How this calculator works
A stationary fluid supports the weight of the water above it. At constant density and gravity, gauge pressure increases linearly with depth. Absolute pressure also includes the pressure applied at the surface. Fresh and salt water options are rounded working densities rather than temperature-dependent property models. At very large depths, density changes and compressibility need a more complete model.
Formula
p_gauge = rho g h; p_absolute = p_surface + rho g h; h = p_gauge/(rho g).
Worked example
At 10 m in 1000 kg/m3 fresh water and standard gravity, gauge pressure is 98066.5 Pa. Adding 101325 Pa surface pressure gives 199391.5 Pa absolute.
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Frequently asked questions
What is the difference between gauge and absolute?
Gauge pressure is the increase relative to the surface. Absolute pressure includes the surface pressure.
Does salt water produce more pressure?
At the same depth and gravity, a denser liquid gives a proportionally larger pressure increase.
Can I use a different planet?
Yes. Enter its gravitational acceleration and an appropriate liquid density and surface pressure.