Watch strap size: Lug width and width of buckle measurement help!

This post is another one in our series helping you with everything you need to know about watch straps!

Today’s topic is watch strap sizes and measurement:

Lug Width : We’ll start with the most important measurement of a watch strap.  If your new strap does not have the same lug width as your previous strap, or if you don’t have that as a reference, the distance between the two lugs at the bottom or top of the watch (these are always the same), then your watch strap will not fit! This means you need to measure the distance between the two lugs as shown in the picture below, to find the lug width of your watch. If the lug width of the new strap you’d like is not the same as your watch, please choose a different strap in the correct size!

Lug Width Measurement

Length of Strap or Band:  This is exactly what it says on the tin, the length of the watch strap, from one end to the other. By this, we mean the length of the 2 halves from one end of the leather (or other material) to the other.  The buckle is not included in this value.  This length however is not the maximum wrist circumference for which the watch strap is suitable for.  The length of the watch* is also a factor in finding out what length watch strap you need, along with the circumference of your wrist, and which hole of the normally 5 available in a watch strap you’re happy to wear the watch strap in.  The last hole is usually approx. 3cm from the end of the watch strap.

* to measure the length of your watch, remove the strap from your watch and refit the spring bars to your watch.  Now take a ruler  and measure from one spring bar to the other along the line of  12 and 6 o’clock.

Taking this into account, the rough equation for working out the length of watch strap you need is:

(Circumference of your wrist) – (Length of your watch) + (3cm)


(the approx. length of the watch strap you require)

Please note this is a guide only.  If you’re not sure if the strap will fit, please contact our
Customer Service

Length of Watch Strap

Width of Buckle: This could also be called „width of clasp“ and stands for the width of the strap where it attaches to the buckle or clasp.  If you’d like to use the buckle or clasp from your old strap, or the one that came with your watch, you will need to check that this size corresponds to the width of your buckle or clasp, measured along the spring bar from the inside of one side to the inside of the other, as shown in the picture below:

Width of Buckle

Thickness of Strap: This measurement is mostly irrelevant and it depends on the style of the watch and personal taste, as to what thickness is best for you. It becomes very important if you want to attach a clasp, eg. butterfly clasp, security clasp, flip clasp etc. to your watch strap.  Clasps tend to be suitable for watch straps up to a width of 3.5 or 4.0mm.  Sometimes the watch strap will be padded at the lug end but relatively flat where the holes are.  If this is the case, have a measure of the strap and if you’re using one of the middle holes, then you should be fine.  Once again, if in doubt, please contact us.

Thickness of Watch Strap

That’s all for now. If you have any questions, please email us!

Rob from Watchbandcenter

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