Ideal Gas Law Calculator

Formula

Where P = pressure, V = volume, n = moles, R = gas constant, T = temperature

How to Use

1. Enter any three of the four values (P, V, n, T)
2. Leave the value you want to calculate blank
3. Select appropriate units for each measurement
4. Click Calculate to find the missing value

Gas Constants (R)

• R = 0.0821 L·atm/(mol·K) (most common)
• R = 8.314 J/(mol·K) (SI units)
• R = 62.4 L·mmHg/(mol·K) (mmHg units)
• The calculator automatically selects the appropriate constant

Assumptions

• Gas particles have negligible volume
• No intermolecular forces between particles
• Particles move in random motion
• Collisions are perfectly elastic
• Temperature is above critical temperature

Applications

• Gas behavior calculations
• Chemical reaction stoichiometry
• Gas collection experiments
• Industrial gas processes
• Environmental studies

Important Notes

• Temperature must be in Kelvin for calculations
• Units must be compatible with the gas constant
• Works best for low pressure and high temperature
• Real gases may deviate from ideal behavior