Pressure altitude calculator
Pressure altitude from field elevation and the altimeter setting, with the working shown. Results update as you type.
PA = elev + (29.92 − altimeter) × 1000Computed in ft · inHg. Entries in other units are converted first.Worked example — with your numbers
- PA = 5,000 + (29.92 − 29.82) × 1000 = 5,100 ft
What pressure altitude is
Pressure altitude is the height in the standard atmosphere that matches the air pressure where you are. It is what the altimeter reads with the standard setting, 29.92 inHg (1013 hPa), in the window.
Each inch of mercury the altimeter setting sits below standard adds about 1,000 ft, which is the (29.92 − altimeter) × 1000 term in the formula. A setting above standard takes the same amount off.
Where you use it
Pressure altitude is the starting point for density altitude and true airspeed, and the altitude most aircraft performance charts are drawn against. Higher up it is also what you fly: above the transition altitude, 18,000 ft in the United States, everyone sets the standard setting and altitudes become flight levels.
Related calculators
Solve it on your iPhone. The same pressure altitude math, a keypad built for the cockpit, and METAR paste that fills in the altimeter setting. The free calculators stay free.
App Store · coming soonFor training and supplemental situational awareness only. Not for use as the sole basis for flight planning, performance, or operational decisions. It is not an approved flight planning tool, electronic flight bag (EFB), or primary source of aeronautical information. Always use current aircraft documents, an official briefing, and pilot judgment.