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

Axial Travel Millimeters (mm)

Required number input.

Thread Pitch Millimeters Per Turn (mm/turn)

Required number input.

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

Turns (turn)

The resulting turns 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.

• Rotor Wind Rate

  Effective barrel turns per hour from rotor revolutions per hour and rotor revolutions required per barrel turn.

• Telemeter Distance

  Sound travel distance in kilometres from time between a visible event and its audible arrival.

• Crown Turns Full Wind

  Crown turns to fully wind a mainspring from usable barrel turns and crown turns per barrel turn.