Enter fluid density, depth, and gravity, then click Calculate.

Hydrostatic pressure is the pressure exerted by a fluid at rest due to the force of gravity. It increases linearly with depth and depends on the fluid density and gravitational acceleration. The fundamental equation is P = ρ·g·h, where P is the pressure, ρ (rho) is the fluid density, g is the gravitational acceleration, and h is the depth. This pressure acts equally in all directions and is independent of the shape or size of the container. Gauge pressure measures the pressure relative to atmospheric pressure, while absolute pressure includes atmospheric pressure. This calculator is essential for applications in engineering, oceanography, scuba diving, hydraulics, and fluid mechanics. Understanding hydrostatic pressure is crucial for designing dams, submarines, pressure vessels, and measuring water levels. The calculator allows you to choose between different units: Pascals, atmospheres, bar, or PSI.

1. Enter the Fluid Density (kg/m³) – use 1000 for water at 4°C.
2. Enter the Depth in meters – how far below the surface.
3. Enter the Gravity value (m/s²) – use 9.81 for Earth’s surface.
4. Select your preferred pressure Unit (Pa, atm, bar, or PSI).
5. Click Calculate Pressure to get gauge and absolute pressure.
6. The result shows both gauge pressure and pressure including atmosphere.
7. Click Reset to restore default example values.