{"uid":"cap_wddhY9m2hYYCHnx9SomKK","slug":"aviation-pressure-altitude-calculator-af935b6a","name":"Aviation Pressure Altitude Calculator","description":"Pressure altitude from field elevation and altimeter setting (inHg or hPa), exact ISA result and the 1000 ft per inHg rule.","url":"https://aviation-calc.x402tookit.com/pressure-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"],"properties":{"unit":{"type":"string","description":"inhg (default) or hpa"},"altimeter":{"type":"number","description":"Altimeter setting (QNH): inHg like 29.92 or hPa like 1013"},"elevationFt":{"type":"number","description":"Field or aircraft 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"]},"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"]},"altimeterHpa":{"type":["null","number"]},"altimeterInHg":{"type":["null","number"]},"pressureAltitudeFt":{"type":["null","number"]},"stationPressureHpa":{"type":["null","number"]},"stationPressureInHg":{"type":["null","number"]},"differenceFromElevationFt":{"type":["null","number"]},"pressureAltitudeRuleOfThumbFt":{"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_n40UMi-yNLLAx_aMrmzk3","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 pressure altitude from field elevation and altimeter setting (inHg or hPa), returning both the exact ISA result and the 1000 ft/inHg rule-of-thumb approximation.","exampleAgentPrompt":"What's the pressure altitude at an airport with a field elevation of 3500 feet and an altimeter setting of 29.65 inHg? I want both the exact ISA result and the rule-of-thumb estimate.","exampleUseCases":[{"title":"Pre-flight takeoff performance check","prompt":"Before my departure, can you calculate the pressure altitude at my home field? It's at 2800 feet elevation and the current altimeter setting is 30.05 inHg — I need it for my aircraft's takeoff distance chart."},{"title":"High-altitude airport density check","prompt":"I'm flying into Leadville, Colorado, which sits at about 9927 feet elevation. The altimeter is reading 29.45 inHg. What's the pressure altitude there, and how far off is the simple rule-of-thumb from the exact answer?"},{"title":"Flight instructor scenario teaching","prompt":"My student is learning about pressure altitude corrections. Can you show what happens to pressure altitude at a 1500-foot elevation airport when the altimeter setting drops from standard 29.92 to 29.20 inHg — give me the exact ISA figure and the rule-of-thumb side by side?"}],"resultDescription":"Returns the computed pressure altitude in feet using the exact ISA formula, along with the rule-of-thumb approximation (1000 ft per inHg deviation from 29.92), the difference between pressure altitude and field elevation, and the altimeter setting expressed in both inHg and hPa units. Also includes station pressure in both units.","failureModes":["Missing required query parameters (elevationFt or altimeter) returns an error","Elevation outside the valid range (-1500 to 30000 ft) may produce an error or unexpected result","Invalid unit string (not 'inhg' or 'hpa') may default to inHg or return an error","Altimeter value inconsistent with the specified unit (e.g. passing 1013 when unit is inhg) will yield a nonsensical result","Network or payment authorization failure returns a 402 or 5xx error"],"whenToPreferThis":"Choose this endpoint when you need a quick, accurate pressure altitude computation for aviation pre-flight planning, aircraft performance charts, or student pilot instruction — especially when you want both the precise ISA-formula result and the 1000 ft/inHg rule-of-thumb in a single call. It is ideal for automation pipelines that ingest live METAR altimeter settings and field elevations to feed into downstream performance calculations.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:34:50.206Z","isFirstParty":false,"canonicalSlug":"aviation-pressure-altitude-calculator-af935b6a"}