What is the Ideal Gas Law Calculator?
Solve PV = nRT for pressure given moles, temperature and volume. These physics and science calculators apply standard SI formulas with exact constants (such as g = 9.80665 m/s² and the 2019 SI definitions) for students, engineers and curious minds.
How to use the Ideal Gas Law Calculator
- Enter your amount, your temperature, your volume.
- Results update automatically as you type; you can also press Calculate.
- Read the output: pressure, in atm.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With amount = 1 mol, temperature = 298.15 K, volume = 22.4 L, the Ideal Gas Law Calculator returns pressure: 110,667.72 Pa; in atm: 1.09221 atm.
Tips for better results
- Convert inputs into SI units first for the cleanest results.
- Idealized formulas ignore friction and air resistance unless stated.
- Use our unit converters to switch between metric and imperial results.
Frequently asked questions
What does the Ideal Gas Law Calculator do?
Solve PV = nRT for pressure given moles, temperature and volume.
How is it calculated?
The Ideal Gas Law Calculator uses this method: P = nRT ÷ V, R = 8.314462618 J/(mol·K).
Can you show an example?
With amount = 1 mol, temperature = 298.15 K, volume = 22.4 L, the Ideal Gas Law Calculator returns pressure: 110,667.72 Pa; in atm: 1.09221 atm.
Is the Ideal Gas Law Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Ideal Gas Law Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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