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

Hertz (Hz)

Required number input.

Full oscillation period in seconds from positive cycle frequency in hertz. 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]

Period Seconds (s)

The resulting period seconds 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.

• Bph To Hertz

  Balance oscillation cycles per second from beats per hour, with two beats per full oscillation.

• Hertz To Bph

  Watch beats per hour from full balance oscillations per second, with two beats per cycle.

• Seconds Pendulum Length

  Small-angle pendulum length for a two-second full period (one-second half swing) at local gravity.