Scuba Best Mix for Nitrox Calc can be used to find the Equivalent Air Depth (EAD) of the provided Fraction of Oxygen (FO2) at various planned diving depths when using Enriched Air Nitrox. Just enter values for "Fraction of Oxygen (FO2)" and "Planned Depth". Planning to upgrade your certification level? Want to brush up on your dive theory before you take the final exam?