A chronograph is a watch’s elapsed-time stopwatch function; a tachymeter is a scale that converts a timed interval into a rate, commonly average speed over a known distance. They are different features that can work together: the chronograph measures the time, and the tachymeter helps interpret it.
What each term means
Chronograph: the timer
A chronograph lets you start, stop and read elapsed time, typically using pushers and a seconds hand separate from the watch’s ordinary time display. It measures an interval; by itself, it does not convert that interval into speed. Hamilton’s chronograph guide explains the timing function and notes that many chronographs also have a tachymeter.
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Tachymeter: the scale
A tachymeter is a graduated scale, usually printed around the dial or on the bezel. Used with a chronograph, it converts the time taken to cover a known distance into an approximate hourly rate. TAG Heuer describes the scale and the start-and-stop procedure in its tachymeter guide.
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How they work together to measure average speed
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Choose a known distance, such as one kilometer or one mile.
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Start the chronograph at the beginning of that distance.
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Stop it when you reach the end.
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Read the tachymeter value indicated by the chronograph seconds hand. For a one-kilometer measurement, the reading represents approximate kilometers per hour; for one mile, it represents approximate miles per hour.
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Casio’s official example uses a one-kilometer course: if it takes 30 seconds, the tachymeter indicates 120, or about 120 km/h. This is average speed across the measured section, not a continuous speedometer reading.
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At a glance
| Feature | Chronograph | Tachymeter |
|---|---|---|
| What it is | A watch timer for measuring elapsed time. | A graduated scale on the dial or bezel. |
| What it does | Times an interval. | Interprets a timed interval as a rate, commonly speed over a known distance. |
| What it needs | An event or interval to time. | A timed event and known distance for the common speed calculation; it relies on a timing function. |
| Typical result | Elapsed time. | An approximate hourly rate, such as km/h or mph. |
| Availability | May be present with or without a tachymeter scale. | Not included on every chronograph. |
Check the scale and its limits
Look for tachymeter markings on the dial or bezel, then consult the manual for the exact watch. Instructions can vary by model. Hamilton’s manual 1011 describes a procedure for measurements no longer than 60 seconds. TAG Heuer’s Calibre 16 guide specifies applicability to speeds above 60 km/h or mph. These are model-specific instructions, not universal limits for all tachymeter watches.
For further examples, Seiko’s tachymeter instructions cover determining seconds per kilometer as well as timing a job. Baume & Mercier’s glossary likewise describes the scale in relation to average speed over 1,000 meters.
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What to look for when choosing a watch
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If you want to time events, focus on the chronograph function and its controls.
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If you also want to read a tachymeter, check that the exact model has the scale and that its manual explains the range and procedure.
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