⚡ Hardware Refresh Cycle

Monitor Refresh Rate (Hz) Tester

Calculate your monitor's true physical refresh frequency and vertical sync interval in real time with high-resolution hardware timestamp sampling.

Detected Refresh Rate144.00 HzPanel Frequency

Frame Interval ($\Delta t$)6.94 msTime per Refresh

Samples Analyzed300Hardware Frames

Sync Confidence99.9%V-BLANK Accuracy

Why Refresh Rates Often Show Slight Fractional Offsets (e.g. 143.98Hz)

Computer displays use pixel clocks driven by quartz crystal oscillators. Video standards such as NTSC and DisplayPort often operate at fractional multipliers:

60Hz: Commonly operates at 59.94 Hz (1000 / 1001 multiplier).
120Hz: Commonly operates at 119.88 Hz.
144Hz: Commonly operates at 143.98 Hz.
240Hz: Commonly operates at 239.96 Hz.

These fractional frequencies are completely normal and indicate standard VESA timing compliant operation.

FPS Suite120Hz Check

120 FPS Verification

Verify high-refresh rate browser rendering and detect dropped frame intervals.

FPS SuiteComparison

144Hz vs 240Hz Test

Compare motion blur and clarity across high-refresh rate monitors.

Display SuiteResolution

Screen Dimensions & DPR

Instant diagnostic of screen resolution and device pixel ratio.

Hardware Knowledge Base

Frequently Asked Questions

Technical answers to common hardware, refresh rate, and browser diagnostic questions.

How does this tool detect my exact monitor refresh rate (Hz)?

Our engine synchronizes with your display's vertical hardware refresh cycle via the requestAnimationFrame API and collects hundreds of high-resolution timestamp samples to compute your exact refresh frequency down to two decimal places (e.g. 143.98 Hz or 239.96 Hz).

Why does my 144Hz monitor read 59.94 Hz or 60 Hz?

When a high-refresh monitor is connected for the first time, Windows and macOS default to 60Hz. Open your operating system display settings and manually select your maximum refresh rate.