Stoichiometry & gases · SL/HL
Ideal Gas Equation Calculator
This calculator uses R = 8.314462618 kPa·dm³ mol⁻¹ K⁻¹, so pressure is kPa and volume is dm³.
Your values
Start with the example or enter your own values. Use a dot for decimals and e for scientific notation.
Calculated locally. No account or input upload.
Result & working
ExampleThe calculator is loading. The worked example is also shown below.
Step-by-step working
The formula
PV = nRT
R = 8.314462618 kPa·dm³ mol⁻¹ K⁻¹
| Symbol | Meaning |
|---|---|
| P | Gas pressure in kPa. |
| V | Gas volume in dm³. |
| T | Absolute temperature in K. |
When to use this calculator
The ideal-gas model is most appropriate when intermolecular interactions and molecular volume have small effects. Convert °C to K before using the equation.
Worked example
The page opens with these example values. The result below is pre-generated for reference.
- n = PV/RT = 101.3 × 24 / (8.314463 × 293.15) = 0.9974626 mol
0.9974626 mol
Common mistakes
- Do not use °C directly.
- Use a gas constant consistent with the pressure and volume units.