{"uid":"cap_Xxt0EJBqtDq1CzjOe4mJe","slug":"aviation-calculators-true-airspeed-mach-equivalent-airspeed-a0871f75","name":"Aviation Calculators – True Airspeed, Mach & Equivalent Airspeed","description":"True airspeed, Mach and equivalent airspeed from calibrated airspeed, pressure altitude and outside air temperature.","url":"https://aviation-calc.x402tookit.com/true-airspeed?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":["casKt","pressureAltitudeFt"],"properties":{"oatC":{"type":"number","description":"Outside (static) air temperature in C; defaults to ISA at that altitude"},"casKt":{"type":"number","description":"Calibrated airspeed in knots (indicated corrected for instrument and position error), 20 to 600"},"pressureAltitudeFt":{"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"]},"mach":{"type":["null","number"]},"casKt":{"type":["null","number"]},"tasKt":{"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"}},"densityRatio":{"type":["null","number"]},"temperatureC":{"type":["null","number"]},"tasMinusCasKt":{"type":["null","number"]},"speedOfSoundKt":{"type":["null","number"]},"ruleOfThumbTasKt":{"type":["null","number"]},"pressureAltitudeFt":{"type":["null","number"]},"equivalentAirspeedKt":{"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_O9ZenYc-owCriVOXWvd3v","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 true airspeed (TAS), Mach number, and equivalent airspeed (EAS) from calibrated airspeed, pressure altitude, and outside air temperature.","exampleAgentPrompt":"What's my true airspeed and Mach number if my calibrated airspeed is 280 knots, I'm at a pressure altitude of 35000 feet, and the outside air temperature is -52°C?","exampleUseCases":[{"title":"Cruise flight plan TAS entry","prompt":"I'm filing a flight plan at FL280 with a calibrated airspeed of 240 knots and it's -40°C outside — what true airspeed should I enter?"},{"title":"Mach limit check at high altitude","prompt":"At 41000 feet pressure altitude with a CAS of 260 knots and OAT of -56°C, what Mach number am I at? I need to make sure I'm below MMO 0.82."},{"title":"Student pilot airspeed theory homework","prompt":"Can you show me the true airspeed, equivalent airspeed, and density ratio for a CAS of 120 knots at 8000 feet with a standard ISA temperature?"}],"resultDescription":"Returns a JSON object containing true airspeed (tasKt), Mach number, equivalent airspeed (equivalentAirspeedKt), calibrated airspeed echo (casKt), pressure altitude (pressureAltitudeFt), static temperature (temperatureC), density ratio, speed of sound (speedOfSoundKt), TAS minus CAS delta (tasMinusCasKt), a rule-of-thumb TAS estimate (ruleOfThumbTasKt), and metadata fields including summary, verdict, disclaimer, and degraded status.","failureModes":["Missing required casKt or pressureAltitudeFt returns a validation error","CAS outside range 20–600 knots may return an error or degraded result","Pressure altitude outside -1500 to 65000 ft range may return an error","Extreme or physically implausible OAT values may yield degraded results or null outputs","Network or payment (x402) failures return HTTP 402 or 5xx"],"whenToPreferThis":"Choose this endpoint when you need a precise, multi-output airspeed conversion including TAS, Mach, EAS, density ratio, and speed of sound in a single call, especially for flight planning, performance calculations, or educational use. It supports ISA deviation and optional real OAT input, making it more complete than a simple rule-of-thumb TAS calculator.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:35:23.474Z","isFirstParty":false,"canonicalSlug":"aviation-calculators-true-airspeed-mach-equivalent-airspeed-a0871f75"}