Gas Volume at STP Calculator to Find Molar Volum...
Calculate the volume of any gas at Standard Temperature and Pressure (STP). Apply the ideal gas law and understand molar volume with worked examples.
What is Gas Volume at STP?
At Standard Temperature and Pressure (STP: 0°C and 1 atm), one mole of any ideal gas occupies exactly 22.414 liters. This molar volume is a fundamental constant used throughout stoichiometry and gas law calculations.
💨 Gas Volume at STP Calculator
Use our free calculator for instant, accurate results.
📐 Formula
V = n × 22.414 L/mol (at STP)
Or use ideal gas law: PV = nRT. At STP: P=101325 Pa, T=273.15 K, R=8.314 J/(mol·K). IUPAC 2010 STP uses 100 kPa → 22.711 L/mol.
📝 Worked Example
How many liters does 3 moles of CO₂ occupy at STP?
V = 3 × 22.414 = 67.24 L
Similarly: 2g of H₂ = 1 mol → V = 22.414 L
📝 How to Use the Calculator
❓ FAQ
What is the difference between STP and SATP?
STP = 0°C, 1 atm (old IUPAC) or 0°C, 100 kPa (new). SATP = 25°C, 1 bar. Molar volume at SATP ≈ 24.8 L/mol.
Do real gases occupy exactly 22.4 L at STP?
No — 22.414 L/mol is the ideal gas value. Real gases deviate slightly based on intermolecular forces (compressibility factor Z ≠ 1).
Veer Kumavat
Founder & AuthorVeer is a 14-year-old student from Nashik, Maharashtra, who built SciFi Calculators to help students worldwide master STEM subjects. He is passionate about making complex science and math problems accessible through intuitive digital tools.