Millimeters of Mercury (mmHg) to Pascals (Pa) Converter

Pressure readings in laboratory settings often rely on the height of a mercury column, denoted as mmHg. However, the International System of Units (SI) mandates the use of Pascals (Pa) for thermodynamic calculations. This discrepancy creates a frequent friction point for researchers in vacuum physics, meteorology, and cardiovascular physiology.

Accuracy is non-negotiable here. A deviation of a few Pascals can alter the outcome of sensitive vacuum deposition processes or fluid dynamics simulations. This tool bridges the gap by applying the standard definition where 1 standard atmosphere is defined as exactly 101,325 Pa, corresponding to 760 mmHg. Consequently, the conversion factor is approximately 133.322 Pa per mmHg. Users working with Torr can typically use this same converter, as 1 Torr is virtually identical to 1 mmHg within one part in seven million.

The precise conversion relies on the definition of the standard atmosphere. The relationship is linear.

For batch calculations involving gauge pressure (pressure relative to ambient), ensure your input data is consistent before converting. Negative values in absolute pressure contexts are physically impossible and will trigger a warning.