Free Online Display Test
Free Refresh Rate Test
Measure your display's estimated refresh rate, browser FPS, frame time and motion stability directly in your browser.
Works with compatible monitors, laptops, tablets and mobile devices. No browser permission is required.
Measure Your Screen Refresh Rate
Keep this browser tab visible and avoid resizing the browser while the measurement is running.
Browser-based estimate
The browser exposes animation timing rather than the monitor's hardware refresh setting directly. Background activity, scheduling and power saving can affect the result.
Test duration
Choose a 3, 5, 10 or 15 second measurement. A longer run can provide more animation-frame samples when the browser remains stable.
Estimated refresh rate
The main result estimates the active display refresh rate in hertz from browser animation-frame timing.
Moving Object Test
Use the animated object to compare perceived motion smoothness. Higher refresh rates usually reduce visible stepping when frame delivery is stable.
Frame-time measurements
- Average frame time
- The typical number of milliseconds between measured browser frames.
- Minimum frame time
- The shortest recorded frame interval during the measurement.
- Maximum frame time
- The longest recorded frame interval during the measurement.
- Measured frames
- The number of valid browser animation-frame intervals sampled.
- Frame-time variation
- An estimate of how consistently frames arrived.
- Estimated dropped frames
- An estimate based on unusually slow frame intervals relative to the expected timing.
Live Measurement Graph
The graph displays frame timing in milliseconds so stable and slower intervals can be compared visually.
Display Information
The page also reports the browser environment used for the test, including screen size, device pixel ratio, viewport, page visibility, animation support and fullscreen support.
No Display Data Is Uploaded
Measurements are calculated locally from browser animation timestamps. The test does not capture your screen.
How to Use the Refresh Rate Test
- Close demanding games, videos and background tabs.
- Keep the browser visible and stationary.
- Select a duration and press Start Test.
- Wait until the progress reaches 100%.
- Review the Hz result and frame-time graph.
- Repeat the test to confirm consistency.
Refresh Rate and Frame Time
Refresh rate is measured in hertz. A 60 Hz display can update roughly 60 times per second, while a 144 Hz display can update roughly 144 times per second.
Lower and more consistent frame times normally produce smoother motion.
What the Online Refresh Rate Test Measures
This browser-based refresh rate tester samples animation-frame timing to estimate how frequently your screen is updating. It also reports frame time, timing variation, measured frames and possible dropped-frame events.
Estimated refresh rate
The main result converts median browser frame time into an estimated hertz value and compares it with common display refresh rates.
Average frame time
Average frame time shows the typical number of milliseconds between browser animation frames during the measurement.
Minimum and maximum timing
The fastest and slowest recorded frame intervals help reveal spikes, interruptions and uneven browser presentation.
Frame-time variation
Variation estimates how consistently frames arrived. Lower variation generally indicates steadier browser animation timing.
Estimated dropped frames
Slower intervals are compared with the expected frame duration to estimate possible missed or delayed frames.
Visible motion smoothness
The moving-object preview helps you compare perceived stepping and smoothness at the refresh rate currently used by the browser.
Refresh Rate and Frame-Time Guide
A higher refresh rate shortens the time available for each screen update. These are approximate frame-time targets when the browser presents one animation frame per display refresh.
| Refresh rate | Approximate frame time | Typical use |
|---|---|---|
| 60 Hz | 16.67 ms | Common monitors, laptops and televisions. |
| 75 Hz | 13.33 ms | A modest smoothness improvement over 60 Hz. |
| 90 Hz | 11.11 ms | Used by some phones, tablets and modern laptops. |
| 120 Hz | 8.33 ms | High-refresh displays and premium mobile devices. |
| 144 Hz | 6.94 ms | A common gaming-monitor refresh rate. |
| 165 Hz | 6.06 ms | A common gaming refresh rate above 144 Hz. |
| 240 Hz | 4.17 ms | Very high-refresh competitive displays. |
| 360 Hz | 2.78 ms | Ultra-high-refresh competitive-gaming displays. |
Refresh Rate vs FPS
Refresh rate describes how often the display can update each second. Frames per second describes how many frames an application or game produces. They are related but are not the same measurement.
A 144 Hz screen can refresh up to approximately 144 times per second, but motion may still look uneven when an application delivers frames inconsistently or at a much lower FPS.
Refresh Rate vs Response Time
Refresh rate measures update frequency. Pixel response time describes how quickly pixels change between colours. A display can have a high refresh rate while still showing blur or ghosting if its pixel transitions are slow.
