Ideal Gas Law Calculator
Calculate pressure, volume, moles, temperature using PV = nRT
How to Use
- Select what you want to calculate (pressure, volume, moles, or temperature)
- Enter the three known values in the input fields
- Choose the appropriate units for each value
- Click calculate to get the fourth value
- View the results in multiple units for convenience
- Copy the results to your clipboard for later use
About This Tool
Our free ideal gas law calculator uses the fundamental chemistry formula PV = nRT to solve gas law problems. Whether you need to calculate pressure, volume, moles, or temperature, this calculator handles it all. The ideal gas law relates pressure, volume, amount of gas (moles), and temperature using the gas constant R. Perfect for students, chemists, and anyone working with gas chemistry. The calculator supports multiple units including atmospheres, kilopascals, mmHg, torr, bar for pressure; liters, milliliters, cubic meters for volume; and Kelvin, Celsius, Fahrenheit for temperature. All calculations happen instantly in your browser with complete privacy.
Frequently Asked Questions
What is the ideal gas law?
The ideal gas law is PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature. It relates the four variables of an ideal gas.
What units does this calculator support?
Our ideal gas law calculator supports atmospheres, kilopascals, mmHg, torr, and bar for pressure; liters, milliliters, and cubic meters for volume; and Kelvin, Celsius, and Fahrenheit for temperature.
What is the gas constant R?
The gas constant R has different values depending on the units used. Common values include 0.0821 L·atm/(mol·K), 8.314 J/(mol·K), and 62.36 L·mmHg/(mol·K).
When does the ideal gas law apply?
The ideal gas law applies to ideal gases under standard conditions. Real gases deviate from ideal behavior at high pressures and low temperatures, but the law is a good approximation for many situations.
