Pressure at Depth Calculator
Water pressure rises with depth. Enter a depth and choose fresh or salt water to see how much pressure the water adds, and the total with the air above it.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Pressure from water is its density, times gravity, times depth. Salt water is denser than fresh water, so the same depth gives slightly more pressure.
The total adds the air pressure at the surface, a standard sea-level value of about 101 kilopascals. This is physics for the depth you enter, and it is not a dive plan.
Worked example
At 33 ft of depth, the water adds 14.7 psi of pressure, bringing the total to 29.4 psi.
Questions
Why is salt water heavier?
Dissolved salt makes sea water denser than fresh water, so it pushes a little harder at the same depth.
Does the total include the air above?
Yes. The total adds a standard sea-level air pressure. The added figure is the water alone.
Can I plan a dive with this?
No. It shows the physics only. Dive planning needs proper training and tables from a qualified source.
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