Ideal Gas Law Calculator (PV = nRT) – With Steps, Density & Volume Options

Use this free Ideal Gas Law Calculator to solve PV = nRT equations with step-by-step guidance. Supports calculations with molar mass, density, constant volume, and air properties. Whether you're working in liters, milliliters, or cubic meters, this tool helps you understand pressure, volume, temperature, and moles in real time. Ideal for chemistry students, engineers, and educators.

Ideal Gas Law Calculator

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Pressure (P) Pa atm mmHg

Volume (V) m³ L mL

Moles (n)

Temperature (T) K °C °F

Explanation of the Ideal Gas Law

The Ideal Gas Law is an equation of state for a hypothetical ideal gas. It is a good approximation to the behavior of many gases under many conditions, although it has several limitations. The equation is given by:

PV = nRT

Where:

• P is the pressure of the gas.
• V is the volume of the gas.
• n is the amount of gas in moles.
• R is the universal gas constant (8.314 J/(mol·K)).
• T is the temperature in Kelvin.

The Ideal Gas Law combines several simpler gas laws, including Boyle's Law, Charles's Law, and Avogadro's Law. It describes the relationship between pressure, volume, temperature, and the number of moles of gas.