STP Calculator

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Old STP (pre-1982) is still the most widely taught definition. IUPAC updated it in 1982 to 100 kPa. NIST NTP uses 20 °C. SATP uses 25 °C and 100 kPa.
Volume of the gas sample at its current temperature and pressure.
Temperature of the gas sample.
Pressure of the gas sample.
Enter the molar mass of the gas to also get its density at the chosen standard conditions. Leave 0 to skip.
g/mol
Volume at standard conditionsSub-molar volume
4.5807L

Gas volume corrected to the chosen standard temperature and pressure

Moles of gas0.2044mol
Molar volume22.4141L/mol
Standard temperature273.15K
Standard pressure101.325kPa
0.2044 mol
Trace<0.5Sub-molar0.5-11-2 mol1-2Multi-molar2+

4.5807 L at Old STP (IUPAC pre-1982)

  • Your gas sample contains 0.2044 mol, occupying 4.5807 L at Old STP (IUPAC pre-1982).
  • One mole of any ideal gas occupies exactly 22.4141 L at these standard conditions.
  • Your sample is warmer than standard temperature and must be cooled from 298.1 K to 273.15 K.
  • The ideal gas law assumes no intermolecular forces. Real gases deviate slightly at high pressures or near condensation.

Next stepFor high pressures or low temperatures, use the Van der Waals equation for a more accurate result.

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