Feet of seawater to atmospheres absolute
Type a value in fsw to get it in ATA instantly.
1.909ATA
That's 1.27× as deep as snorkelling depth, while an open water dive is 1.47× deeper. A lungful of surface air would be squeezed to about one 1.91th of its volume.
Convert the other way: ATA to fsw
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 fsw 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 fsw = 1.90909 ATA.
Every unit
Your depth in every unit
Tables
fsw to ATA conversion table
| fsw | ATA |
|---|---|
| 0 fsw | 1 ATA |
| 5 fsw | 1.15152 ATA |
| 10 fsw | 1.30303 ATA |
| 15 fsw | 1.45455 ATA |
| 20 fsw | 1.60606 ATA |
| 30 fsw | 1.90909 ATA |
| 40 fsw | 2.21212 ATA |
| 50 fsw | 2.51515 ATA |
| 60 fsw | 2.81818 ATA |
| 100 fsw | 4.0303 ATA |
| 200 fsw | 7.06061 ATA |
ATA to fsw conversion table
| ATA | fsw |
|---|---|
| 0 ATA | -33 fsw |
| 5 ATA | 132 fsw |
| 10 ATA | 297 fsw |
| 15 ATA | 462 fsw |
| 20 ATA | 627 fsw |
| 30 ATA | 957 fsw |
| 40 ATA | 1,287 fsw |
| 50 ATA | 1,617 fsw |
| 60 ATA | 1,947 fsw |
| 100 ATA | 3,267 fsw |
| 200 ATA | 6,567 fsw |
Quick answers
Quick answers
- How many ATA is 1 fsw?
- 1 fsw is 1.0303 ATA.
- How many ATA is 10 fsw?
- 10 fsw is 1.30303 ATA.
- How many ATA is 30 fsw?
- 30 fsw is 1.90909 ATA.
The units
About these units
Feet of seawater (fsw)
The US measure: 33 feet to the atmosphere.
Atmospheres absolute (ATA)
Total pressure, counting the atmosphere above the water.
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