DeviceJig

Refresh Rate Test

See what rate your browser is drawing at on your monitor, laptop or phone, to one decimal, and whether it matches what you paid for.

Keep this tab in front. A background tab reads low or stops.

Browser draw rate (not a screen rating)

-- Hz

Result

Not measured yet

Press the button and leave the page alone for about 5 seconds.

Frame skip check

A small block changes position every frame for 10 seconds. It starts only when you press the button.

Counts late frames for 10 seconds.

Result

Not run yet

Close other apps for a fair count.

Motion check

Fast-moving blocks. It starts only when you press the button.

The top block moves every frame, the bottom one every second frame. On a fast screen, the top block looks clearly smoother.

Limits of a browser: what this can't tell you
  • This times how often your browser draws (requestAnimationFrame). That usually equals the display rate, but it's not a reading from the panel.
  • Background tabs, battery saver, low power mode and some browsers can lower the rate.
  • On screens with variable refresh, or phones that adapt their rate, the reading can differ from one run to the next.
  • With two monitors, the reading is for the one this window is on, and browsers may follow the main display.
  • It can't see frames dropped by the monitor itself, or overdrive and response time.

Takes about 5 seconds.

How to check your monitor's refresh rate

  1. Close video and other heavy tabs. Plug in a laptop.
  2. Pick the rate you paid for, if you know it.
  3. Press Measure and leave the page alone for about 5 seconds.
  4. If it reads low, follow the listed settings, then measure again.

Is this what I paid for?

  • A match within 2.5% counts as yes: 143.9 Hz is a 144 Hz screen, and 59.94 Hz is a 60 Hz setting.
  • The usual reason for 60 Hz on a faster screen is a system setting. A new monitor may need the higher rate chosen by hand.
  • Cable and port versions can cap the rate.
  • "Regular frames" under 85% means the reading wasn't steady, so we say that instead of giving you a number to trust.

Common questions

How do I test if my monitor is 144Hz?

Select 144 Hz under "Sold as" and press Measure. A reading between about 140 and 148 Hz means it's running at that rate. If it reads 60, look in your display settings first.

How to test if a monitor is 120Hz?

The same way: select 120 Hz and measure. Then run the motion check. The top block should look noticeably smoother than the bottom one, which moves at half the rate.

How do I check my PC monitor refresh rate?

On Windows, go to Settings, System, Display, Advanced display. On a Mac, go to System Settings, Displays. Those show the chosen setting. This page shows what the browser is actually drawing at.

Why does my refresh rate test read low?

The most common reasons are a background tab, battery saver, a browser frame cap, a busy computer, or a display setting. Keep the tab in front and try again. A low reading alone doesn't mean the screen is faulty.

Is this an FPS test?

In a way: it counts the frames per second your browser draws, which usually follows your display's refresh rate. It doesn't measure the FPS of a game, which depends on the game and your graphics card.

Related tests

Privacy

Any page counting is cookie-free; see the privacy page. Results stay in this browser and join your device report.

Technical reference, read 2026-11-01: MDN: Window.requestAnimationFrame().

Windows is a trademark of Microsoft Corporation. Mac is a trademark of Apple Inc. G-Sync is a trademark of NVIDIA Corporation, and FreeSync of Advanced Micro Devices, Inc. HDMI is a trademark of HDMI Licensing Administrator, Inc. DeviceJig is independent and is not affiliated with these companies.

All 11 tests, by device

Find your device, pick the numbered part you want to check.

Screen

Mouse

Keyboard

Controller

Speakers

Headphones