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Online Lap Timer & Split Stopwatch with Millisecond Accuracy

Centisecond & Millisecond Resolution•+ Lap / Split Recording•Fastest & Slowest Lap Highlighting•Swimming, Track & Speedrun Friendly

Track Individual Splits with Precision Accuracy

Whether timing track intervals, swimming laps, circuit workouts, or rubik cube solves, recording lap splits provides critical data on pacing consistency and stamina degradation.

The TimerBox Lap Timer records split times with millisecond precision. The interactive lap log highlights your fastest lap in green and slowest in red for immediate diagnostic feedback.

How to Use the Lap Timer & Split Stopwatch

1

Click Start (or press Spacebar) to initiate the high-resolution stopwatch.

2

Click + Lap / Split at each lap marker or milestone to record a split.

3

Review your lap table for immediate fastest (⚡) and slowest (🐢) lap flags.

4

Click Stop to freeze the clock or Reset to clear all recorded splits.

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Frequently Asked Questions

What is the difference between lap time and split time?

Lap time is the duration of a single isolated lap. Split time is the total cumulative elapsed time from the start of the session to that lap marker.

Can I use keyboard shortcuts to trigger laps?

Yes! Spacebar toggles start and stop, while the L key records a new lap.

Does the timer lose precision if I switch browser tabs?

No. TimerBox measures real-world timestamps via Date.now(), guaranteeing accurate millisecond delta tracking.

Ready to Start Your Lap Timer & Split Stopwatch?

Scroll up and press Start to begin your visual countdown immediately.