The Leather Watch Strap Guide
This is the hub I actually started from. I collect watches, some vintage, and for years I couldn't find straps in the sizes I actually needed off the shelf, so I started making my own. Everything else at this workshop grew out of that one problem. This guide covers what actually matters when choosing or making a leather watch strap: getting the size right, picking the material, and keeping it looking good for years instead of months.
Table of Contents
- Why strap sizing is where most people go wrong
- How to measure your watch's lug width
- Leather watch strap sizing guide
- Leather vs. metal watch bands
- How to care for a leather watch strap
- Common mistakes
- FAQ
Why Strap Sizing Is Where Most People Go Wrong
A watch strap that's the wrong width doesn't just look slightly off, it physically won't fit, or it fits with visible gaps at the lugs that make an otherwise good watch look cheap. Unlike a wallet or a bag, a watch strap has almost zero tolerance for "close enough." The lug width has to match, within a millimeter, or the strap simply won't sit right. This is the single most common reason people end up disappointed with a strap purchase, and it has nothing to do with leather quality.
How to Measure Your Watch's Lug Width
Lug width is the distance between the two lugs on your watch case, measured in millimeters, where the strap attaches. Most watches fall between 16mm and 22mm, with 20mm being the most common size on men's watches. Measure with a ruler or calipers placed directly across the gap between the lugs, on the inside edge, not the outside.
If you don't have calipers, a simple ruler works, just measure carefully and round to the nearest even number, since lug widths are almost always even (16, 18, 20, 22), with a few odd exceptions (19mm, 21mm) mostly on older or vintage pieces. If you genuinely can't tell, most watch manufacturers list the lug width in the technical specifications, searchable by model number.
Leather Watch Strap Sizing Guide
Beyond lug width, two more measurements matter for how a strap actually fits and functions:
Strap length needs to match your wrist size, typically given as two numbers (like 75mm/115mm) for the short and long sides of the strap. Too short and it won't close on a larger wrist; too long and the excess flaps past the buckle.
Taper refers to whether the strap narrows from the lug width down to the buckle. A straight (non-tapered) strap stays the same width throughout, which suits larger or more casual watches. A tapered strap, common at 20mm down to 16mm or 18mm down to 14mm, gives a dressier, more traditional look, especially on smaller or more formal watches.
| Lug Width | Common On | Typical Taper |
|---|---|---|
| 16mm | Smaller dress watches, some women's watches | 16mm to 12-14mm |
| 18mm | Classic dress watches, some vintage pieces | 18mm to 14-16mm |
| 20mm | Most common men's watch size | 20mm to 16-18mm or straight |
| 22mm | Larger sport and dive watches | 22mm to 18-20mm or straight |
Leather vs. Metal Watch Bands
Leather straps are lighter, more comfortable against skin over long wear, and develop character over time. Metal bands are more durable against water and daily knocks, need less frequent replacement, but sit heavier on the wrist and can pull arm hair uncomfortably. Neither is objectively better; it depends on what you actually do while wearing the watch. Leather struggles with sustained water exposure (swimming, heavy sweating during exercise) unless it's specifically treated for that. Metal handles all of that without a second thought, but many people find it less comfortable for all-day wear, especially in warm climates where a metal band can feel hot against skin.
How to Care for a Leather Watch Strap
Wipe the strap with a barely damp cloth after exposure to sweat or moisture, let it air dry fully away from direct heat, and condition lightly every few months depending on how often it's worn. Sweat is the biggest threat to a leather strap specifically, more than most other leather goods, since it sits directly against skin for hours at a time, every day. Salt and oils from sweat break down leather fibers faster than almost any other regular exposure, which is why watch straps often need more frequent light conditioning than a wallet or belt gets.
Rotating between two straps, if you wear a watch daily, gives each strap time to fully dry out between wears, which meaningfully extends the life of both compared to wearing one strap every single day without a break.
Common Mistakes
- Buying a strap based on the watch's overall look rather than measuring lug width first. A strap that doesn't fit the lugs is unusable regardless of how good it looks in a photo.
- Ignoring taper and buying a straight strap for a watch that traditionally wears tapered, or vice versa. It changes the whole visual proportion of the watch.
- Wearing the same leather strap daily without rotation, especially in hot climates or during exercise. Sweat exposure without recovery time between wears shortens a strap's life significantly.
- Assuming leather straps are automatically less durable than metal. With proper care and rotation, a quality leather strap easily lasts a year or more of daily wear before needing replacement.
FAQ
Can I use a strap that's 2mm smaller than my lug width with an adapter?
Adapters exist for some size mismatches, but they add bulk and can look visibly off compared to a strap sized correctly for the lugs. It's better to get the correct size when possible.
How often should a daily-worn leather watch strap be replaced?
With proper care and occasional rotation with a second strap, a quality leather strap typically lasts 1 to 3 years of daily wear before the leather at the buckle holes or fold points starts showing real wear.
Is a thicker leather strap always more durable?
Not necessarily. Thickness needs to match the watch case size and lug width; an overly thick strap on a thin case looks disproportionate and can be less comfortable, without adding meaningful durability over a well-made medium-thickness strap.
Do leather watch straps work for swimming or heavy exercise?
Not well, without specific waterproof treatment. For regular swimming or heavy sweating activities, a metal band or a specifically waterproofed strap material is the more practical choice.
Written from the bench at Brown Bear Leatherworks, where this whole workshop started. See our watch straps, or read the full craft guide on leather and stitching.