Equivalent Air Depth Calculator

    Calculate the equivalent air depth for Nitrox diving to determine your no-decompression limits.

    Enter Dive Parameters

    Input your actual dive depth and oxygen percentage to calculate the equivalent air depth.

    About Equivalent Air Depth

    Equivalent Air Depth (EAD) is a concept used in Nitrox diving to relate the nitrogen absorption of a nitrox mix to that of air at a different depth. Since nitrox contains a higher percentage of oxygen and lower percentage of nitrogen than air, the body absorbs less nitrogen at the same depth compared to breathing air.

    By calculating the EAD, you can use standard air dive tables to plan your nitrox dive. This allows you to take advantage of the reduced nitrogen loading while maintaining safety protocols.

    Formula:

    EAD = ((FN2 / 0.79) × (Depth + 10)) - 10

    Where:

    • FN2 = Fraction of nitrogen in your mix (1 - FO2)
    • Depth = Your actual dive depth in meters
    • 0.79 = The fraction of nitrogen in air (79%)