Stopwatch Lap Time Calculator

Paste lap durations in mm:ss or hh:mm:ss format to calculate summary statistics instantly.

Lap times — one per line (mm:ss or hh:mm:ss)

Average lap

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—Laps

—Total

—Fastest

—Slowest

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 statistics summarize individual lap durations such as total, average, fastest and slowest.
Interpretation: Averages can hide pacing variation; compare the lap list as well as the mean.

Recent saved snapshots

Calendar or duration rule

Lap statistics summarize individual lap durations such as total, average, fastest and slowest.

Averages can hide pacing variation; compare the lap list as well as the mean.

Repeat-use support

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