Tools
Watch tools
Calculators that work from numbers you enter and the sourced catalogue. They run in your browser and on the server, so they work with JavaScript turned off.
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Wrist fit calculator
Enter your wrist circumference to get a rule-of-thumb case diameter range and maximum lug-to-lug length, plus catalogue references in that size range.
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Water resistance decoder
Convert 3 ATM, 100 m or 330 ft between units and see what the rating is commonly considered safe for, from splashes to diving.
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Case size comparison
Draw two case diameters to scale and see how much wider, and how much more dial, the bigger one really is.
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Beat rate converter
Convert a movement's frequency between vph, Hz and beats per second, and find catalogue calibers that run at that rate.
Looking for a shortlist instead? Browse the watch guides.