STP Calculator
Calculate gas volume and moles at Standard Temperature and Pressure (STP)
Calculate at Standard Temperature and Pressure
Volume of gas at initial conditions
Temperature at initial conditions
Pressure at initial conditions
STP Calculation Results
STP Conditions: 0°C (273.15 K), 1 atm (101.325 kPa)
Molar Volume at STP: 22.4 L/mol
Calculation: Using combined gas law: V₁/T₁ × P₁ = V₂/T₂ × P₂
Formula: V_STP = V × (273.15/T) × (P/1)
Example STP Calculations
Oxygen at Room Temperature
Convert 10 L of O₂ at 25°C and 1 atm to STP conditions
Nitrogen at High Pressure
Convert 5 L of N₂ at 100°C and 2 atm to STP conditions
Carbon Dioxide at Low Temperature
Convert 15 L of CO₂ at -20°C and 0.8 atm to STP conditions
STP Reference Values
Standard Temperature
Standard Pressure
Molar Volume
Common Gases
Related Gas Laws
Understanding Standard Temperature and Pressure (STP)
What is STP?
Standard Temperature and Pressure (STP) are reference conditions used in chemistry to compare gas properties. STP is defined as 0°C (273.15 K) and 1 atmosphere pressure. At these conditions, one mole of any ideal gas occupies exactly 22.4 liters.
Key Applications
- •Gas Volume Calculations: Determine volume at standard conditions
- •Molar Volume: Calculate number of moles from volume
- •Gas Comparisons: Compare different gases under standard conditions
STP Calculations
Combined Gas Law
V₂ = V₁ × (T₂/T₁) × (P₁/P₂)
V₂ = Final volume (at STP)
V₁ = Initial volume
T₂ = STP temperature (273.15 K)
T₁ = Initial temperature
P₁ = Initial pressure
P₂ = STP pressure (1 atm)
Moles from Volume
n = V / 22.4
Where V is volume in liters at STP
Practical Applications
Laboratory Analysis
Compare gas samples collected under different conditions by converting to STP.
Industrial Processes
Calculate gas volumes for reactor design and process optimization.
Environmental Monitoring
Standardize gas concentration measurements for pollution monitoring.