Ideal Gas Law Calculator

  • Enter values for Pressure, Volume, and Temperature along with their respective units.
  • Click "Calculate" to calculate the result based on the Ideal Gas Law.
  • Click "Clear" to clear the input fields and results.
  • Click "Copy" to copy the result to the clipboard.

Calculation and Explanation:

Calculation History:


    The Ideal Gas Law Calculator is a valuable tool for scientists, engineers, and students alike. It is used to analyze and predict the behavior of gases under various conditions.

    The Ideal Gas Law

    The Ideal Gas Law, denoted as PV = nRT, relates the pressure (P), volume (V), amount of substance (n), and temperature (T) of an ideal gas. This law is a fundamental concept in thermodynamics and is a close approximation for many real gases under certain conditions. The equation is as follows:

    PV = nRT


    • P is the pressure of the gas (in Pascals, Pa)
    • V is the volume of the gas (in cubic meters, m³)
    • n is the number of moles of gas (in moles, mol)
    • R is the ideal gas constant (in J/(mol·K))
    • T is the temperature of the gas (in Kelvin, K)

    Related Formulae

    Gas Constant (R)

    The ideal gas constant, R, is a key component of the Ideal Gas Law and is defined as:

    R = 8.314 J/(mol·K)

    Moles (n)

    The number of moles of a gas can be calculated using the following formula:

    n = (PV) / (RT)

    Pressure (P)

    Pressure can be calculated by rearranging the Ideal Gas Law:

    P = (nRT) / V

    Volume (V)

    Volume can be calculated by rearranging the Ideal Gas Law:

    V = (nRT) / P

    Temperature (T)

    Temperature can be calculated by rearranging the Ideal Gas Law:

    T = (PV) / (nR)

    Example Calculations

    Let’s walk through a couple of example calculations to illustrate the use of the Ideal Gas Law Calculator.

    Example 1: Calculating Pressure

    Suppose we have a container with a volume of 2.5 m³, containing 5 moles of an ideal gas at a temperature of 300 K. Using the Ideal Gas Law, we can calculate the pressure:

    P = (nRT) / V P = (5 mol * 8.314 J/(mol·K) * 300 K) / 2.5 m³ P = 3985.04 Pa

    So, the pressure inside the container is approximately 3985.04 Pascals.

    Example 2: Calculating Volume

    Let’s say we have 3 moles of gas at a pressure of 5000 Pa and a temperature of 400 K. We can calculate the volume using the Ideal Gas Law:

    V = (nRT) / P V = (3 mol * 8.314 J/(mol·K) * 400 K) / 5000 Pa V = 199.37 m³

    The volume of the gas is approximately 199.37 cubic meters.

    Real-World Use Cases

    The Ideal Gas Law and its calculator find applications in various fields:

    Chemistry and Chemical Engineering

    • Used to predict the behavior of gases in chemical reactions and industrial processes.
    • Helps in designing and optimizing chemical reactors and distillation columns.


    • Used to model the behavior of gases in the Earth’s atmosphere, aiding in weather predictions.
    • Essential for understanding phenomena like the ideal gas law’s effect on weather balloons.

    Automotive Engineering

    • Employed in engine design and emissions control systems.
    • Helps engineers calculate gas properties within internal combustion engines.

    Environmental Science

    • Used to study the behavior of gases in natural environments and pollutants in the atmosphere.
    • Helps in understanding air quality and climate change.


    • Fundamental in gas kinetic theory, providing insights into the motion of gas particles.
    • Applied in high-energy physics experiments involving particle collisions.


    The Ideal Gas Law Calculator is a versatile tool that enables scientists and engineers to understand and predict the behavior of gases in various real-world scenarios. By applying the Ideal Gas Law and its related formulae, professionals from different fields can make informed decisions and optimize processes.

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