{"calculator":{"slug":"finish-time-predictor","math":{"href":"https://www.tracktoolspro.com/api/calculators/finish-time-predictor","jsonPointer":"/calculator/math","version":"2026-10-21.1","implementationVersion":"b5a8aca7b85361476e0321a08b7fa5f516fc9535","scope":"Canonical HTTP function and documented corresponding mounted-form math. This is public inspectable documentation, not access control or independent empirical validation.","unitNotation":"Input paths use [] and *; output paths are JSON Pointers with * (one segment) and ** (descendants). Empty output path denotes scalar result. Units apply to numeric quantities or explicitly described numeric strings; labels/statuses/booleans are dimensionless. More specific units, including count/index exceptions, override broad patterns.","interfaceNotes":["HTTP input is described by the adjacent inputSchema. The original handlers may accept numeric strings; this metadata adds no validation.","Mounted forms accept displayed clock/unit strings and enforce their own limits. Mounted tools limit strings to 200 characters and numeric parts to magnitude 1000000. Do not assume mounted/API input interchangeability.","Some legacy extreme/invalid tuples can produce null/empty results or nonfinite numbers serialized as null. Those are unavailable answers, not exact numerical predictions. Per-calculator domain describes the intended mathematical inputs."],"kind":"arithmetic","implementationFiles":["lib/formulas/pace.ts"],"equations":["pacePerMeter = splitSeconds/splitMeters; projectedSeconds = pacePerMeter*raceMeters; percentComplete = min(100,100*splitMeters/raceMeters)."],"inputUnits":{"splitSeconds":"s","splitMeters":"m","raceMeters":"m"},"outputUnits":{"/projectedSeconds":"s","/pacePerMeter":"s/m","/percentComplete":"%"},"domain":["Positive finite tuple and representable positive time/pace; invalid values return null."],"rounding":["Raw IEEE-754 numbers; the mounted page formats clocks separately."],"assumptions":["Uses the entered values and the selected convention; this documentation does not strengthen existing validation."],"limitations":["Linear extrapolation only. PercentComplete is capped, but a split beyond race distance is not rejected and projection still follows the equation."],"mountedPageNotes":[],"workedExamples":[{"input":{"splitSeconds":300,"splitMeters":1600,"raceMeters":5000},"expected":{"/projectedSeconds":937.5},"absoluteTolerance":1e-8,"note":"Illustrative canonical-handler result; not independent validation of an empirical model."}],"constantsAndTables":{"completionPercentCap":100},"sources":[{"title":"Canonical HTTP binding at the documented implementation revision","url":"https://github.com/wickthumb/track_tools_pro_marketing/blob/b5a8aca7b85361476e0321a08b7fa5f516fc9535/lib/calculator-functions.ts","note":"Existing calculation handler; math metadata is additive."},{"title":"lib/formulas/pace.ts","url":"https://github.com/wickthumb/track_tools_pro_marketing/blob/b5a8aca7b85361476e0321a08b7fa5f516fc9535/lib/formulas/pace.ts","note":"Primary implementation source for these equations/tables, not a claim of scientific calibration."}]},"annotations":{"readOnlyHint":true,"consequentialHint":false},"name":"Race Finish Time Predictor","description":"Predict your race finish time based on your time at any split checkpoint. Enter your split and see your projected finish assuming even pacing throughout the race.","category":"Pace & Time","method":"POST","endpoint":"/api/calculators/finish-time-predictor","page":"/calculators/finish-time-predictor","inputSchema":{"type":"object","required":["splitSeconds","splitMeters","raceMeters"],"properties":{"splitSeconds":{"type":"number","description":"Elapsed split time in seconds.","minimum":0},"splitMeters":{"type":"number","description":"Distance already covered in meters.","minimum":0},"raceMeters":{"type":"number","description":"Full race distance in meters.","minimum":0}}},"example":{"splitSeconds":300,"splitMeters":1600,"raceMeters":5000}}}