Meters of seawater to atmospheres absolute
Type a value in msw to get it in ATA instantly.
4ATA
That's 1.43× as deep as an open water dive, while the recreational limit is 1.25× deeper. A lungful of surface air would be squeezed to about one 4th of its volume.
Convert the other way: ATA to msw
What it means
How much pressure is that?
Seawater adds one atmosphere every 10 m; fresh water needs 10.3 m for the same, because it is less dense.
The math
How to convert msw to ATA
Depth adds to the atmosphere already above you: ATA = depth in msw ÷ 10 + 1, and in feet ATA = fsw ÷ 33 + 1.
Example: 30 msw = 4 ATA.
Every unit
Your depth in every unit
Tables
msw to ATA conversion table
| msw | ATA |
|---|---|
| 0 msw | 1 ATA |
| 5 msw | 1.5 ATA |
| 10 msw | 2 ATA |
| 15 msw | 2.5 ATA |
| 20 msw | 3 ATA |
| 30 msw | 4 ATA |
| 40 msw | 5 ATA |
| 50 msw | 6 ATA |
| 60 msw | 7 ATA |
| 100 msw | 11 ATA |
| 200 msw | 21 ATA |
ATA to msw conversion table
| ATA | msw |
|---|---|
| 0 ATA | -10 msw |
| 5 ATA | 40 msw |
| 10 ATA | 90 msw |
| 15 ATA | 140 msw |
| 20 ATA | 190 msw |
| 30 ATA | 290 msw |
| 40 ATA | 390 msw |
| 50 ATA | 490 msw |
| 60 ATA | 590 msw |
| 100 ATA | 990 msw |
| 200 ATA | 1,990 msw |
Quick answers
Quick answers
- How many ATA is 1 msw?
- 1 msw is 1.1 ATA.
- How many ATA is 10 msw?
- 10 msw is 2 ATA.
- How many ATA is 30 msw?
- 30 msw is 4 ATA.
The units
About these units
Meters of seawater (msw)
Depth in the sea. Every 10 m adds one atmosphere.
Atmospheres absolute (ATA)
Total pressure, counting the atmosphere above the water.
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