What is the pressure altitude formula?

The pressure altitude formula is used to determine the altitude of an aircraft based on atmospheric pressure and is vital for flight operations. The correct formula is calculated by subtracting the current altimeter setting from the standard pressure setting of 29.92 inches of mercury (inHg), then multiplying that difference by 1,000 feet, and finally adding the field elevation.

This approach provides a consistent reference for altitude measurements, as pressure altitude is used in various phases of flight and provides vital information for aircraft performance calculations. Understanding and accurately applying this formula is crucial, especially when flying in varying weather conditions, as atmospheric pressure can fluctuate significantly.

By using this specific formula, pilots can convert their altimeter setting to pressure altitude, which is essential for ensuring safety, complying with air traffic regulations, and maintaining optimal aircraft performance.