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Science

Ideal Gas Law Calculator

Solve pressure, volume, temperature or moles with PV=nRT.

Enter your values

Enter the moles in mol.

Enter the temperature in K.

Enter the volume in L.

Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.

Results
Pressure
0.9993 atm
Pressure
101.25 kPa
Pressure
14.69 psi

Quick answer

PV = nRT, with R = 0.0821 L·atm/(mol·K).

PV = nRT

At a glance

What it doesSolve pressure, volume, temperature or moles with PV=nRT.
CategoryScience
Inputs neededMoles, Temperature, Volume
Main outputPressure
FormulaPV = nRT
CostFree — no sign-up, no download

How to use the Ideal Gas Law Calculator

  1. 1Enter the number of moles of gas.
  2. 2Enter the absolute temperature in Kelvin (add 273.15 to Celsius).
  3. 3Enter the volume the gas occupies to find its pressure.

Inputs explained

Moles(mol)
Enter the moles in mol.
Temperature(K)
Enter the temperature in K.
Volume(L)
Enter the volume in L.

Worked example

Using the values the calculator loads with:

Inputs

  • Moles1 mol
  • Temperature298 K
  • Volume24.47 L

Results

  • Pressure0.9993 atm
  • Pressure101.25 kPa
  • Pressure14.69 psi

Frequently asked questions

What are STP conditions?

Standard temperature and pressure is commonly 0°C (273.15K) and 1 atm, where one mole occupies 22.4 L.

Does this work for real gases?

The ideal gas law is a good approximation for most gases at moderate pressure and temperature.

What do I need to enter into the Ideal Gas Law Calculator?

Just 3 values: moles, temperature, volume. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.

How does the Ideal Gas Law Calculator work out the answer?

PV = nRT, with R = 0.0821 L·atm/(mol·K). It applies the formula PV = nRT and shows the working so you can check each step by hand.

Is the Ideal Gas Law Calculator free, and do I need an account?

It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.

Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.