Watch strap sizing guide
Find the right strap length for your wrist and your watch.
A balanced fit depends on both your wrist circumference and your watch's lug-to-lug measurement.
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Every recommendation is based on classic watch fit principles.
Long End and Short End measurements exclude the watch case and buckle hardware.
Handcrafted strap dimensions may vary slightly within CERNIR's production tolerance.
Understand your strap size
Understand Your Strap Size
105 / 65 mmLong End 105 mm / Short End 65 mm
105 mm · Long End (Adjustment Holes)••••••••
65 mm · Short End (Buckle Side)
Long End — the side with the adjustment holes.
Short End — the side attached to the buckle.
Long End — influences the amount of tail after fastening.
Short End — influences where the buckle sits underneath the wrist.
Measurements — exclude the buckle hardware and watch case.
CERNIR Standard Strap Sizes
M
115 / 75 mmTotal 190 mmL
125 / 85 mmTotal 210 mmⓘ These are finished strap dimensions, not wrist ranges. Use the calculator because your watch's lug-to-lug measurement also affects the recommendation.
Fit check
What a Well-Fitted Strap Looks Like
⌚
GOOD FIT
✓ Buckle sits near the centre of the underside of the wrist
✓ Pin uses one of the middle adjustment holes
✓ Tail passes through both keepers neatly
⌚
STRAP TOO SHORT
● One of the final adjustment holes is required
● Tail barely reaches or cannot reach the keepers
● Buckle is pulled away from the centre
⌚
STRAP TOO LONG
● One of the first adjustment holes is required
● Tail extends far beyond the second keeper
● Buckle sits away from the centre
Special cases
Chronographs
Bulky casebacks wear best with a slightly longer strap.
Curved Lugs
Curved lugs can reduce the effective lug-to-lug. Follow the measurement guide.
In-Between Sizes
If you're between sizes, size up for comfort or down for a firmer fit.
Frequently asked questions
How do I measure my wrist correctly?
Wrap a flexible tape snugly around the wrist bone where you normally wear your watch. Do not include your hand.
Where do I measure lug-to-lug?
Measure in a straight line from the outer tip of one lug to the outer tip of the opposite lug.
What if my measurement is between two sizes?
Choose the calculator recommendation. It accounts for both the wrist and the watch case length.
Will the leather stretch over time?
Leather softens and shapes to the wrist, but the finished strap length changes only minimally.
What if the strap doesn't fit?
Contact CERNIR with your wrist and lug-to-lug measurements so the team can review the fit.