Reference & charts
Gas Constant R Values Reference
Gas constant R reference table for unit conversions.
The value of R depends on the units used for pressure and volume. Always match R to your problem's units.
Common gas constant R values (all with mol and K in denominator)
| R value | Pressure unit | Volume unit | Energy unit |
|---|---|---|---|
| 0.08206 | atm | L | — |
| 8.314 | Pa (N/m²) | m³ | J |
| 8.314 | kPa | L | J |
| 62.36 | mmHg (torr) | L | — |
| 1.987 | cal | — | cal/(mol·K) |
| 0.08314 | bar | L | — |
Frequently asked questions
How do I use this Ideal Gas Law reference?
Find your category or range in the table, then use the linked calculator to compute an exact value for your inputs.
Calculator
Ideal Gas Law Calculator