MAXScanner physics & engineering calculator
Ideal Gas Law Calculator — Solve P, V, n or T with Unit Conversion
Enter any three ideal-gas variables and solve the fourth. Pressure, volume and temperature unit choices are converted to SI internally before PV=nRT is applied.
Last updated: September 17, 2026
Results
Leave exactly one of P, V, n or T blank
Formula, example and assumptions
PV=nRT, R=8.314462618 J/(mol·K).
At 1 atm and 273.15 K, one ideal mole occupies about 22.414 L under the 1-atm STP convention.
- The ideal-gas model is most reliable away from high-pressure and near-condensation conditions.
- Absolute temperature must be positive; Celsius and Fahrenheit are converted to kelvins before solving.
Frequently asked questions
Can I leave any variable blank?
Yes. Leave exactly one of P, V, n or T blank and the calculator solves that variable.
Why is Kelvin required?
Gas-law proportionality uses absolute temperature. The interface can accept other temperature units but converts them to kelvins internally.