Reaction time test
Click the moment the screen turns green and see how fast you react.
- 100% free
- No sign-up
- Runs in your browser
Your times
- Last
- —
- Average
- —
- 0 of 5 attempts
- Fastest
- —
- Best average
- —
- Kept in this browser
Next: Click speed test · Typing speed test · Keyboard tester
Report a problem with this tool
How to use Reaction time test
Start
Click the box, tap it or press Space. It turns red: wait, and don’t click yet.
React to green
After a random 1.5 to 5 seconds it turns green. Click or press Space as fast as you can.
See your average
After five attempts you get your average, your fastest time and how it compares with the typical 250 ms.
Why use Utils365
Precise timing
Timed from the frame that turns green to the moment you press, in milliseconds.
No cheating by guessing
The wait is random, and clicking early shows “Too soon” without counting the attempt.
Mouse, touch or keyboard
Click, tap or press Space, whichever is quickest for you. Your best average is kept in this browser.
Frequently asked questions
What is a good reaction time?
The average is about 250 ms for a visual cue on a screen. Under 200 ms is fast, and top gamers often average 150–180 ms.
How is my reaction time measured?
From the moment the green frame appears to the moment your click or key press reaches the browser. The average of five attempts smooths out lucky and slow ones.
Why is my reaction time slower than expected?
Your screen, mouse and computer add delay: a 60 Hz screen alone can add up to 16 ms, and some wireless mice add more. Tiredness, caffeine and practice also make a difference.
What does “Too soon” mean?
You clicked while the box was still red. That attempt doesn’t count; click again to retry it.
Can I improve my reaction time?
A little, with practice, good sleep and focus. Games that need quick responses help, and a high refresh rate screen and wired mouse cut the delay added by your setup.
Is it better to use the keyboard or the mouse?
Use whichever feels fastest. Many people are a few milliseconds quicker on Space, as a key press travels less than a mouse button.