Pressure altitude from field elevation and altimeter setting (inHg or hPa), exac...

{ "method": "GET", "queryParams": { "altimeter": 29.42, "elevationFt": 5000, "unit": "inhg" }, "type": "http" }

{ "example": { "altimeterHpa": 996.28, "altimeterInHg": 29.42, "asOf": "2026-10-11T14:44:08.837Z", "degraded": false, "differenceFromElevationFt": 450.7, "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.", "elevationFt": 5000, "notChecked": [ "temperature: pressure altitude ignores it (see /density-altitude)", "instrument error, local pressure changes since the setting was issued, and mountain-wave or frontal pressure effects", "…2 more" ], "pressureAltitudeFt": 5450.7, "pressureAltitudeRuleOfThumbFt": 5500, "reasons": [ "Pressure altitude is the altitude in the standard atmosphere that has the station's pressure; set 29.92 inHg (1013.25 hPa) and the altimeter reads it.", "Station pressure comes from the altimeter setting on a standard lapse; then pressure altitude = ISA altitude at that pressure." ], "source": "computed locally", "stationPressureHpa": 828.95, "stationPressureInHg": 24.479, "summary": "At 5000 ft with an altimeter setting of 29.42 inHg (996.3 hPa) the pressure altitude is 5451 ft (the 1000 ft per inHg rule gives 5500 ft).", "verdict": "COMPUTED" }, "type": "json" }