Calculate pressure at a given depth below a fluid surface. Use this calculator for fresh water, salt water, oil, gasoline, mercury, or a custom fluid and get results in PSI, kPa, Pa, bar, and atmospheres.
Depth:
Enter the vertical depth below the fluid surface. The deeper the point, the more fluid weight is above it.
Fluid density:
Select a common fluid or enter a custom density. Denser fluids create more pressure at the same depth.
Pressure type:
Choose gauge pressure for fluid pressure only, or absolute pressure to include atmospheric pressure.
A pressure at depth calculator is useful for pools, wells, tanks, ponds, reservoirs, diving examples, seawater pressure, fluid mechanics, storage vessels, and hydrostatic pressure estimates.
Pressure at depth is caused by the weight of fluid above the point being measured.
The basic pressure at depth formula is:
P = ρ × g × h
Multiply fluid density by gravity and depth. The formula is P = ρ × g × h.
Fresh water at 30 feet deep creates about 13.0 PSI of gauge pressure.
No. For a still fluid, pressure at depth depends mainly on density, gravity, and vertical depth below the surface.
Gauge pressure is the pressure from the fluid column only. Absolute pressure includes atmospheric pressure plus the fluid pressure.