Compare any two watches at true scale.
The free watch comparison tool that shows size, specs, and dimensions side-by-side at actual physical scale. Try on any watch with our wrist simulator.
Why Watch Sizing Matters
Spec sheets list case diameter, but that single number does not tell you how a watch actually fits. Two watches with the same 40mm dial can look and feel completely different on your wrist depending on their lug-to-lug distance, case thickness, and weight. A short-lugged dress watch hugs the wrist, while a long-lugged diver with the same case size can overhang and feel enormous.
WatchSize.io solves this by rendering every watch at true physical scale, calibrated to actual lug-to-lug measurements. When you compare two watches here, the size difference you see on screen is the real size difference. No misleading product photos, no guesswork. Just accurate proportions, full specs, and a wrist simulator that shows exactly how any watch fits on a wrist your size.
How It Works
Select Two Watches
Choose any two watches from our catalog of 120+ models across 30+ luxury brands. Search by brand or model name.
Compare at True Scale
See both watches rendered side-by-side at actual physical proportions. Toggle between side-by-side and overlay views.
Review Full Specs
Compare dimensions, movement details, materials, water resistance, weight, and pricing in a detailed specs table.
Try On Your Wrist
Enter your wrist width in our simulator to preview exactly how each watch fits, with color-coded fit zones.
Compare Watches by Brand
Browse 120+ luxury watches with full specs, case dimensions, and side-by-side comparisons. Find the perfect size for your wrist.
Popular Watch Comparisons
See how the most popular luxury watches stack up against each other in size, specs, and dimensions.
Rolex Submariner vs GMT-Master II
Compare the no-date Submariner against the iconic Pepsi GMT-Master II — two of Rolex's most popular sport watches.
Rolex Pepsi vs Batman
Same case, different bezels. See how the blue-red Pepsi and blue-black Batman GMT-Master II compare in every dimension.
Rolex Submariner vs Omega Seamaster
The classic rivalry: Rolex's Submariner Date vs Omega's Seamaster 300M, compared at true scale.
Rolex Daytona vs Omega Speedmaster
Two legendary chronographs head-to-head. Compare the Daytona and Moonwatch in size, thickness, and specs.
Rolex Datejust 36 vs 41
Is the 5mm difference between the 36mm and 41mm Datejust worth it? See the actual size difference at scale.
Rolex Explorer vs Explorer II
The 36mm Explorer versus the 42mm Explorer II — a significant size gap with different wrist presence.
Omega Speedmaster vs Seamaster
Omega's two most iconic lines compared: the Moonwatch chronograph against the Seamaster 300M diver.
Cartier Santos vs Tank
Two Cartier icons with very different silhouettes. Compare the square Santos against the rectangular Tank.
Tudor Black Bay 58 vs Pelagos
Tudor's heritage diver versus its modern titanium tool watch. See how they differ in size and weight.
Rolex Submariner No-Date vs Date
The Submariner with and without a date window. Same case diameter, but slightly different thickness and weight.
AP Royal Oak vs Offshore
The 41mm Royal Oak versus the 42mm Offshore — similar diameter but vastly different wrist presence.
Patek Philippe Aquanaut vs Nautilus
Two Patek sport watches compared. The Aquanaut and Nautilus share DNA but wear quite differently.
New to Watch Sizing?
Understanding case diameter, lug-to-lug distance, and thickness is the key to finding a watch that fits. Our sizing guide covers everything you need to know, from measuring your wrist to avoiding common sizing mistakes.
Read the Watch Sizing Guide