How much pressure in 30 ft of water?

The pressure exerted by a fluid is calculated using the formula: pressure (P) = depth (d) × density (ρ) × gravitational acceleration (g). For water, the density is approximately 62.4 lbs/ft³, and gravitational acceleration is about 32.2 ft/s². At a depth of 30 feet, the pressure would be approximately 30 ft × 62.4 lbs/ft³ = 1,872 lbs/ft², or about 1.3 psi (pounds per square inch) for every foot of water, resulting in around 30 psi at that depth.