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Running Pace & Race Prediction Calculator
x402
Running Pace & Race Prediction Calculator is a paid API for AI agents from fitness-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
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.
Price / call$0.02
Success—
StatusUnknown
How this service works
Running pace per km and per mile, speed, and predicted times for other race distances using the Riegel formula.
Output
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.
Example use cases
Post-race pace breakdown
“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?”
Marathon time prediction from 5k result
“I ran a 5k in 22:40 last weekend. Using the Riegel formula, what would my predicted marathon finish time be?”
Training plan target pacing
“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?”
Technical details
Endpoint
GEThttps://fitness-calc.x402tookit.com/pace-race?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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