What is the ICAO standard pressure at sea level?

The International Civil Aviation Organization (ICAO) standard pressure at sea level is set at 29.92 inches of mercury (inHg). This standard is important for various aviation calculations, including altimeter settings and flight planning. By adhering to this standard, pilots can ensure consistency and accuracy in determining altitude above sea level in various aircraft operations worldwide.

The standard pressure is essential for the functioning of the altimeter, which relies on atmospheric pressure to indicate altitude. Since pressure decreases with altitude, using the standardized value of 29.92 inches provides a reference point for comparing altimeter readings and ensures that all pilots are using the same baseline when flying.