Watch Band Width Calculator
Find the right strap using lug width, case ratio, or brand/model matching with smart style recommendations.
Calculator Inputs
Most common: 18mm, 20mm, 22mm, 24mm
Lug Width Diagram
Interactive Width Preview
16mm20mm26mm
Visual difference demo: thinner (18mm) vs standard (20mm) vs bold (22mm+)
Popular Sizes Chart
| Watch Case | Band Width | Notes |
|---|---|---|
| 36mm | 18mm | Rule of thumb: case ÷ 2 |
| 38mm | 19mm | Rule of thumb: case ÷ 2 |
| 40mm | 20mm | Rule of thumb: case ÷ 2 |
| 42mm | 21mm | Rule of thumb: case ÷ 2 |
| 44mm | 22mm | Rule of thumb: case ÷ 2 |
| 46mm | 23mm | Rule of thumb: case ÷ 2 |
| 48mm | 24mm | Rule of thumb: case ÷ 2 |
Brand Compatibility Database
| Brand | Model | Band Width | Compatibility |
|---|---|---|---|
| Rolex | Submariner Date | 20mm | Standard spring-bar compatibility |
| Rolex | GMT-Master II | 20mm | Standard spring-bar compatibility |
| Rolex | Datejust 41 | 21mm | Standard spring-bar compatibility |
| Rolex | Explorer 36 | 19mm | Standard spring-bar compatibility |
| Omega | Seamaster Diver 300M | 20mm | Standard spring-bar compatibility |
| Omega | Speedmaster Professional | 20mm | Standard spring-bar compatibility |
| Omega | Aqua Terra 41 | 20mm | Standard spring-bar compatibility |
| Seiko | SKX007 | 22mm | Standard spring-bar compatibility |
| Seiko | Prospex Turtle | 22mm | Standard spring-bar compatibility |
| Seiko | Alpinist SPB121 | 20mm | Standard spring-bar compatibility |
| Casio | G-Shock GA-2100 | 16mm | Standard spring-bar compatibility |
| Casio | Duro MDV106 | 22mm | Standard spring-bar compatibility |
| Apple | Apple Watch 38/40/41 | Proprietary | Proprietary connector (adapter required). |
| Apple | Apple Watch 42/44/45/49 | Proprietary | Proprietary connector (adapter required). |
Quick Presets By Wrist Size
Small wrist
18–20mm
Medium wrist
20–22mm
Large wrist
22–24mm
FAQs
Can I use a 22mm strap on a 20mm lug watch?
Not reliably. Strap width should match lug width unless the watch uses adapters.
Why choose tapered bands?
They reduce bulk toward the buckle and usually wear more comfortably with a premium look.
What if my model is proprietary?
You may need OEM connectors or adapter lugs before fitting standard straps.