Knots to MPH Calculator
Knots → mph.
Open →
Aviation
Pressure Altitude Calculator
Enter field elevation and altimeter setting to get pressure altitude.
Pressure altitude
—
At 29.92.
| Correction | — |
|---|---|
| Field elevation | — |
| Altimeter | — |
| — |
Show our math
Enter your figures above to see the step-by-step working.
Everything computed client-sideEverything computed client-side — nothing leaves this page
How the Pressure Altitude Calculator Works
Pressure altitude is your height above the standard datum plane — what the altimeter reads when set to the standard pressure of 29.92 inHg. To find it from your field elevation, add 1,000 feet for every inch of mercury the local altimeter setting is below 29.92 (or subtract for settings above it).
Enter the field elevation and the current altimeter setting and the calculator returns the pressure altitude, the first step in working out density altitude and aircraft performance.
pressure altitude = field elevation + (29.92 − altimeter) × 1000
Frequently Asked Questions
What is pressure altitude?
Altitude above the standard datum plane — the altimeter reading with 29.92 inHg set. It’s used for performance and flight-level calculations.
How do you calculate pressure altitude?
Add (29.92 − altimeter setting) × 1,000 feet to your field elevation.
Why 29.92?
It’s the standard sea-level pressure. Above the transition altitude all aircraft set 29.92 so everyone shares the same reference.
More From The Desk
Same plain method, different figuresNautical Miles to Miles Calculator
Nautical → statute miles.
Open →Crosswind Calculator
Crosswind component.
Open →Density Altitude Calculator
Performance altitude.
Open →True Airspeed Calculator
CAS → TAS.
Open →