Original: Pressure and thickness The average atmospheric pressure, at sea level, is about 1 atmosphere (atm) = 101.3 kPa (kilopascals) = 14.7 psi (pounds per square inch) = 760 torr = 29.9 inches of mercury (symbol Hg).
Simplified: The average pressure of the atmosphere at sea level is about 101.4 kilopascals (about 14.7 pounds per square inch).