Independent tool
1.3 ATA is 4.4 psi gauge (19.1 psi absolute), 131.7 kPa, 1.317 bar, 9.9 feet of seawater, and 3.02 meters of seawater. The table below uses the same constants for 1.3, 1.4, 1.5, 2.0, 2.4, and 3.0 ATA.
Not medical advice. Ask your doctor before starting hyperbaric oxygen therapy. These tools do not prescribe a session count or a pressure.
106 chambers in this database list a maximum of at least 1.30 ATA. The chamber directory can filter from 1.3 ATA upward.
Airvida Chair Pro (1.3 ATA), Airvida OxyPro 28 (1.3 ATA), Airvida OxyPro 36 (1.3 ATA), Huelight H-800 Lying (1.3 ATA), Huelight Sit (1.3 ATA) and 101 more.
| ATA | psi gauge | psi absolute | kPa | bar | feet seawater | meters seawater | Chambers at or above |
|---|---|---|---|---|---|---|---|
| 1.3 | 4.4 | 19.1 | 131.7 | 1.317 | 9.9 | 3.02 | 106 |
| 1.4 | 5.9 | 20.6 | 141.9 | 1.419 | 13.2 | 4.02 | 72 |
| 1.5 | 7.3 | 22.0 | 152.0 | 1.520 | 16.5 | 5.03 | 64 |
| 2.0 | 14.7 | 29.4 | 202.7 | 2.027 | 33.0 | 10.06 | 39 |
| 2.4 | 20.6 | 35.3 | 243.2 | 2.432 | 46.2 | 14.08 | 19 |
| 3.0 | 29.4 | 44.1 | 304.0 | 3.040 | 66.0 | 20.12 | 17 |
Constants: 1 ATA = 14.6959 psi = 101.325 kPa = 1.01325 bar. Feet of seawater = (ATA - 1) × 33. Meters = feet × 0.3048.
ATA is absolute pressure in standard atmospheres. 1 ATA is the air at the surface: 14.6959 pounds per square inch, absolute. Psi gauge subtracts that atmosphere, so gauge psi = (ATA - 1) × 14.6959. A figure such as 4.4 psi on a soft chamber is gauge, not absolute.
Kilopascals and bar in the table are absolute, matching ATA. Depth uses the conventional 33 feet of seawater for each atmosphere above the surface. Meters are those feet times 0.3048. Displayed values are rounded. The converter keeps the full constants until it rounds.
In this database, 61 soft-shell chambers list a maximum of 1.2 to 2 ATA. 37 hard-shell monoplace chambers list a maximum of 1.45 to 3 ATA. 9 hard-shell multiplace chambers list a maximum of 1.5 to 3 ATA. Counts use max_pressure_ata on each chamber record. A listed maximum is not a promise that every session is run at that pressure.
The atmosphere constants are the standard atmosphere: 1 atm = 101.325 kPa = 14.6959 psi = 1.01325 bar. The depth step is the conventional 33 feet of seawater per additional atmosphere, used in diving and hyperbaric tables, then converted to meters at 0.3048 meters per foot.
Chamber classes and the “at or above” counts come from this site’s chamber database (107 chambers). The field is max_pressure_ata. The directory can filter at 1.3, 1.5, 2.0, and 3.0 ATA. Pressures between those steps are counted on this page.
This converter is not sponsored. It does not rank chambers and it does not say which pressure a person should use.
1.3 ATA is 4.4 psi gauge (19.1 psi absolute), 9.9 feet of seawater, and 3.02 meters of seawater. Gauge psi is the pressure above the surrounding air. Absolute psi includes that air.
ATA is an absolute pressure. It counts the atmosphere you are already in at the surface, so 1.0 ATA is about 14.7 psi absolute and 0 psi gauge. A listing that says 4.4 psi for a mild soft chamber is gauge pressure, not absolute pressure.
2.0 ATA is one extra atmosphere, which is 33.0 feet of seawater or 10.06 meters of seawater on the 33-feet-per-atmosphere convention used here. It is also 14.7 psi gauge.
This page does not decide that. In this database, 61 soft-shell chambers list a maximum of 1.2 to 2 ATA. 37 hard-shell monoplace chambers list a maximum of 1.45 to 3 ATA. 9 hard-shell multiplace chambers list a maximum of 1.5 to 3 ATA. Whether a listed pressure fits a person is a question for their doctor. Condition guides on this site describe published research. They are not a dose.
In this database, 61 soft-shell chambers list a maximum of 1.2 to 2 ATA. 37 hard-shell monoplace chambers list a maximum of 1.45 to 3 ATA. 9 hard-shell multiplace chambers list a maximum of 1.5 to 3 ATA. Those are listed maximums in our chamber database, not a statement that every session is run at the maximum.
Not medical advice. Ask your doctor before starting hyperbaric oxygen therapy. These tools do not prescribe a session count or a pressure.
Condition guides describe published research. They are not a dose.
