Chemistry calculator
Ideal Gas Law Calculator
Solve ideal gas pressure from moles, temperature, and volume.
FormulaPV = nRT; P = nRT / V
Formula
Ideal gas law
This is an ideal gas estimate and may differ from real gases at high pressure, low temperature, or non-ideal conditions.
PV = nRT; P = nRT / V
1 mol at 298.15 K in 24.5 L is close to 1 atm.
FAQ6 common questions for this calculator.
FAQs
What gas constant is used?+
The calculator uses R = 8.314462618 kPa L/(mol K).
What ideal-gas-law units should I enter?+
Use moles, kelvin, and liters to get pressure in kPa.
How does the Ideal Gas Law Calculator calculate the result?+
For the Ideal Gas Law Calculator, it uses the Ideal gas law: PV = nRT; P = nRT / V. 1 mol at 298.15 K in 24.5 L is close to 1 atm.
What information do I need to use the Ideal Gas Law Calculator?+
For the Ideal Gas Law Calculator, enter moles, temperature, and volume. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.
How accurate is the Ideal Gas Law Calculator?+
The ideal gas estimate is accurate only when the gas behaves close to the ideal model. High pressure, low temperature, humid mixtures, and non-ideal gases can make real pressure differ from PV = nRT.
What should I check before using the Ideal Gas Law Calculator result?+
Check pressure, volume, moles, and temperature units before applying PV = nRT. Use kelvin for temperature and avoid relying on the ideal model where real-gas behavior is important.
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How to use the Ideal Gas Law Calculator
Solve ideal gas pressure from moles, temperature, and volume. The page also explains the ideal gas law and shows a practical example: 1 mol at 298.15 K in 24.5 L is close to 1 atm.
- 1
Enter your details
Enter moles, temperature, and volume, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the ideal gas law: PV = nRT; P = nRT / V.
- 3
Compare scenarios
Change one or more inputs to see how they affect the ideal Gas Law Calculator result before you use the estimate.