Dalton's Law Partial Pressure Calculator

Calculates a gas partial pressure from barometric pressure and gas fraction.

Inputs

Color mode links each input to the matching equation term and solving arithmetic.

Equation and Work

Equation:
Solving steps:
Partial pressure
—
mmHg
Fraction
—
decimal
Context
—
dry gas

Clinical Significance

Dalton’s law states that the total pressure of a gas mixture equals the sum of the partial pressures of its component gases.

In respiratory care, partial pressure is commonly estimated as gas fraction multiplied by barometric pressure for dry gases.

This dry-gas calculator does not subtract water vapor pressure unless you manually adjust the pressure input.

References (APA 7th Edition)

  1. Chang, D. W. (2020). Respiratory Care Calculations (Revised 4th ed.). Jones & Bartlett Learning. Formula content adapted from the uploaded text/reference packet.