Partial Pressure Calculator
Choose a calculation mode and provide component values. Use a consistent pressure unit.
A QUICK WALKTHROUGH
How to use this tool
- Choose a calculation mode and provide component values. Use a consistent pressure unit.
- For a mixture, Pi = yi · Ptotal and Σyi = 1. In reverse mode, Ptotal = ΣPi and yi = Pi/Ptotal. Values must be nonnegative; total pressure must be positive to compute fractions. This uses Dalton’s law for an ideal-gas mixture only; it excludes humidity and real-gas corrections.
- Calculate
Formula and scope
For a mixture, Pi = yi · Ptotal and Σyi = 1. In reverse mode, Ptotal = ΣPi and yi = Pi/Ptotal. Values must be nonnegative; total pressure must be positive to compute fractions. This uses Dalton’s law for an ideal-gas mixture only; it excludes humidity and real-gas corrections.
Inputs stay in this browser.
Inputs stay in this browser.
GOOD TO KNOW
Common questions
How is the result calculated?
For a mixture, Pi = yi · Ptotal and Σyi = 1. In reverse mode, Ptotal = ΣPi and yi = Pi/Ptotal. Values must be nonnegative; total pressure must be positive to compute fractions. This uses Dalton’s law for an ideal-gas mixture only; it excludes humidity and real-gas corrections.