What this calculator does
Ideal gas law works out pressure, volume, temperature and moles of a gas. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaPV = nRT with R = 8.314 J/(mol·K); T in kelvin
The inputs explained
| Field | What to enter |
|---|---|
| Pressure (kPa) | A number, measured in kPa. Starts at 101.325. |
| Volume (litres) | A number, measured in litres. Starts at 22.4. |
| Temperature (°C) | A number, measured in °C. Starts at 0. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with pressure
Every other input is held at the calculator’s starting values while pressure varies. Select any row to load that scenario into the calculator.