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Lug Width Calculator

Find the correct watch strap size in seconds. Measure your watch's lug width, estimate strap size from watch diameter, or look up common lug widths used by popular watch brands.

Lug Width Calculator

Measure the distance between the inside edges of your watch lugs in millimetres.

Enter Lug Width (mm)

Find Strap Size

Common Lug Widths

Lug Width	Typical Watches
16 mm	Small vintage and dress watches
18 mm	Dress watches
20 mm	Most modern watches
22 mm	Dive and sports watches
24 mm	Large pilot and oversized watches

Brand & Model Lug Width Finder

Select your watch brand and model to instantly find the correct lug width.

Brand Select Brand Rolex Omega Seiko Citizen Casio Tissot Longines Tudor Hamilton Orient Bulova Timex

Model Select Brand First

Find Lug Width

Common Lug Width Reference

Lug Width	Common Watch Size	Typical Watches
18 mm	34–38 mm	Vintage, Dress
19 mm	37–39 mm	Dress, Field
20 mm	38–42 mm	Most Sports Watches
21 mm	40–42 mm	Modern Luxury Watches
22 mm	42–46 mm	Divers, Pilot Watches
24 mm	45 mm+	Oversized Watches

How to Measure Lug Width

1. Remove the strap if installed.
2. Measure the inside distance between the two lugs.
3. Use a digital caliper for maximum accuracy.
4. If using a ruler, measure in millimetres.
5. Choose a strap matching the measured width.

Frequently Asked Questions

Can I use a 20 mm strap on a 21 mm watch?

No. Always use the exact lug width whenever possible.

Does case size determine lug width?

No. Watches with the same case diameter can have different lug widths.

Which strap material is best?

Leather, rubber, NATO, canvas and steel bracelets all work if the width matches.

Can I replace metal bracelets with leather straps?

Yes, provided the lug width is identical.

Are integrated bracelets different?

Yes. Integrated bracelets usually require manufacturer-specific replacements.

Watch Strap Size Conversion Chart

Lug Width	Inches	Common Use
18 mm	0.71"	Vintage & Dress
19 mm	0.75"	Dress Watches
20 mm	0.79"	Sports Watches
21 mm	0.83"	Luxury Sports
22 mm	0.87"	Divers & Pilot
23 mm	0.91"	Large Watches
24 mm	0.94"	Oversized Watches

How to Replace a Watch Strap

1. Place the watch on a soft cloth.
2. Compress the spring bar with a spring-bar tool.
3. Remove the old strap carefully.
4. Insert the new strap.
5. Ensure both spring bars click securely into place.
6. Pull gently to confirm the strap is locked.

Common Strap Problems

Problem	Cause	Solution
Strap won't fit	Wrong lug width	Measure again
Loose strap	Incorrect spring bars	Replace spring bars
Gap between case & strap	Wrong end shape	Use curved-end strap
Pin keeps coming out	Worn spring bar	Install new spring bars
Leather cracking	Water damage	Replace leather strap
Bracelet rattles	Loose links	Tighten or replace pins

Watch Strap Care Guide

• Keep leather straps dry.
• Wash rubber straps with mild soap.
• Rinse NATO straps after salt water.
• Clean steel bracelets using a soft brush.
• Store straps away from direct sunlight.
• Replace worn spring bars regularly.
• Avoid harsh chemicals.
• Rotate straps to extend lifespan.

Watch Terminology

Term	Meaning
Lug Width	Distance between the lugs
Spring Bar	Pin holding the strap
Case Diameter	Width of the watch case
Lug-to-Lug	Total length across the watch
End Link	Bracelet section joining the case
Buckle	Fastening mechanism
Deployant Clasp	Folding clasp
Integrated Bracelet	Bracelet designed only for that model

Lug Width by Watch Category

Category	Typical Lug Width
Dress Watches	18–20 mm
Dive Watches	20–22 mm
Pilot Watches	20–22 mm
Field Watches	18–20 mm
GMT Watches	20–22 mm
Chronographs	20–22 mm
Smartwatches	20–22 mm
Oversized Watches	22–24 mm

Why Lug Width Matters

The correct lug width keeps the watch secure, improves comfort, prevents excess movement, reduces spring bar wear, and ensures the strap looks proportionate to the case.

How to Measure Without a Caliper

1. Remove the existing strap.
2. Place a millimetre ruler between the lugs.
3. Measure the inside distance.
4. Round only if your measurement is clearly between markings.
5. Buy a strap matching the measured width.

Common Mistakes

• Using a strap narrower than the lug width.
• Confusing case size with lug width.
• Ignoring integrated bracelet designs.
• Reusing damaged spring bars.
• Buying based only on brand.
• Forcing oversized straps into the lugs.
• Measuring outside instead of inside the lugs.
• Ignoring buckle width compatibility.

Quick Strap Selector

Lug Width	Recommended Strap Length
18 mm	110/70 mm
19 mm	115/75 mm
20 mm	120/80 mm
21 mm	120/80 mm
22 mm	125/80 mm
24 mm	125/85 mm

More Frequently Asked Questions

Can lug width change between versions?

Yes. Different generations of the same watch may use different lug widths.

Can I install a metal bracelet instead of leather?

Yes, if it is designed for the same lug width and case.

Are spring bars universal?

No. They vary in length, diameter and shoulder design.

Is lug-to-lug the same as lug width?

No. Lug-to-lug measures the overall watch length, while lug width measures the distance between the lugs.

Do curved straps fit every watch?

No. Curved-end straps are designed for specific case shapes.

Which lug width is most common?

20 mm is one of the most common sizes for modern watches.

Watch Brands Covered

Brand	Models Included
Rolex	10
Omega	10
Seiko	10
Citizen	10
Casio	10
Tissot	10
Longines	10
Tudor	10
Hamilton	10
Orient	10
Bulova	10
Timex	10

Signs You Need a New Strap

• Cracked leather
• Loose spring bars
• Broken buckle
• Faded colour
• Bad odour
• Deep scratches
• Stretched holes
• Torn rubber
• Rust on metal bracelet
• Loose links

How Often Should You Replace a Watch Strap?

Material	Typical Life
Leather	1–3 Years
Rubber	2–5 Years
Silicone	2–4 Years
NATO Nylon	2–5 Years
Canvas	2–4 Years
Steel Bracelet	10+ Years
Titanium Bracelet	10+ Years

Watch Strap Buying Checklist

Correct lug width
Correct length
Correct material
Water resistance considered
Correct buckle size
Compatible spring bars
Colour matches watch
Comfortable for daily wear

Useful Tips

• Measure twice before ordering.
• Keep spare spring bars.
• Use quality spring-bar tools.
• Clean straps regularly.
• Rotate multiple straps.
• Store leather away from heat.
• Check spring bars every few months.
• Use genuine replacement bracelets for integrated designs.

Conclusion

The correct lug width ensures your replacement strap fits securely, looks proportional, and remains comfortable. Use the calculator above or browse the brand database to quickly find the right size before purchasing a new strap.

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