Chronograph Watches Explained: Subdials & Tachymeters (2026)
Chronograph watches explained: what the subdials and pushers actually do.
Last updated: August 2026
A chronograph is a watch with a built-in stopwatch: the pushers start, stop and reset it, and the subdials track elapsed seconds, minutes and hours. Beyond function, those subdials give a dial depth and instrument character no plain three-hander can match, which is why the chronograph remains the most popular complication in watchmaking.
In this article
How a chronograph works
The top pusher starts and stops the stopwatch; the bottom pusher resets it. The central seconds hand usually belongs to the stopwatch, while the small subdials show running seconds and elapsed minutes. Day to day you will use it for parking meters, steeping tea and boiling eggs more than lap times, and that is exactly the charm: a tool watch you actually use.
What the tachymeter does
The numbered scale around many chronograph bezels converts elapsed time into speed: start the chrono at one mile marker, stop at the next, and the hand points to your average speed on the scale. Mostly, though, the tachymeter earns its place visually, it is the detail that gives racing chronographs their instrument-panel look.
The picks
Full steel build with the classic three-subdial layout.
Refined proportions that carry the complication into the office.
The racing-bezel look under $40, new to the store.
Frequently asked questions
What is a chronograph watch?
A watch with an integrated stopwatch, operated by pushers, with subdials tracking elapsed time.
What are the three small dials on a watch?
Typically running seconds, elapsed stopwatch minutes, and elapsed stopwatch hours.
Does a chronograph drain the battery?
Running the stopwatch constantly does draw more power on quartz models, use it as needed and battery life stays normal.
Chronograph or plain dial?
Chronograph for presence and utility; a clean three-hander for pure dress. See which watch by occasion.
Are chronographs formal?
Slimmer, dial-restrained chronographs pair fine with tailoring; save heavy sport chronos for casual wear.
More watches: types of men's watches and quartz vs automatic.
Instrument on the wrist
Chronographs and tachymeters from $39.98.
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