Ideal Gas Law Calculator
Solve PV = nRT for pressure, volume, moles, or temperature given the other three values.
Pressure (atm)
1.0006 atm
Uses the ideal gas constant R = 0.0820573 L·atm/(mol·K).
Enter any three of pressure, volume, moles, and temperature, and this calculator solves for the fourth using the ideal gas law PV = nRT. All math runs locally in your browser using the gas constant R = 0.0821 L·atm/(mol·K).
How to use
- Select which variable to solve for.
- Enter the three known values with their units.
- Read the calculated result below.
Frequently asked questions
- What units does this calculator use?
- Pressure in atmospheres (atm), volume in liters (L), amount in moles (mol), and temperature in Kelvin (K).
- What is R in the ideal gas law?
- R is the ideal gas constant, 0.0821 L·atm/(mol·K), used to relate the other four quantities.
- Do I need to convert Celsius to Kelvin first?
- Yes, temperature must be entered in Kelvin. Add 273.15 to a Celsius value to convert it.