Best Nitrox Mix Calculator
Calculate the richest Nitrox mix for a planned depth and selected ppO₂ limit, then compare it with the mix you actually have.
Match the mix to the depth.
Choose target depth and oxygen partial-pressure limit. The calculator returns the theoretical maximum oxygen fraction, MOD and Equivalent Air Depth.
How the best Nitrox mix is estimated
The theoretical best mix is based on target depth and the selected maximum ppO2. The oxygen fraction is calculated so the chosen ppO2 is reached at that depth, then limited to the recreational Nitrox range used by this calculator.
Example: at 30 m the absolute pressure is about 4 bar. With a ppO2 limit of 1.4 bar, the theoretical oxygen fraction is about 35%, so a mix around EAN35 places the planned depth close to that oxygen limit.
This is a theoretical planning value, not a recommendation to use the maximum possible oxygen percentage. Analysed gas, training limits, conservatism, CNS exposure and the complete dive plan must also be considered.
The calculator updates instantly from the values you enter and shows the core planning result in the dark result card.
Use realistic values from your own diving and leave a practical margin for changes in workload, conditions and equipment.
Treat this page as an educational reference and cross-check the result with your training, analysed gas and an appropriate dive-planning method.