Scroll Speed Test
Scrolls per second is wheel events divided by seconds. 50 scroll events in 5 seconds is 10 per second.
How to use
- Choose a test length from 1 to 100 seconds.
- Move the pointer over the box and scroll the mouse wheel or swipe on your trackpad. The first scroll starts the timer.
- Keep scrolling until time is up. The page does not scroll while the test runs.
- Read the scrolls per second and the chart, then try again.
How it works
Scrolls per second = wheel events / test length in seconds, rounded to two decimals.
One event is one report from the wheel to the browser. A notched wheel sends one event per click of the notch. A smooth or free-spinning wheel and most trackpads send many small events, so their numbers are far higher and are not comparable with a notched wheel.
What the number means
This is the rate of scroll events the browser receives, not the distance you moved. A notched wheel at normal speed gives roughly 5 to 15 events per second, and a fast flick can pass 25. A free-spin wheel or a trackpad swipe can give 60 or more because it sends a stream of events with inertia.
Reading the result
- Compare only with the same device. A wheel, a trackpad and a free-spin wheel measure different things.
- Peak shows your best second. A tall first bar then low ones is a single flick, not a sustained scroll.
- Some mouse drivers apply acceleration and send fewer or larger events. Switch it off for a clean reading.
Touch screens
A touch screen does not send wheel events when you swipe, so nothing is counted on a phone or tablet. Use a mouse or a laptop trackpad.
FAQ
Why does the page not scroll while I test?
Scroll events over the box are used for the test, so the page is held in place. Move the pointer outside the box to scroll the page again.
Why is a trackpad so much higher than a wheel?
A trackpad sends many small events for one swipe, plus inertia events after your fingers lift. A notched wheel sends one event per notch.
Does scroll direction matter?
No. Up and down events count the same.
Does it work on a phone?
No. Touch swipes are not wheel events, so the count stays at zero.