Calculate any variable in the Ideal Gas Law (PV = nRT). Enter three known values to solve for the fourth.
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Enter Your Measurements
Results
Temperature
273.0
K
Temperature
-0.2
°C
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Formula
PV = nRT (R = 0.08206 L·atm/mol·K)
How to Use This Calculator
How to Use
- 1
Enter pressure in atmospheres.
- 2
Enter volume in liters.
- 3
Enter number of moles.
- 4
Get temperature in Kelvin and Celsius.
Frequently Asked Questions
Frequently Asked Questions
When does the ideal gas law apply?
It applies to gases at relatively low pressures and high temperatures. At extreme conditions, use the van der Waals equation for real gases.
What is STP?
Standard Temperature and Pressure: 0°C (273.15 K) and 1 atm. At STP, 1 mole of ideal gas occupies 22.4 liters.
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About This Calculator
This calculator uses the formula: PV = nRT (R = 0.08206 L·atm/mol·K). All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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