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Chemistry

Partial Pressure Calculator

Calculate a component gas pressure from its mole amount and the total mixture pressure.

Explicit units and model assumptionsLocal calculations with worked examples
Chemistry workspace
Chemistry workspace

Check the units, concentration basis and assumptions before interpreting the result.

See the method

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Your chemistry result

Your result

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Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter component amount, total mixture amount, total absolute pressure.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

For an ideal mixture, partial pressure = component mole fraction × total pressure.

A WORKED EXAMPLE

Using component amount = 2 mol, total mixture amount = 10 mol, total absolute pressure = 100 kPa, the result is 20 kPa. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

Yes, under the ideal-mixture model, the component mole fractions sum to one and their partial pressures sum to total pressure.

What to keep in mind

Dalton’s law assumes ideal, nonreacting gases. Total moles include the selected component. Educational calculation only; use validated procedures for laboratory work.

Reference: OpenStax Chemistry 2e — chemical quantities and models

Common questions

Do partial pressures add up to total pressure?

Yes, under the ideal-mixture model, the component mole fractions sum to one and their partial pressures sum to total pressure.

Are my inputs uploaded?

No. This calculation runs in your browser without an account or an external API.

Methodology maintained by ClarityKit. How these tools are built and checked.