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

Depth Meters (m)

Required number input.

Density Kg Per Cubic Meter (kg/m3)

Required number input.

Gravity Meters Per Second Squared (m/s2)

Required number input.

Water gauge pressure in pascals from depth, fluid density and gravitational acceleration. 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]

Gauge Pascals (Pa)

The resulting gauge pascals 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.

• Meters To Atm

  Gauge pressure in standard atmospheres from freshwater depth, density and gravity; not a watch depth rating.

• Atm To Meters

  Freshwater hydrostatic depth equivalent of a gauge-pressure rating in standard atmospheres; not a safe diving depth.

• Dynamic Pressure Factor

  Dynamic pressure ½ρv² in pascals for incompressible flow at specified density and speed.