Gas Pressure at Depth Calculator
Calculate the pressure at a given depth in water, seawater, or other fluids.
Supports metric and imperial units.
Pressure at Depth
Hydrostatic Pressure is the pressure exerted by a fluid at rest due to gravity.
P = ρ × g × h + P_atm
Where:
- ρ = fluid density (kg/m³)
- g = gravitational acceleration (9.81 m/s²)
- h = depth below surface
- P_atm = atmospheric pressure (101,325 Pa)
Common fluid densities:
| Fluid | Density (kg/m³) |
|---|---|
| Fresh water | 1,000 |
| Seawater | 1,025 |
| Mercury | 13,600 |
| Oil (typical) | 870 |
Pressure increases:
- Fresh water: ~9.81 kPa per meter (0.433 psi per foot)
- Seawater: ~10.05 kPa per meter (0.445 psi per foot)
- Every 10m of seawater ≈ 1 additional atmosphere