Use this calculator to estimate the density of air, Nitrox or Trimix at a selected depth. Enter the oxygen and helium percentages; the remaining percentage is calculated as nitrogen.
Reference values used by this calculator: an ideal gas density of 5.2 g/L or lower and an absolute maximum of 6.2 g/L.
How to use the scuba gas density calculator
- Enter the oxygen percentage of your breathing gas.
- Enter the helium percentage. For air or Nitrox, leave helium at 0%.
- Enter the planned depth in metres. The result updates automatically.
How the calculation works
The calculator treats the remaining gas as nitrogen and estimates density using the oxygen, helium and nitrogen proportions at the selected ambient pressure. Results are shown in grams per litre (g/L).
Need a cylinder filled with air, Nitrox or Trimix? View our scuba tank filling services in Melbourne or contact Simple Dive to discuss your requirements.
Planning notice: This calculator is an educational planning aid. Verify gas analysis, depth limits and the complete dive plan using appropriate training, procedures and equipment before every dive.