Free tool

Scroll speed test, how fast do you scroll?

Scroll the tall box with a mouse wheel, trackpad, touch screen or the keys for 5, 10 or 30 seconds. You get your average and peak speed in pixels a second, the distance, how many wheel events were sent and how big each step was, with a bar for every second. Use it to compare devices and smooth scrolling settings.

Scroll the box

Time

The scrolling is measured in this page. Nothing is sent anywhere.

What it watches

A real scroll box, not a guess.

01 / Scroll

Position changes

The box is a real scrolling area. The page adds up how far it moves, whether you use a wheel, a trackpad, a touch screen or the keys.

02 / Wheel

Wheel events

Each wheel event is counted, with its smallest and largest step in pixels, so you can see how your wheel or trackpad steps.

03 / Speed

Average and peak

Pixels a second over the round, and the fastest half second scaled up to a second.

Guide

How to use the scroll speed test, and read it.

A scroll speed test measures how fast you scroll. Scroll the tall box with your mouse wheel, trackpad, touch screen or the arrow keys, and the page measures the distance you cover, your average and peak speed in pixels a second, how many wheel events you sent, and the size of each step. The box is very long and starts in the middle, so you will not reach the end in a round, and it works in both directions.

How to use the scroll speed test

Pick Time: 5 s, 10 s or 30 s.
Move the pointer over the box and start scrolling. A phone or tablet can swipe it. The first move starts the clock.
Scroll up and down however you like for the whole round. The top of the box shows the distance so far.
When the time ends you get the cards and a bar for every second. Scroll again to start a new round.

What the numbers mean

Average speed is the distance divided by the seconds in the round. If you cover 12,500 px in a 5 second round, the average is 2,500 px a second. Peak speed takes the most you covered in any half second and doubles it, so it shows your top pace. Distance adds up every move, with the down and up parts shown separately.

Wheel events and Step size show how your device sends scrolling. A notched mouse wheel tends to send fewer, larger steps. A trackpad or a free-spinning wheel tends to send many small ones. The page does not guess which device you have. It shows the numbers, and you can compare two devices or two settings with the same time. When the browser reports a step in lines, the page counts a line as 16 px. That is this page's own assumption, and it is said on the card.

Distance	Time	Average speed
12,500 px	5 s	2,500 px a second
30,000 px	10 s	3,000 px a second
66,000 px	30 s	2,200 px a second

Comparing settings and devices

Run the same time with smooth scrolling on and then off in your browser or system settings, and compare the step size and the distance.
Run it on a mouse and on a trackpad. The step counts will differ a lot even if the distance is similar.
Do three rounds and look at the best, since a single round depends on how hard you flick.
Keep the same page zoom for each run. Zoom changes the size of a pixel.

Limits

Pixels are the page's own pixels, not millimetres on your screen, so a scaled display can show different numbers for the same flick. A browser can add smoothing that spreads one wheel step over many frames. The test measures what your browser does, which is what you feel when you browse. It does not measure the mouse hardware.

To test the other parts of the same mouse, use the mouse click test. To check how smooth the screen itself moves, try the refresh rate test.

Questions

Good to know.

How do I test my scroll speed?

Scroll the box for the time you picked, with whatever you normally use. The page adds up the distance and shows pixels a second.

What is a pixel a second?

How many pixels of the page move past each second. A taller screen shows more pixels at once, so a higher number means a faster scroll.

Why are there two ways of measuring?

The box position gives the true distance. The wheel events show how the device sends steps. They answer different questions.

Why does my trackpad show so many wheel events?

A trackpad sends a stream of small steps while your fingers move, and a mouse wheel sends fewer, bigger ones. That is normal.

Does the test work with a touch screen?

Yes. A swipe moves the box, so the distance and speed are counted. There are no wheel events on a touch swipe.

Why does the box not reach the end?

It is 400,000 px tall and starts in the middle, and the page moves you back to the middle when you get far from it, so you can keep going in any direction.

Does page zoom change the result?

Yes. Zoom changes how big a pixel is. Use the same zoom when you compare.

Is anything sent anywhere?

No. The scrolling is measured in this page. Only your best average is kept in this browser.