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Ideal Gas Law Calculator

Chemistry
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Calculates pressure, volume, temperature, or the number of moles of an ideal gas using the Ideal Gas Law: PV = nRT. Where P = pressure, V = volume, n = number of moles, R = ideal gas constant, and T = temperature.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Pressure (P), Volume (V), Number of Moles (n), and Temperature (T) in the units shown.

Step 2

Read Ideal Gas Constant (R), Calculated Temperature (T), Calculated Number of Moles (n), Calculated Volume (V), and Calculated Pressure (P) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Standard Temperature and Pressure (STP)

Pressure (P): 1 atm; Volume (V): 22.4 L; Number of Moles (n): 1 mol; Temperature (T): 273.15 K

Ideal Gas Constant (R): 0.0821 L⋅atm/(mol⋅K); Calculated Temperature (T): 272.8380024 K; Calculated Number of Moles (n): 0.9988577794 mol; Calculated Volume (V): 22.425615 L; Calculated Pressure (P): 0.006732710965 atm

Example 1

Pressure (P): 2 atm; Volume (V): 10 L; Number of Moles (n): 0.5 mol; Temperature (T): 300 K

Ideal Gas Constant (R): 0.0821 L⋅atm/(mol⋅K); Calculated Temperature (T): 487.2107186 K; Calculated Number of Moles (n): 0.8120178644 mol; Calculated Volume (V): 6.1575 L; Calculated Pressure (P): 0.001368333333 atm

Example 2

Pressure (P): 1.5 atm; Volume (V): 5 L; Number of Moles (n): 0.25 mol; Temperature (T): 350 K

Ideal Gas Constant (R): 0.0821 L⋅atm/(mol⋅K); Calculated Temperature (T): 365.408039 K; Calculated Number of Moles (n): 0.2610057421 mol; Calculated Volume (V): 4.789166667 L; Calculated Pressure (P): 0.0002932142857 atm

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