Underwater Pressure Calculator — P = P₀ + ρgh

Every 10 m of water adds about one atmosphere of pressure. Divers feel it in their ears; submarines are built around it.

How to interpret the result

At 15 m depth the absolute pressure is ~2.5 atm — which is why scuba divers must equalize and ascend slowly.

Assumptions

• Fresh/salt water approximated at ρ = 1000 kg/m³
• g = 9.81 m/s²
• Surface pressure 1 atm