Density & pressure altitude API

Computes pressure altitude from field elevation and altimeter setting, then density altitude and ISA deviation from OAT. Answers 'What is the density altitude at a 5000 ft field at 30 C?', 'How far above ISA is it today?'.

Price$0.04per request

MethodPOST

Route/v1/nav/density-altitude

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

aviationdensity-altitudepressure-altitudeisaqnhaltimeterperformancetemperature

API URLhttps://x402.hexl.dev/v1/nav/density-altitude

Integration docs

Example request

{
  "fieldElevationFt": 5000,
  "altimeterSettingInHg": 29.92,
  "oatC": 30
}

Example response

{
  "pressureAltitudeFt": 5000,
  "densityAltitudeFt": 7959,
  "isaTempAtAltitudeC": 5.1,
  "isaDeviationC": 24.9,
  "densityRatioSigma": 0.787,
  "altimeterSettingInHg": 29.92,
  "interpretation": "Density altitude 7959 ft (pressure altitude 5000 ft, ISA+24.9 deg C). Expect degraded climb/takeoff performance."
}

Input schema

{
  "type": "object",
  "required": [
    "fieldElevationFt",
    "oatC"
  ],
  "properties": {
    "fieldElevationFt": {
      "type": "number",
      "examples": [
        5000
      ]
    },
    "altimeterSettingInHg": {
      "type": "number",
      "examples": [
        29.92
      ]
    },
    "oatC": {
      "type": "number",
      "examples": [
        30
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}