Back to Free Tools
FREE TOOLS
Race Split Planner
Generate equal-pace split checkpoints including the final partial interval.
Race distance (km), Target finish time (seconds), Split interval (km)
JSON
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the labelled values using the displayed units and explicit assumptions.
- Choose Calculate result and review the complete report and any undefined or no-solution states.
- Choose Download result to save the complete JSON. Reset clears the result and restores example controls.
Examples
Race distance (km): 21.0975
Target finish time (seconds): 7200
Split interval (km): 5
Limitations
- Positive distance km,target duration seconds and split interval km. At most1000 splits;exact decimal distance partition;reported times may be fractional seconds. No fitness prediction,elevation adjustment or race recommendation.
- Scalar controls accept explicit finite decimal syntax;positive values normally1e-12–1e12,nonnegative0–1e12 unless a narrower range is stated. JSON numeric rows use finite IEEE754 values within their stated bounds. Derived counts above1billion and nonfinite results refuse. Combined input<=400000UTF8 bytes;complete JSON<=4MiB. All processing stays in your browser.
Related tools
No items found.