Use this horology calculation to interpret a stated watch, clock, timing-machine, water-resistance, alarm, or historical respiratory-timing quantity under its defined convention.

Delay Seconds (s)

Required number input.

Sound Speed Meters Per Second (m/s)

Required number input.

Sound travel distance in kilometres from time between a visible event and its audible arrival. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Distance Kilometers (km)

The resulting distance kilometers returned as a number.

• Mechanical-watch amplitude and beat measurements depend on lift angle, position, state of wind, movement condition, instrument setup, and elapsed sampling. ATM markings are test-pressure classifications rather than literal safe diving depths.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Confirm movement specifications and measure in multiple positions and power states; follow the manufacturer's water-resistance guidance and obtain pressure testing after case service.

• Caseback Turns Close

  Caseback turns required for a threaded axial travel distance at specified thread pitch.

• Tachymeter Speed

  Average speed in km/h from distance in kilometres and elapsed seconds.

• Alarm Set Offset

  Forward minutes from current clock time to an alarm time, wrapping at 24 hours.