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Use our Partial Pressure Calculator to find gas pressure with mole fraction, Dalton’s law, or the ideal gas law. Get fast, clear results.
| Formula | Method |
|---|---|
| P_A = X_A × P_total | Mole fraction method (X_A = n_A/n_total) |
| P_unknown = P_total − ΣP_known | Dalton's law of partial pressures |
| P = nRT/V | Ideal gas law |
Need to find the pressure of a gas in a mix? Our Partial Pressure Calculator makes it easy. Enter your values and get a clear result in seconds. You can use it for oxygen, CO2, hydrogen, and other gases.
Partial pressure is the share of total pressure caused by one gas. Think of a gas mix like a team. Each gas adds its own share to the total pressure. This tool helps you find that share with less effort.
The main formula comes from Dalton’s law. It works for ideal gases and many common gas mixes.
Partial pressure formula:
Partial pressure = Mole fraction × Total pressure
In symbols:
P(A) = X(A) × P(total)
To find the mole fraction, use:
X(A) = Moles of gas A ÷ Total moles of all gases
For example, if oxygen makes up 40% of a gas mix, its mole fraction is 0.40. If total pressure is 10 atm, oxygen’s partial pressure is 4 atm.
You can also use the ideal gas law when you know the gas amount, volume, and temperature.
P = n × R × T ÷ V
Here, n means moles, R is the gas constant, T is temperature in kelvin, and V is volume.
Follow these five steps to find your result.
Choose a method: Select mole fraction, Dalton’s law, or the ideal gas law.
Enter your values: Add the total pressure, gas amount, or other values the form asks for.
Pick your units: Choose atm, kPa, Pa, bar, mmHg, or psi, as needed.
Click Calculate: Let the tool apply the right formula to your data.
Check your result: Review the answer, formula, and steps shown on the screen.
The calculator saves time and helps reduce simple math errors. Always check your units before you start.
Suppose a gas mix has 2 moles of oxygen and 3 moles of nitrogen. The total pressure is 10 atm. How do you calculate the partial pressure of oxygen?
Step 1: Find the total moles.
Total moles = 2 + 3 = 5 mol
Step 2: Find the oxygen mole fraction.
Mole fraction = 2 ÷ 5 = 0.40
Step 3: Apply the formula.
Oxygen pressure = 0.40 × 10 atm
Final answer: 4 atm
So, oxygen has a partial pressure of 4 atm in this mix.
The same basic idea helps you calculate the partial pressure of CO2 or H2. You just need the right gas data.
Our Partial Pressure Calculator makes gas pressure calculations quick and clear. Use it for physics, chemistry, and basic gas law problems. It supports key methods and common pressure units. For diving or medical use, check the right safety limits and expert guidance. Never rely on a calculator alone for a safety-critical choice.
Multiply the gas’s mole fraction by the total pressure. For example, 0.25 × 8 atm gives 2 atm.
The main formula is P(A) = X(A) × P(total). Here, X(A) is the gas’s mole fraction.
Find the CO2 mole fraction, then multiply it by the total pressure. For blood gas tests, use the measured CO2 pressure and the correct clinical context.
It’s the share of total pressure made by one gas. Each gas in a mix adds to the total.
Yes, if the tool offers those units. Choose psi, Pa, or kPa, then enter the matching values.
Yes. Divers use partial pressure to assess the gases they breathe at depth. Since pressure rises with depth, gas safety limits matter. Use trained guidance and approved dive tools.
Use the gas’s mole fraction and total pressure. For oxygen, use its share of the mix. For H2, use the hydrogen mole fraction and the same formula.