Ready when you are
Local onlyKeep this tab visible while the short measurement runs.
↻—ready
Takes about 2 seconds
Device check
Refresh Rate Test
Estimate how many times your display updates each second and check frame timing stability.
✓ Instant result✓ No sign-up✓ Runs in your browser
01
How to use this test
- Close heavy apps or tabs for a cleaner reading.
- Start the refresh-rate measurement.
- Keep the tab visible until the result appears.
02
If something looks wrong
- Connect your monitor with a cable that supports its target refresh rate.
- Check that the highest rate is selected in display settings.
- Battery-saving modes can reduce refresh rate on some devices.
What the result means
Frame timing reveals the refresh rate available to this browser.
The tester measures the interval between successive animation frames while this tab is visible. A display refreshing near 60 times per second normally produces intervals close to 16.7 milliseconds; 120 Hz is close to 8.3 milliseconds and 144 Hz is close to 6.9 milliseconds. The final estimate uses a group of recent samples so one delayed frame has less influence.
The number represents the complete display path currently used by the browser, not the maximum printed on the monitor box. Operating-system settings, cable bandwidth, docks, power saving, variable refresh behavior and browser scheduling can all reduce or destabilize the rate that reaches the page.
Reading the signal
Compare the estimate with the rate selected in display settings.
Near 60 Hz
This is expected for a standard 60 Hz display, but it can also mean that a faster monitor is still configured at 60 Hz.
Near 120–165 Hz
The browser is receiving high-rate frames. A small difference from the advertised integer is normal because timing and common video standards are not perfectly exact.
Unstable timing
Large interval changes usually indicate background load, tab throttling, power management or variable-refresh behavior rather than a fixed panel defect.
Half the expected rate
Check the chosen display mode, cable, adapter, duplicate-display configuration and whether the laptop is using a battery-saving profile.
Browser-test limits
requestAnimationFrame measures browser presentation timing. It cannot read the panel electronics, certify overdrive behavior, measure pixel response time or prove that every game will sustain the same frame rate.
Read our complete testing methodology →Troubleshooting
From symptom to next step.
What you seeLikely causeWhat to try
Result stays near 60 HzThe operating system may be set to 60 Hz, or the connection cannot carry the intended resolution and rate.Select the higher rate in display settings, use a compatible cable and port, then keep this tab visible and retest.
Reading jumps constantlyOther work is delaying animation frames or adaptive refresh is changing presentation timing.Close demanding apps, disable battery saving temporarily and compare several runs with the browser window on the display being tested.
External monitor reports the laptop rateThe browser window or duplicated display mode may be synchronized to a different screen.Move the entire window to the target monitor, avoid spanning screens and test extended-display mode.
Quick answers
Good to know.
Is the result exact?+
It is a browser-based estimate derived from animation frame timing. System load and browser throttling can affect it.
Why does a 144 Hz monitor show 60 Hz?+
Your operating system may be set to 60 Hz, the cable or port may limit the rate, or power saving may be active.
Why does 144 Hz sometimes appear as 143 or 145 Hz?+
Sampling noise, browser scheduling and fractional display timings can move the estimate slightly. A stable result close to the selected mode is normally more meaningful than the exact integer.
Is refresh rate the same as game FPS?+
No. Refresh rate describes display updates; FPS describes frames rendered by an application. A game can render above or below the display rate.
Can this test measure monitor response time?+
No. Pixel response requires controlled visual equipment or a camera-based method. This page measures the timing of frames presented to the browser.