This page estimates browser frame timing. It does not measure monitor pixel response time, input lag or motion-picture response time.
When to Use a Refresh Rate Tester
Run the test after changing a monitor, cable, graphics setting, display mode or power profile, or whenever motion looks less smooth than expected.
After connecting a new monitor
Confirm that the operating system and browser are presenting near the refresh rate selected for the new display.
After changing a cable or adapter
Check whether a new HDMI, DisplayPort, USB-C cable, dock or adapter supports the intended mode.
When a high-refresh screen feels like 60 Hz
Measure the live browser rate and compare it with the display setting, graphics control panel and connection limits.
When motion stutters
Review maximum frame time, variation and possible dropped frames for signs of inconsistent browser presentation.
Browser Refresh Rate Test Accuracy
The browser does not normally expose the monitor's hardware refresh setting directly. This tool uses requestAnimationFrame timestamps and therefore measures the presentation cadence available to the current browser tab.
Results are usually close to common active display modes, but small differences can occur because of scheduling, compositing, variable refresh, background tasks and timing precision.
What This Test Cannot Measure
It cannot directly verify the monitor's internal scan frequency, panel overdrive, pixel response time, input latency, cable certification or graphics-card output signal.
It also cannot guarantee that every application runs at the measured rate. Games and video players can use separate frame limits, synchronisation settings and rendering paths.
What Refresh Rate Results Mean
Common results include approximately 60 Hz, 75 Hz, 90 Hz, 120 Hz, 144 Hz, 165 Hz and 240 Hz. Small differences are normal.
A much lower result may mean the operating system is using a lower setting, power saving is active, the cable or port is limited, or the browser is being throttled.
Refresh Rate Lower Than Expected?
Check display settings
Confirm the operating system is using the monitor's intended refresh rate.
Use the correct cable
Higher rates may require DisplayPort, HDMI 2.0, HDMI 2.1 or another compatible connection.
Disable power saving
Battery-saving modes can reduce display refresh rate or browser animation performance.
Close background activity
Games, calls, recording tools and busy tabs can disturb frame timing.
Frequently Asked Questions
Is this refresh rate test free?
Yes. It is free and requires no account, download or permission.
Is the measured refresh rate exact?
It is a browser-based estimate. Small differences from the operating-system setting are normal.
Can it detect 120 Hz or 144 Hz?
Yes, when the browser and operating system are presenting frames at those rates.
Why does my 144 Hz monitor show around 60 Hz?
The operating system may be set to 60 Hz, or the cable, adapter or browser may be limiting the rate.
Why does the result change?
Power saving, thermal limits, background apps and browser activity can change timing.
Can this test detect 165 Hz, 240 Hz or 360 Hz?
Yes. The calculation includes common high-refresh values when the operating system, connection and browser are presenting frames at those rates.
What frame time should I see at 60 Hz?
A stable 60 Hz result is approximately 16.67 milliseconds per frame. Small timing differences are normal in a browser.
What frame time should I see at 120 Hz or 144 Hz?
A 120 Hz display is approximately 8.33 milliseconds per frame, while 144 Hz is approximately 6.94 milliseconds per frame.
Does fullscreen make the result more accurate?
Fullscreen can reduce visual distractions and is useful for the motion preview, but it does not guarantee a more accurate timing result.
Can I test a phone or tablet refresh rate?
Yes. The test can run on supported mobile browsers, although mobile power saving, thermal control and dynamic refresh modes can change the result.
Can the test detect variable refresh rate?
It can show changing frame intervals, but it cannot directly confirm whether FreeSync, G-SYNC, adaptive sync or another variable-refresh technology is active.
Why is the refresh rate lower on battery power?
Many laptops, tablets and phones reduce refresh rate or browser performance in battery-saving modes to conserve energy.
Does a higher refresh rate always mean higher FPS?
No. Refresh rate is the display's update capability, while FPS is the number of frames produced by software.
Can this test measure input lag or response time?
No. Browser animation timing does not directly measure display input lag, pixel response time or end-to-end latency.
Why should I keep the tab visible?
Browsers commonly throttle animation in hidden or background tabs, which can reduce the measured frame rate and interrupt the test.
Related Device Tests
- Screen Resolution Test — Check screen size, viewport and device pixel ratio.
- Dead Pixel Test — Inspect the display using full-screen solid colours.
- Complete Device Check — Run the complete browser-based hardware checklist.
Run the Complete Device Check
Continue with screen, camera, audio, keyboard, mouse and controller diagnostics.