Science & engineering
Ideal gas pressure calculator
Estimate absolute pressure from gas amount, volume and temperature.
A clear answer. Here’s how.
Ideal gas law P = nRT/V, converting litres to m³. Uses R = 8.31446261815324 J/(mol·K). Reports absolute pressure, not gauge pressure. An ideal-gas approximation may be inaccurate at high pressure or near condensation.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Amount of gas (mol)
- 1
- Gas volume (litres)
- 24.465
- Absolute temperature (K)
- 298.15
Example result
- Absolute pressure (Pa)
- 101,326.671964
- Absolute pressure (kPa)
- 101.326671964
- Absolute pressure (atm)
- 1.000016501