What Is a Chronograph Watch?
A chronograph is a watch with a built-in stopwatch. Alongside the normal time of day, it has pushers on the case that start, stop and reset a separate timing hand, usually with small subdials on the face that count elapsed minutes and hours. The name comes from Greek roots meaning time and writing. It is not the same thing as a chronometer, which is a watch that has passed an accuracy test and has no stopwatch function by itself. A watch can be both, either, or neither. The rest of this guide explains how to use the pushers and subdials, what the tachymeter scale is for, what a flyback is, how chronograph movements differ, and which famous models are worth knowing, including what to look for if you are buying one.
What a chronograph does
A regular watch shows the time. A chronograph also lets you time an event: a cooking step, a lap, a parking meter, a flight leg, a drive between two points. The timing is separate from the time of day, so the watch keeps showing the correct time while the stopwatch runs.
Most chronographs share the same basic layout. A large central hand, called the chronograph seconds hand, sweeps around the dial when the function is running. Small subdials, usually two or three, count the minutes and sometimes the hours. A separate subdial, often at 9 o'clock on many layouts, shows the running seconds of the ordinary time of day.
How to use the pushers
Look at the side of the case. Most chronographs have a crown, a pusher above it and a pusher below it. The exact positions are conventions and not laws, but the standard operation is the same.
- The upper pusher, near 2 o'clock, starts the chronograph. Press it once and the central seconds hand begins to run.
- Press the same upper pusher again to stop it. The hands freeze so you can read the elapsed time.
- The lower pusher, near 4 o'clock, resets the hands to zero. Only press it when the chronograph is stopped, because on most watches it will not work while the timer is running.
- To resume timing from where you stopped, press the upper pusher again before you reset. The watch adds the new period to the old one, which is how you time something with pauses.
Some watches use a single pusher for all three actions. These are often called monopusher chronographs, and the sequence is start, stop, reset with the same button.
Reading the subdials
After you stop the chronograph, read the elapsed time in this order. First, the minute subdial: if its hand is between 12 and 13, a bit under or over, that is about 12 minutes. Second, the hour subdial, if the watch has one, typically a 12 hour counter. Third, the central seconds hand, which gives the seconds within the current minute.
Many watches have a 30 minute counter and a 12 hour counter, but layouts vary. The two-subdial layout, often called a bi-compax layout, has one counter plus a running seconds dial. The three-subdial layout, called tri-compax, has the running seconds, a minute counter and an hour counter. Which one a watch has is part of its identity, and many collectors have a strong preference.
The tachymeter scale
Many chronographs carry a scale of numbers printed around the edge of the dial or on the bezel. This is a tachymeter, and it converts elapsed time into speed over a known distance.
To use it, start the chronograph as you pass a marker, such as the start of a measured mile or kilometer. Stop it when you reach the end of that distance. Read the number on the scale where the central seconds hand points. That number is your speed in miles or kilometers per hour, depending on which unit you used for the distance.
The scale works for one unit of distance only, and it generally covers events that take under a minute, because the seconds hand makes one revolution a minute. If the measurement takes longer, the scale cannot read it directly. The math behind it is simple: speed equals 3,600 divided by the seconds taken, for a distance of one unit. Today few people use a tachymeter to measure speed, and it has become a design feature of racing-inspired watches.
Chronograph versus chronometer
These two words look alike and mean different things, and mixing them up is one of the most common watch mistakes.
A chronograph is a function. It is a stopwatch built into the watch.
A chronometer is a quality rating for accuracy. The standard version is certified by an independent institute, in Switzerland usually COSC, which tests movements for several days at different temperatures and positions. For an automatic movement to qualify, its average daily rate must be within minus 4 to plus 6 seconds per day.
A watch can be a chronograph and a chronometer at the same time. A Rolex Daytona, for example, is a chronograph, and as a Rolex it is described by the brand as a Superlative Chronometer. A three-hand watch with no stopwatch can be a chronometer too. And many chronographs are not certified chronometers at all.
The flyback chronograph
A standard chronograph needs three actions to time a new interval after you have finished one: stop, reset, start. A flyback chronograph lets you press the reset pusher while the chronograph is still running. The hands fly back to zero and immediately start timing again, with no stop.
That matters for timing successive intervals without losing time between them, and it was developed for pilots who had to track legs of a flight. Longines received a patent for the flyback in 1936, which is reported as the first for a wristwatch of this type. Flybacks remain a mark of more sophisticated chronographs, and they are found in watches from several makers today.
Mechanical and quartz chronographs
Chronographs come in both major movement types, and the difference shapes the price and the experience.
A mechanical chronograph, whether hand-wound or automatic, uses a mechanism to start, stop and reset the timer. Many use a clutch to connect the timing hands to the movement, and some high-end designs use a column wheel to control the pushers, which gives a smoother action. Mechanical chronographs are more complicated than ordinary watches, which is why they usually cost more and need specialist servicing. Our guide "Automatic vs Quartz Watches: The Real Difference" covers the broader trade-offs between movement types.
