What Is Refresh Rate?

Refresh rate

A display update frequency measured in hertz (cycles per second), normally describing an available operating mode rather than a promise about frame rate.

Refresh rate is not frame rate

The display refreshes on its schedule; a game or video produces frames on another. A 144 Hz display does not force a computer to render 144 distinct frames each second. Repeated frames, uneven delivery, or synchronization behavior can all change what you see.

Connection and resolution matter too. A display may expose different refresh rates at different resolutions or through different ports. The operating system must be configured to use the desired mode; owning capable hardware is not the same as selecting it.

Hertz also tells you the refresh interval

The reciprocal of refresh rate gives the ideal time between refresh opportunities. That does not equal total input latency, but it makes the scale of the number easier to understand.

A jump from 60 to 120 Hz halves that refresh interval. A jump from 120 to 240 Hz halves it again, but the absolute reduction is smaller: about 8.3 ms becomes about 4.2 ms. This is one reason the benefit of ever-higher rates depends on the workload and the rest of the system.

When a higher number helps

More frequent updates can reduce the time between a new frame and its display, improve the apparent continuity of motion, and make pointer movement feel more responsive. The benefit is easier to notice in fast interactive content than in a static document. It can also increase power use on portable devices.

Choose by the complete workload. Check supported modes, cable and port limits, graphics performance, resolution, and power priorities instead of treating the largest hertz number as an isolated quality score.