Hydrostatic Pressure Calculator (Water Depth)
Hydrostatic pressure calculator: water pressure at a given depth, for diving, tanks and dams.
p = ρ · g · h
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
p = ρ·g·h is the pressure from the fluid above (gauge pressure). Add atmospheric pressure for the absolute value.
In fresh water pressure rises by about 1 bar every 10 m.
Formula
p = ρ · g · h
| Symbol | Quantity | Units |
|---|---|---|
| ρ | Fluid density | kg/m³, g/cm³, g/mL, g/L, kg/L, lb/ft³, lb/gal |
| h | Depth | m, km, cm, mm, µm, nm, pm, Å, in, ft, yd, mi, nmi, au, ly |
| p | Gauge pressure | Pa, kPa, MPa, hPa, bar, mbar, atm, Torr, mmHg, psi, inHg |
Constants used: g = 9.80665 m/s²
Worked example
Given: ρ = 1 000 kg/m³ · h = 10 m
p = ρ g h
Result: p = 0.980665 bar
Frequently asked questions
Pressure at 10 m of fresh water?
0.98 bar gauge, about 1.99 bar absolute.