{"uid":"cap_RfmIOw0XaA68Ug2dus-7n","slug":"aviation-calculators-isa-atmosphere-8366f7b0","name":"Aviation Calculators – ISA Atmosphere","description":"Standard atmosphere at an altitude: temperature, pressure, density, sound speed, and ISA deviation for a measured temperature.","url":"https://aviation-calc.x402tookit.com/isa-atmosphere?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":["altitudeFt"],"properties":{"oatC":{"type":"number","description":"Actual outside air temperature in C, to get the ISA deviation"},"altitudeFt":{"type":"number","description":"Pressure altitude in feet, -1500 to 65000"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"oatC":{"type":["null","number"]},"layer":{"type":["null","string"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"altitudeFt":{"type":["null","number"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"densityRatio":{"type":["null","number"]},"isaDeviationC":{"type":["null","number"]},"isaDensityKgM3":{"type":["null","number"]},"isaPressureHpa":{"type":["null","number"]},"speedOfSoundKt":{"type":["null","number"]},"isaPressureInHg":{"type":["null","number"]},"isaTemperatureC":{"type":["null","number"]},"isaTemperatureF":{"type":["null","number"]},"ruleOfThumbIsaTempC":{"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_Pp6xwWD6EMu9aODX6gBlZ","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":"Returns International Standard Atmosphere properties at a given pressure altitude: temperature, pressure, density, speed of sound, and optional ISA deviation from actual OAT.","exampleAgentPrompt":"What are the standard ISA atmosphere values at 35000 feet pressure altitude — temperature, pressure, density, and speed of sound — and if the actual OAT is -45°C, what's the ISA deviation?","exampleUseCases":[{"title":"Cruise altitude atmosphere check","prompt":"We're planning a flight at FL280 — can you give me the ISA standard temperature, pressure, density, and speed of sound at 28000 feet, and tell me what atmospheric layer that's in?"},{"title":"ISA deviation for performance calculation","prompt":"At 10000 feet pressure altitude, the outside air temperature is +5°C — what's the ISA deviation from standard?"},{"title":"Speed of sound for Mach calculation","prompt":"I need the speed of sound in knots at 41000 feet pressure altitude according to the standard atmosphere so I can verify my Mach number."}],"resultDescription":"Returns a JSON object with ISA temperature in °C and °F, pressure in hPa and inHg, air density in kg/m³, density ratio, speed of sound in knots, the atmospheric layer name, and — if an actual OAT was provided — the ISA deviation in °C and rule-of-thumb ISA temperature. Also includes the queried altitude and source metadata.","failureModes":["Altitude out of range (-1500 to 65000 ft) returns an error or null results","Missing required altitudeFt parameter causes a validation error","oatC omitted means ISA deviation fields return null — not an error but incomplete output","Non-numeric inputs for altitude or temperature cause schema validation failure"],"whenToPreferThis":"Use this endpoint when you need precise International Standard Atmosphere values at a specific pressure altitude for aviation performance calculations, flight planning, Mach number derivation, or ISA deviation analysis. Prefer this over general weather APIs when you need theoretical standard atmosphere properties (not actual measured conditions) or when computing ISA deviation by comparing standard to observed temperature.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:14:27.277Z","isFirstParty":false,"canonicalSlug":"aviation-calculators-isa-atmosphere-8366f7b0"}