist

A watch that fits well looks more expensive, feels more comfortable, and is far less likely to sit in a drawer. Sizing is about more than case diameter: the shape of your wrist, the lug-to-lug length, and the strap width all matter. Here is the simple process we use every time we recommend a watch.

Step 1: Measure your wrist

Use a soft tape measure or a strip of paper. Wrap it around the flat part of your wrist, just below the wrist bone, where the watch will sit. Mark the overlap and measure it against a ruler. Most adult wrists fall between 6 and 7.5 inches (15–19 cm).

Step 2: Match case size to wrist size

As a rough rule of thumb:

• Under 6.5 inches: 34–38mm cases wear best.
• 6.5–7 inches: 38–42mm is the versatile sweet spot.
• Over 7 inches: 42–44mm and larger look balanced.

Step 3: Check lug-to-lug length

Lug-to-lug is the distance from the top of the top lug to the bottom of the bottom lug. A 40mm watch with a 50mm lug-to-lug wears much larger than a 40mm watch with a 45mm lug-to-lug. If your wrist is flat, you can go longer. If it is round, keep the lug-to-lug close to or below your wrist width.

Step 4: Strap width and taper

A strap that is too wide can overhang; one that is too narrow looks undersized. Standard lug widths are 18mm, 20mm, and 22mm. A slight taper toward the buckle can make a chunky watch look more refined.

What to do next

Once you know your numbers, filter our picks by case size. Our best watches under $300 and best watches under $500 guides list lug-to-lug and case diameter for every pick.