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Calculate Race Splits
Add or subtract running, swimming, or cycling lap times for training analysis.
No login required
Formats: HH:MM:SS (e.g. 01:30:45) or HH:MM (e.g. 02:15)
Result
02:15:30
2h 15m 30s Β· 8130 seconds total
135.50
minutes
2.258
hours
8,130
seconds
Race Splits tips
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For marathon training, calculate target paces β total time / planned splits.
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Sum repeated interval durations to verify your training session totals.
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Use "Time between" for split analysis β how long from mile 13 to mile 20?
How It Works
1
Enter
Enter your data into the tool above. Everything stays local to your browser.
2
Process
The tool processes your data instantly in your browser using JavaScript. No server, no waiting.
3
Download
Get your result instantly. Nothing is stored after you leave the page β complete privacy.
Why use ours?
βCompletely free β no hidden costs, ever
βNo account, email, or login required
βFiles never leave your device
βNo file size limits whatsoever
βNo watermarks on any output
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