{"uid":"cap_CfIXWfyFo3U77wGeDhjrb","slug":"aviation-density-altitude-calculator-661de54e","name":"Aviation Density Altitude Calculator","description":"Density altitude from field elevation, altimeter setting and temperature, exact and by rule of thumb, with a performance flag.","url":"https://aviation-calc.x402tookit.com/density-altitude?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["elevationFt","altimeter","oatC"],"properties":{"oatC":{"type":"number","description":"Outside air temperature in C, -60 to 60"},"unit":{"type":"string","description":"inhg (default) or hpa"},"altimeter":{"type":"number","description":"Altimeter setting: inHg like 29.92 or hPa like 1013"},"elevationFt":{"type":"number","description":"Field elevation in feet, -1500 to 30000"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"oatC":{"type":["null","number"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"elevationFt":{"type":["null","number"]},"densityRatio":{"type":["null","number"]},"isaDeviationC":{"type":["null","number"]},"airDensityKgM3":{"type":["null","number"]},"densityAltitudeFt":{"type":["null","number"]},"pressureAltitudeFt":{"type":["null","number"]},"stationPressureHpa":{"type":["null","number"]},"densityAltitudeAboveFieldFt":{"type":["null","number"]},"densityAltitudeRuleOfThumbFt":{"type":["null","number"]},"isaTemperatureAtPressureAltitudeC":{"type":["null","number"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_bJV4xihzT_40EUboRMmSO","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates density altitude (exact and rule-of-thumb) from field elevation, altimeter setting, and outside air temperature, with a performance flag.","exampleAgentPrompt":"What's the density altitude at a field elevation of 5,500 feet with an altimeter setting of 29.85 inHg and an outside air temperature of 32°C? Give me both the exact value and the rule-of-thumb result, and let me know if performance is a concern.","exampleUseCases":[{"title":"Hot-and-high takeoff performance check","prompt":"I'm departing from a mountain airport at 7,200 feet elevation. The altimeter is 30.02 inHg and it's 35°C outside. What's my density altitude and should I be worried about aircraft performance?"},{"title":"Flight school lesson on density altitude","prompt":"Can you compute the density altitude for a field at 1,200 feet elevation, altimeter set to 29.92 inHg, and temperature of 25°C? I want to see both the precise calculation and the rule-of-thumb estimate so I can compare them."},{"title":"Pre-flight check at high-elevation desert airport","prompt":"Before I take off from this desert airport at 4,800 feet with the altimeter reading 29.65 inHg and OAT of 40°C, what's the density altitude and does the performance flag look okay?"}],"resultDescription":"Returns exact density altitude in feet, rule-of-thumb density altitude in feet, pressure altitude, station pressure in hPa, air density in kg/m³, density ratio, ISA deviation and ISA temperature at pressure altitude, density altitude above field, plus a human-readable summary, verdict/performance flag, degraded flag, disclaimer, and a list of reasons behind the assessment.","failureModes":["Missing required parameters (elevationFt, altimeter, oatC) returns an error","Out-of-range values (e.g. elevation below -1500 ft or above 30000 ft, OAT outside -60 to 60°C) may return a validation error or degraded result","Invalid altimeter unit specification may cause incorrect conversion","Payment not included or insufficient USDC triggers 402 payment required response"],"whenToPreferThis":"Use this endpoint when you need a rigorous, aviation-standard density altitude computation — including both exact ISA-based calculation and the pilot rule-of-thumb estimate — along with a performance flag indicating whether density altitude is operationally significant. Prefer this over manual calculation or generic atmospheric tools when flight safety or aircraft performance planning is involved.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:30:43.821Z","isFirstParty":false,"canonicalSlug":"aviation-density-altitude-calculator-661de54e"}