A quartz chronograph uses a battery and a circuit and is usually more accurate, cheaper and simpler to maintain. Many quartz chronographs can time to a fraction of a second, and some can be more precise than any mechanical watch.
Within mechanical, there is a distinction between an integrated chronograph movement, designed from the start to include the stopwatch, and a modular one, where a chronograph module is added on top of a base movement. Integrated movements are generally considered more elegant, and modular ones can be easier and cheaper to service. Widely used automatic chronograph movements, such as the ETA Valjoux 7750, appear in watches from many brands.
A short history, in the right order
The chronograph has a long history, but a few moments stand out for buyers.
In 1936, Longines patented the flyback, as above.
In 1965, NASA qualified the Omega Speedmaster for use on manned space missions after a series of tests in extreme conditions. On July 21, 1969, Buzz Aldrin wore the Speedmaster Professional on the Moon during Apollo 11. Neil Armstrong's watch was left in the lunar module. The Speedmaster Professional, or Moonwatch, used a manual-wind movement, the caliber 861 and later 1861, beating at 21,600 beats per hour, and it remains in the catalog today. It is still reported as the only watch qualified by NASA for spacewalks.
In 1969, three groups raced to produce the first automatic chronograph. Zenith announced its El Primero on January 10, 1969, an integrated automatic chronograph running at 36,000 beats per hour, or 5 Hz, when 2.5 Hz was common. A consortium of Heuer, Breitling, Dubois Depraz and Hamilton-Buren produced the Calibre 11 Chrono-Matic, which reached the market by August 1969 and powered the Heuer Monaco. Seiko's 6139 launched in mid-May 1969, only in Japan. People still argue over who was first, since it depends on the definition: announced, sold, or sold widely.
Famous chronographs to know
These are the models you will see most often in discussions and auctions.
The Omega Speedmaster Professional, the Moonwatch, for its NASA history and its manual-wind movement.
The Rolex Daytona, a chronograph from the brand best known for its Submariner, and a long-running object of collector demand. If you are interested in how Rolex pricing behaves, our guide "Rolex Submariner Prices: What They Actually Sell For" shows how to read completed sales, and the same approach works for any reference.
The Zenith El Primero, for the high-frequency movement that started in 1969.
The Heuer Monaco, known for its square case and the Calibre 11 movement.
The Breitling Navitimer, which carries a slide rule bezel in addition to the chronograph. Aviators used the slide rule to calculate climbing speeds, fuel consumption and flight times, long before digital instruments.
What to look for when buying a chronograph
Test every function. Start, stop and reset should be crisp, and the hands should return exactly to zero. If the central seconds hand does not line up with 12 when reset, the watch may need adjustment.
Check that the pushers move smoothly and that the chronograph hand does not jump or lag when it starts. A hesitation can mean wear.
Look at the subdials. Hands should sit at zero and move cleanly. Mismatched or replaced hands can reduce value on a collectible watch.
Ask about service history. A chronograph has more parts than a three-hand watch, so servicing costs more and a missed service can be expensive. Ask for papers and records.
Know the reference. As with any luxury watch, the exact reference number, the originality of dial, hands and bezel, and the presence of box and papers can matter more than the label. Our guides "Watch and Rolex Appraisal Explained" and "What Drives the Resale Value of a Luxury Watch" explain what buyers pay for.
Verify authenticity. Chronographs are a favorite of counterfeiters because the subdials and pushers are easy to fake to a casual eye. Our guide "How to Authenticate a Luxury Watch Before You Bid" covers what to check, and "Rolex Serial Numbers: How to Look One Up" explains the numbers on a Rolex.
Seeing a chronograph work before you bid
With a chronograph, the function is part of the purchase, and it is easy to confirm on camera. On a live auction you can ask the seller to start, stop and reset the timer, turn the watch to show the pushers and the case sides, and read the reference. Ziv Tamir of Rocks On Clocks LLC in Miami, known on Instagram as "Ziv the Watch Guy," goes live on ShopBidz selling Rolex and luxury watches, and NYC Watches & Diamonds (NYC Watches LLC), a New York seller on ShopBidz, offers luxury watches, jewelry and bags. Both are sellers you can watch live if you want to see a watch in operation and ask your questions before bidding. Treat anything you see on camera as a start, and complete the authentication steps before paying. ShopBidz's luxury watch auctions with NYC Watches have also featured Uncle Manny.
Bottom line
A chronograph is a watch with a stopwatch: the upper pusher starts and stops it, the lower pusher resets it, and subdials count the minutes and hours while a central hand counts seconds. It is not a chronometer, which is an accuracy certification, though a watch can be both. A tachymeter scale turns elapsed time over a measured distance into speed, a flyback lets you reset and restart in one press, and movements range from mechanical, integrated or modular, to quartz. The Speedmaster, Daytona, El Primero, Monaco and Navitimer are the names to know. Before buying, test every function, check the subdials and pushers, ask about service, and verify authenticity.