Pulmonary Oxygen Toxicity Units (OTU)
Pulmonary oxygen-toxicity units = t x [(PO2 - 0.5) / 0.5]^0.83 (t minutes, PO2 in ATA); a single-dive limit of ~615 OTU is commonly used.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Oxygen partial pressure PO2
- 1.4 ATA
- Exposure time
- 30 minutes
Result: Oxygen toxicity units 48.9 — within the ~615 single-dive limit.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- <= ~615
- Within the common single-dive limit.
- > ~615
- Above the single-dive limit (t x [(PO2 - 0.5)/0.5]^0.83; lower multi-day REPEX averages apply). An exposure value, not a diagnosis.
What you enter
- Oxygen partial pressure PO2
- Exposure time
How this is calculated
Pulmonary oxygen-toxicity units (OTU) = t x [(PO2 - 0.5)/0.5]^0.83 (Wright/Bardin-Lambertsen; see DMAC 35 and Sheffield/Vann references). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.