Result
- Add oxygen
- 28 bar
- Top up with air
- 122 bar
Planning aid, not a dive computer. More
Metric (m, bar, L, kg) or imperial (ft, psi, cu ft, lb).
How it works
- Gases are added by partial pressure: each one raises the cylinder’s pressure by its share of the target. Air supplies all the nitrogen, which fixes how much air goes in; the oxygen and helium make up the rest, less what the air already carries.
- The plan treats gases as ideal, so a real fill drifts a little.
- Test the mix in the cylinder before you dive, and use oxygen-clean equipment above 40%.
The same calculations run in the Loggerfish app.