Calculators & Generators

Online Stopwatch (with Laps)

Press Start (or the space bar) to time anything, and Lap to record splits.

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    Online Stopwatch (with Laps) by TheCalcTools

    How the Online Stopwatch (with Laps) works

    The stopwatch measures elapsed time with your browser’s high-resolution clock, so it stays accurate even if the display updates slowly in a background tab.

    Lap records the time since the previous lap and the running total. Press the space bar to start and stop when the page has focus.

    Worked example

    Timing three laps of a track: Lap 1: 01:32.10, Lap 2: 01:30.45, Lap 3: 01:29.80, total 04:32.35.

    Frequently asked questions

    Does it keep running if I switch tabs?

    Yes. Time is calculated from timestamps, so it is correct when you come back.

    Can I use it on my phone?

    Yes. The large display and buttons are designed for touch.

    Sources and further reading

    Countdown Timer (Online Timer with Alarm)Set a time or tap a preset, then press Start Time Duration Calculator (Between Two Dates and Times)Enter a start and end date and time to get the duration Pace Converter (min/km, min/mile, km/h, mph)Enter a pace or speed to see it in every format, with race finish times Hours Worked CalculatorFill in your shift times and see paid hours and earnings

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