Hydrostatic Pressure Calculator (Pressure at Depth)
Enter the depth and choose the liquid.
Your numbers
Your results
Gauge pressure (kPa)
Gauge pressure (kPa)
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Absolute pressure (kPa)
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Absolute pressure (bar)
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Absolute pressure (psi)
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Absolute pressure (atm)
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Hydrostatic Pressure Calculator (Pressure at Depth) by TheCalcTools
How the Hydrostatic Pressure Calculator (Pressure at Depth) works
Pressure in a still liquid grows linearly with depth: P = ρgh above the surface pressure. Gauge pressure is what a tyre or depth gauge reads; absolute pressure adds the atmosphere.
In seawater pressure rises by about 1 atmosphere every 10 m, which is why divers must manage gas volumes and decompression.
The formula
P = P₀ + ρ g h
Worked example
Using the default values shown in the calculator:
| Depth (m) | 10 |
|---|---|
| Liquid | Seawater (1,025 kg/m³) |
| Pressure at the surface (kPa) | 101.325 |
| Gravity (m/s²) | 9.80665 |
- At 10 m in seawater: gauge 100.52 kPa, absolute 201.84 kPa (1.992 atm).
Result:
| Gauge pressure (kPa) | 100.52 |
|---|---|
| Absolute pressure (kPa) | 201.84 |
| Absolute pressure (bar) | 2.018 |
| Absolute pressure (psi) | 29.27 |
| Absolute pressure (atm) | 1.992 |
Frequently asked questions
What is the pressure at 10 m in the sea?
About 100.5 kPa gauge and 201.8 kPa absolute, roughly 2 atmospheres.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.