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Free Stopwatch for Teachers

Count-up stopwatch with lap splits for timed challenges.

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How to use this in your class

  • •Use the stopwatch for timed math-fact drills — students love trying to beat their own personal best.
  • •Record lap splits during PE activities like shuttle runs or relay races for easy comparison across attempts.
  • •Run a classroom-wide speed-reading challenge: start the stopwatch and let students track their reading pace improvement over weeks.
  • •Use it for science experiments that require precise time measurement — students can log lap times for each trial.
  • •Start the stopwatch at the beginning of clean-up and celebrate when the class beats yesterday's time.

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Why use an online stopwatch?

A stopwatch counts up instead of down, making it the right tool whenever you need to measure how long something takes rather than set a deadline. In the classroom, stopwatches are essential for PE timing, science experiments, timed challenges, and any activity where students compete against their own previous records. An online stopwatch projected on the board makes the timing visible to everyone and eliminates the need for a physical device.

How this stopwatch works

Press Start and the stopwatch begins counting up from zero, displaying hours, minutes, seconds, and milliseconds. Press the Lap button to record a split time without stopping the clock — all laps are listed below the display for easy reference. Press Stop to pause the count, and Reset to return to zero. The interface is designed to be large and readable when projected to a class.

Online stopwatch vs. a phone stopwatch

Your phone's built-in stopwatch works fine for personal use, but it is too small for a class to see and requires you to hold your phone up or pass it around. An online stopwatch can be projected on the board, shared via a link, and accessed by students on their own devices simultaneously. Lap splits are displayed in a list that everyone can read, which is far more practical for group activities and data collection.

Tips for effective use

  • Use lap splits to record individual student times during fitness tests or relay races.
  • Project the stopwatch during group challenges and let a student volunteer operate Start, Lap, and Stop.
  • For science labs, have each group run the stopwatch on their own device and record times in their notebooks.
  • Track improvement over time by comparing stopwatch results week to week — great for goal-setting conversations.

Share to Google Classroom

Click the Share to Google Classroom button below the stopwatch to post it to any of your classes. Students can run their own stopwatch on their devices for at-home fitness challenges, timed practice tests, or science experiments.

Frequently Asked Questions

Is the online stopwatch free?
Yes. No sign-up, no ads, no cost. It runs entirely in your browser and works on any device.
Does it support lap splits?
Yes. Press the Lap button at any point to record a split time. All laps are displayed in a list below the main stopwatch display.
How accurate is the stopwatch?
The stopwatch uses your browser's high-resolution timer and is accurate to the millisecond — more than sufficient for classroom activities, PE timing, and science experiments.
Can I use it in fullscreen?
Yes. Click the Fullscreen button to fill the entire screen with the stopwatch display, making it easy to read from the back of the room or across a gymnasium.
Does the stopwatch keep running if I switch tabs?
Yes. The count continues in the background even if you navigate to another tab or app. Your elapsed time and lap records are preserved.
Can students each run their own stopwatch?
Yes. Share the URL or post it to Google Classroom. Each student gets an independent stopwatch on their own device, which is great for self-paced timing during labs or fitness activities.

Want all of these in one app?

KiwiBee combines classroom tools, behavior management, LMS, and live quiz games — free for teachers.