{"uid":"cap_xbL6O8wsJsbpXDVbe50uy","slug":"running-pace-race-prediction-calculator-7e01651b","name":"Running Pace & Race Prediction Calculator","description":"Running pace per km and per mile, speed, and predicted times for other race distances using the Riegel formula.","url":"https://fitness-calc.x402tookit.com/pace-race?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":["distance","time"],"properties":{"time":{"type":"string","description":"Finish time as m:ss or h:mm:ss"},"distance":{"type":"string","description":"Distance: a number with unit (5km, 3.1mi, 800m) or a name: 5k, 10k, half, marathon, mile"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"time":{"type":["null","string"]},"source":{"type":["null","string"]},"formula":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"speedKmh":{"type":["null","number"]},"speedMph":{"type":["null","number"]},"pacePerKm":{"type":["null","string"]},"disclaimer":{"type":["null","string"]},"distanceKm":{"type":["null","number"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"pacePerMile":{"type":["null","string"]},"predictions":{"type":["null","object"],"properties":{"3k":{"type":["null","string"]},"10k":{"type":["null","string"]},"half":{"type":["null","string"]},"mile":{"type":["null","string"]},"1500m":{"type":["null","string"]},"marathon":{"type":["null","string"]}}},"timeSeconds":{"type":["null","number"]},"distanceMiles":{"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_n1te1PrEmpyN4WI1YFw-E","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 running pace per km and per mile, speed in km/h and mph, and predicts finish times for other race distances using the Riegel formula from a given distance and finish time.","exampleAgentPrompt":"I ran a half marathon in 1:52:30 — what's my pace per km and per mile, and what would the Riegel formula predict for my marathon finish time?","exampleUseCases":[{"title":"Post-race pace breakdown","prompt":"I just finished a 10k in 48:15 — can you tell me my pace per km, my pace per mile, and how fast I was running in km/h?"},{"title":"Marathon time prediction from 5k result","prompt":"I ran a 5k in 22:40 last weekend. Using the Riegel formula, what would my predicted marathon finish time be?"},{"title":"Training plan target pacing","prompt":"If I want to run a half marathon in exactly 2 hours, what pace per km and per mile do I need to hold, and what does that predict for a full marathon?"}],"resultDescription":"Returns pace per km (e.g. '5:12/km'), pace per mile (e.g. '8:22/mi'), speed in km/h and mph, distance in both km and miles, time in seconds, and a predictions object with Riegel-formula estimated finish times for standard race distances including mile, 1500m, 3k, 5k, 10k, half marathon, and marathon.","failureModes":["Missing required 'distance' or 'time' query parameters returns an error","Unrecognized distance format (not a number with unit or named distance like '5k', 'marathon') returns a parse error","Malformed time string (not m:ss or h:mm:ss format) returns a validation error","Extremely short distances or times may yield unreliable Riegel predictions"],"whenToPreferThis":"Choose this endpoint when you need to compute running pace, speed, or cross-distance race time predictions from a single known race result. It is purpose-built for endurance running metrics and applies the established Riegel formula for predictions, making it ideal for runners analyzing performance or setting race goals. Prefer it over generic calculators when you need both pace units (per km and per mile) and structured predictions for multiple race distances in a single call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:35:23.477Z","isFirstParty":false,"canonicalSlug":"running-pace-race-prediction-calculator-7e01651b"}