CNS Oxygen Toxicity Calculator

The Central Nervous System (CNS) Oxygen Toxicity Calculator is designed to help divers manage oxygen exposure and reduce the risk of CNS oxygen toxicity. By monitoring the partial pressure of oxygen (PPO₂) and cumulative CNS load in accordance with NOAA guidelines, the calculator provides accurate data to support safer dive planning.

This calculator determines a diver’s CNS oxygen toxicity exposure by evaluating the PPO₂ at depth and comparing it to NOAA single-exposure limits. It incorporates residual CNS carryover between dives, using a 90-minute half-life for surface intervals under 24 hours. For intervals exceeding 24 hours, the CNS load is reset automatically, offering precise calculations for consecutive and multi-day diving activities.

How to Use the CNS Calculator:

1. Add a Dive: Begin by adding the details of your first dive.
2. Include Dive Segments: If your dive involved using different gases, divide it into segments. For each segment, specify the time spent using a particular gas and its composition.
3. Multiple Dives: If you completed multiple dives, add each dive separately, including all corresponding segments and details. Keep in mind that the CNS clock resets approximately 24 hours after your last dive.