Science & Engineering
Ideal Gas Law Calculator
Solve pressure-volume-temperature relationships for an ideal gas from moles, absolute temperature, and volume. The calculator uses P × V = n × R × T. It returns more than one result so you can check the main answer against a useful secondary measure. Temperature must use an absolute scale and the gas constant must match the selected units. Real gases deviate from ideal behavior at high pressure, low temperature, and near phase changes.
Educational model only. Use applicable standards, calibrated measurements, and qualified review for safety-critical work.
Calculate and compare
Use the number box for precision or the slider for fast scenario testing.
Scenario results
Pressure
101.326672 kPa
From nRT/V.
Molar volume
24.465 L/mol
Volume per mole.
PV product
2,478.95703 kPa·L
Equals nRT in the ideal model.
How the calculation works
Use consistent units and retain full precision until the final display step.
Worked example
Reproduce the displayed scenario, then change one assumption at a time.
Assumptions behind the result
- • Inputs use the units shown beside each control.
- • The displayed formula is applied without hidden market or demographic data.
- • Rounding occurs only for display; calculations keep full numeric precision.
- • Temperature must use an absolute scale and the gas constant must match the selected units.
- • Real gases deviate from ideal behavior at high pressure, low temperature, and near phase changes.
Mistakes that change the answer
- • Mixing percentages with decimals or mixing incompatible units.
- • Relying on a rounded intermediate value instead of the full result.
- • Changing several assumptions at once instead of testing amount of gas separately.