{"uid":"cap_TSmfTcFEIRMf1sNkbnOgu","slug":"enright-1998-six-minute-walk-distance-calculator-34a3d188","name":"Enright 1998 Six-Minute Walk Distance Calculator","description":"Enright 1998 predicted six-minute walk distance (meters) from sex, age 40-80, height_cm, and weight_kg (Table 3 height/weight: male 7.57H−5.02age−1.76W−309; female 2.11H−2.29W−5.78age+667). Reports predicted_m and lln_m (minus 153 m men or 139 m women). Optional walked_m (0-1500) yields percent_predicted. Not a timed walk, BMI-equation path, or 80%/400 m class. Not a medical device.","url":"https://api.magentlab.com/api/calc/6mwd","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","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":["sex","age"],"properties":{"age":{"type":"integer","description":"Age in years (integer 40-80). Enright 1998 derivation range."},"sex":{"enum":["female","male"],"type":"string","description":"Sex used by Enright 1998 Table 3 (separate male and female height/weight equations)."},"walked_m":{"type":"number","description":"Optional distance walked in meters (0-1500). When present, percent_predicted = walked_m / predicted_m × 100. magent does not time the walk."},"height_cm":{"type":"number","description":"Height in centimeters (50-250). Provide height_cm or height_in."},"height_in":{"type":"number","description":"Height in inches (20-98). Converted as cm = in × 2.54."},"weight_kg":{"type":"number","description":"Weight in kilograms (1-500). Provide weight_kg or weight_lb."},"weight_lb":{"type":"number","description":"Weight in pounds (2-1100). Converted as kg = lb × 0.45359237."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_b5LX42DTLc-AzBfHNXDCC","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates predicted six-minute walk distance (meters) and lower limit of normal using the Enright 1998 equations, with optional percent-predicted from an actual walked distance","exampleAgentPrompt":"Using the Enright 1998 equations, what is the predicted six-minute walk distance for a 68-year-old male who is 175 cm tall and weighs 82 kg — and if he actually walked 410 meters, what percent predicted is that?","exampleUseCases":[{"title":"Pre-cardiac rehab functional baseline","prompt":"I have a 72-year-old female patient entering cardiac rehab — she's 162 cm tall and weighs 74 kg. What's her Enright-predicted 6-minute walk distance and the lower limit of normal so I can document her baseline?"},{"title":"Post-treatment progress check","prompt":"My 58-year-old male patient is 180 cm and 90 kg. He walked 520 meters on today's 6-minute walk test. Can you tell me his predicted distance and what percent predicted his result is using the Enright 1998 formula?"},{"title":"Pulmonary clinic reference range lookup","prompt":"For a 64-year-old woman who is 5 feet 5 inches tall and 155 pounds, what does the Enright 1998 equation say her predicted 6-minute walk distance should be, and what's the lower limit of normal?"}],"resultDescription":"Returns predicted_m (the Enright 1998 predicted six-minute walk distance in meters for the given sex, age, height, and weight), lln_m (lower limit of normal: predicted minus 153 m for males or 139 m for females), and optionally percent_predicted (walked_m divided by predicted_m times 100) when walked_m is supplied.","failureModes":["Age outside 40–80 range — returns error; Enright equations are not validated outside derivation range","Missing required sex or age parameters — returns 400 validation error","Height or weight outside plausible bounds (e.g. height_cm < 50 or > 250) — returns validation error","Providing neither height_cm nor height_in — returns error requiring at least one height input","walked_m outside 0–1500 range — returns validation error","Conflicting or implausible anthropometric combinations may produce extreme but technically valid outputs"],"whenToPreferThis":"Use this endpoint when you need the Enright 1998 Table 3 sex-specific linear regression prediction for 6-minute walk distance (not a BMI-based equation, not a general fitness score, and not a timed-walk cutoff classifier). Prefer this over generic fitness calculators when you need a clinical reference value with a defined lower limit of normal for adults aged 40–80 in rehabilitation, pulmonary, or cardiac contexts.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T07:07:52.922Z","isFirstParty":false}