Monitor Refresh Rate vs Response Time: What’s the Difference?

This article explains the difference between a monitor’s refresh rate and its response time, two specs that are often confused but affect your display experience in very different ways. Refresh rate (measured in Hz) is how often the screen updates the image per second, while response time (measured in ms) is how quickly a pixel changes color. You’ll learn what each number means, how they impact gaming and everyday use, and which one matters more for your needs.

Formula

The calculator above computes two related values from a total time and a frame count. The first output, average frame rate (fps), is the number of frames per second: fps = f / (t / 60), where f is the number of frames and t is the total time in minutes. The second output, time per frame (ms), is the inverse: rt = (t * 1000) / f, giving the average time each frame is displayed in milliseconds. For example, if a game renders 120 frames in 60 seconds, the average frame rate is 2 fps and each frame lasts 500 ms.

Worked Example

Using the default values: total time = 60 minutes, frames = 120. First, convert minutes to seconds: 60 min × 60 s/min = 3600 s. Then average frame rate = 120 / 3600 = 0.0333 fps (rounded to 0.0 with 1 decimal). Time per frame = 3600 s / 120 = 30 s = 30000 ms, which is 30000.00 ms. The calculator’s first output shows 0.0 fps and the second shows 30000.00 ms.

What Is Refresh Rate?

Refresh rate is the number of times per second your monitor redraws the entire image. It is measured in hertz (Hz). A 60 Hz display refreshes 60 times per second, a 144 Hz display refreshes 144 times per second, and so on. This determines how smoothly motion appears, especially during fast panning or quick movements in games. Higher refresh rates reduce motion blur and make the image feel more fluid. The refresh rate is a property of the monitor itself, but the actual frame rate your graphics card sends also matters. If your GPU produces 100 fps on a 144 Hz monitor, the monitor can only show 100 unique frames per second, but it still refreshes 144 times, repeating some frames.

What Is Response Time?

Response time is the time it takes for a pixel to change from one color to another, typically measured in milliseconds (ms). It is usually specified as the transition from gray to gray (GtG), which is the most common measurement. A lower response time means faster pixel transitions, which reduces ghosting or trailing artifacts behind moving objects. For example, a 1 ms response time is generally considered excellent for fast-paced gaming, while 5 ms is common on many IPS panels and is fine for most users. Response time is a physical property of the LCD panel (or OLED), and it is independent of refresh rate. You can have a 60 Hz monitor with a 1 ms response time, or a 240 Hz monitor with a 4 ms response time—though in practice, high-refresh monitors usually have fast response times to match.

How They Work Together

Refresh rate and response time are related but not interchangeable. Refresh rate determines how often the screen updates, while response time determines how quickly each pixel can change to the new image. If the response time is too slow relative to the refresh rate, the pixel may not finish changing before the next refresh occurs, causing ghosting. For example, on a 144 Hz monitor, each refresh happens every 6.94 ms (1000/144). If the response time is 10 ms, the pixel is still transitioning when the next frame arrives, leading to visible trails. Ideally, response time should be less than the frame interval: for 60 Hz, under 16.67 ms; for 144 Hz, under 6.94 ms; for 240 Hz, under 4.17 ms. However, response time specs are often marketing numbers, so real-world performance varies.

Which Matters More for Gaming?

For competitive gaming, refresh rate often has a bigger impact on perceived smoothness and input lag. Going from 60 Hz to 144 Hz is a dramatic improvement in motion clarity. Response time matters too, but the difference between 1 ms and 5 ms is hard to notice for most people, whereas the jump from 60 to 144 Hz is obvious. For casual gaming and general use, a 60 Hz monitor with a 5 ms response time is perfectly adequate. If you play fast-paced shooters or racing games, prioritize a higher refresh rate (144 Hz or more) and a response time of 5 ms or lower. For content creation, response time is less critical, but a high refresh rate can make scrolling and window dragging feel smoother.

Common Misconceptions

One common myth is that a higher refresh rate automatically reduces response time. That is not true—they are independent specs. Another misconception is that response time is the same as input lag. Input lag is the delay between your mouse click and the screen updating, which involves the monitor’s electronics and the GPU, not just pixel transition. Response time is only one component of input lag. Also, many manufacturers list

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in t | Total time | min | 60 | 0
in f | Frames in that time | - | 120 | 1
out fps | Average frame rate | fps | f / (t / 60) | 1
out rt | Time per frame | ms | (t * 1000) / f | 2