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    Size Converter

    Instantly convert watch measurements between millimeters and inches.

    mminches
    mm

    Common Case Size Values

    Quick Reference

    mm inches Common Use
    18mm 0.71″ Lug width — dress watches
    20mm 0.79″ Lug width — most popular
    22mm 0.87″ Lug width — divers & field
    36mm 1.42″ Case size — classic/vintage
    40mm 1.57″ Case size — modern standard
    42mm 1.65″ Case size — sport watches