How Long Should a Watch Strap Be?
How Long Should a Watch Strap Be?
Written by: Will Parker | Published on October 5, 2026 | Time to read 1 min
Introduction
There is no single watch strap length that suits every wrist, but many standard two-piece straps measure around 180mm to 200mm in total.
As a general guide:
- Medium, around 110/70mm: usually suits wrists below 6¾ inches.
- Regular or Long, around 120/80mm: usually suits wrists between 6¾ and 7¾ inches.
- XL, around 120/100mm: usually suits wrists above 7¾ inches.
The right fit also depends on the size of your watch, the position of the adjustment holes and how the manufacturer sizes its straps. If you already have a strap that fits well, measuring it is one of the easiest ways to choose a replacement.
Table of Contents
Get the Right Fit!
What Do Watch Strap Length Measurements Mean?
Two-piece watch straps are usually listed using two measurements, such as 120/80mm.
The first number is the longer part of the strap with the adjustment holes. The second is the shorter section attached to the buckle.
So a 120/80mm strap has:
- a 120mm long end
- an 80mm buckle end
- a total strap length of 200mm
The buckle itself and the watch case are not included in these measurements.
Do not confuse strap length with strap width. A measurement such as 20mm usually refers to the width where the strap attaches to the watch.
Our Watch Straps with the Most Length Options
Watch Strap Length Chart
The following is a useful starting point for a standard two-piece watch strap.
| Wrist Size | Strap Size | Length |
|---|---|---|
| Below 6¾ in / 17cm | Medium | Around 110/70mm |
| 6¾–7¾ in / 17–19.7cm | Regular or Long | Around 120/80mm |
| Above 7¾ in / 19.7cm | XL | Around 120/100mm |
These are general measurements rather than fixed industry standards. Strap manufacturers use different sizing, and Watch Obsession stocks many other lengths, including shorter, intermediate and extra-long options.
Always check the measurements on the individual product page before ordering.
Once you know the length you need, browse our watch straps to compare the sizes, materials and styles available.
How to Measure Your Wrist for a Watch Strap
A soft tape measure is the easiest way to measure your wrist.
- Wrap the tape around your wrist where you normally wear your watch.
- Keep it comfortably snug without pulling it tight.
- Record the measurement in millimetres or inches.
- Compare it with the sizing information for the strap you are considering.
- If you do not have a tape measure, wrap a piece of string or strip of paper around your wrist, mark where it meets and measure it against a ruler.
Measure Your Existing Strap Too
If your current watch strap fits well, it can be an even better guide.
Remove the strap and measure the two sections separately, excluding the buckle. For example, if one side measures 120mm and the other measures 80mm, a 120/80mm replacement is a good starting point.
You do not necessarily need exactly the same length, but it gives you a useful measurement to compare with the straps you are considering.
How Should a Watch Strap Fit?
A correctly sized strap should fasten comfortably without needing to use the very first or last adjustment hole.
Ideally:
- the buckle should sit roughly in the centre underneath your wrist
- you should have enough adjustment to tighten or loosen the strap
- the end of the strap should pass neatly through the keepers
- the watch should feel secure without pinching your wrist
If you are fastening the strap close to its last hole and the end barely reaches the keeper, the strap is probably too short.
If you use one of the first holes and have a large amount of excess strap beyond the keepers, a shorter size may fit better.
Does the Size of the Watch Affect Strap Length?
Yes. Wrist circumference is the main measurement to consider, but the watch case also takes up space around your wrist.
A larger watch with a long lug-to-lug measurement can therefore fit differently to a smaller watch using a strap of the same length.
This is particularly worth considering if your wrist measurement sits close to the limit between two strap sizes. Look at the fit of your existing watch and strap as well as your wrist measurement before choosing a shorter or longer option.
Strap Length Is Not the Same as Strap Width
Strap length determines how the watch fits around your wrist. Strap width determines if the strap fits between the lugs of your watch.
For a standard watch, measure the gap between the inside edges of the lugs. A watch with a 20mm lug width will normally need a 20mm strap.
You may also see a strap described as 20/16mm. This usually refers to width rather than length. It means the strap measures 20mm where it meets the watch and tapers to 16mm at the buckle.
If you know the width you need, you can browse Watch Obsession straps by size, including popular 18mm, 20mm, 21mm and 22mm watch straps.
Do All Types of Watch Strap Use the Same Length System?
No. Measurements such as 120/80mm mainly apply to traditional two-piece straps.
- One-Piece straps use one continuous length of material and are sized differently. Depending on the design, excess material can usually be passed back through the keepers.
- Deployment straps use a folding clasp rather than a traditional pin buckle. They may still have two separate strap pieces, but the clasp design can affect how the strap fits, so check the individual sizing information.
- Erika's Originals MN straps are selected using wrist size and have an adjustable construction.
- Perlon straps do not use fixed adjustment holes. The buckle pin passes through the weave, giving you more choice over where the strap fastens.
- Metal watch bracelets are usually adjusted by adding or removing links rather than choosing a conventional strap length.
Fitted rubber straps and straps made for specific watch models can also use their own sizing, so check the product details before ordering.
You can browse our full range of leather, rubber, nylon and other watch straps, with sizing information provided for individual products.
Common Watch Strap Sizing Mistakes
- Choosing by the size name alone. One brand's Medium may not measure the same as another's, so compare the actual measurements in millimetres.
- Buying a longer strap just to be safe. Too much excess strap can look untidy and may leave the buckle sitting in the wrong position.
- Ignoring the size of the watch. Case and lug-to-lug dimensions also affect how the watch and strap sit on your wrist.
Conclusion
Finding the right strap length comes down to three simple steps: measuring your wrist accurately, checking the measurements of your current favourite strap, and factoring in the size of your watch case.
Taking a couple of minutes to double-check these numbers before ordering ensures your replacement strap fastens securely, sits comfortably, and looks perfectly proportioned on your wrist.
The Author: Will Parker
Will Parker is the Head of Media at WatchObsession and has been with the company since 2020. As our dedicated photographer, videographer and content creator, he has changed more buckles, straps and clasps than we're able to count, and his own personal watch collection grows every year—although his strap collection is growing faster.
Watch Strap Length FAQs
What is the standard watch strap length? ▼
There is no universal standard watch strap length. Two-piece straps measuring around 180mm to 200mm in total are common, often with measurements such as 110/70mm or 120/80mm.
What strap length do I need for a 7-inch wrist? ▼
A 7-inch wrist measures around 17.8cm. A Regular or Long strap measuring around 120/80mm is usually a good starting point. Check the measurements of the individual strap and consider the size of your watch before ordering.
When do I need an XL watch strap? ▼
As a general guide, wrists above around 7¾ inches may need an XL strap. A typical XL two-piece strap measures around 120/100mm, although exact lengths vary between manufacturers.
Are men's and women's watch straps different lengths? ▼
You do not need to choose a strap based on gender. Your wrist measurement is a more useful guide. Smaller wrists generally need shorter straps, while larger wrists usually need longer ones.
Still Not Sure Which Watch Strap Length You Need?
If you are buying a replacement strap from Watch Obsession and are unsure which size to choose, contact us with your wrist measurement, watch model and the strap you are considering.
Our team can help you check the sizing and find the most suitable option for your watch.