Split Time to Lap Time Calculator

Paste cumulative split times to derive each interval lap time and compare pacing consistency.

Cumulative split times — one per line

Derived laps

Lap	Lap time	Split

—Average lap

—Fast–slow range

Calculation breakdown & reusable snapshots

WebToolArc mirrors the current inputs and visible result so you can copy or save a local snapshot without changing the calculator’s original controls.

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Formula / rule: lap n = cumulative split n − cumulative split n−1.
Interpretation: Cumulative split times must be non-decreasing for physically meaningful lap durations.

Recent saved snapshots

Calendar or duration rule

lap n = cumulative split n − cumulative split n−1.

Cumulative split times must be non-decreasing for physically meaningful lap durations.

Repeat-use support

You can copy the current input/result summary or save up to five explicit snapshots locally in this browser.