Refresh rate is usually advertised in Hz — 60Hz, 144Hz, 240Hz — but the number that actually determines how responsive a display feels is frame time: how many milliseconds pass between each refresh. This calculator converts between Hz and milliseconds per frame, so you can see exactly how much time a higher refresh rate saves you.
What the Result Means
The frame time result tells you how many milliseconds elapse between each screen refresh at a given Hz. A lower frame time means the display updates more frequently, showing motion more smoothly and reducing the delay between something happening on your PC and it appearing on screen. A higher frame time means fewer updates per second, which can make fast motion look more like a series of jumps rather than fluid movement, and adds a small amount of extra delay to what you see.
This matters most for gaming, especially competitive or fast-paced games, where lower input lag and smoother motion can translate into noticing enemy movement sooner or landing a shot more consistently. It’s less critical for everyday tasks like browsing or document work, where the difference between 60Hz and 144Hz is far less noticeable.
How This Calculator Works
Refresh rate and frame time are reciprocals of each other:
Frame time (ms) = 1000 ÷ refresh rate (Hz)
And the reverse: refresh rate (Hz) = 1000 ÷ frame time (ms). The calculator takes whichever value you enter and computes the other directly using this relationship.
Worked example: At 60Hz, frame time = 1000 ÷ 60 ≈ 16.7 milliseconds between refreshes. At 144Hz, frame time = 1000 ÷ 144 ≈ 6.9 milliseconds. At 240Hz, frame time = 1000 ÷ 240 ≈ 4.2 milliseconds. Going from 60Hz to 144Hz cuts nearly 10 milliseconds off the delay between refreshes — a meaningful reduction for fast-moving content — while going from 144Hz to 240Hz saves a smaller, though still real, 2.7 milliseconds. This is why the jump from 60Hz to 144Hz tends to feel like the bigger upgrade, and returns diminish somewhat at higher Hz tiers.
Important Limitations
Refresh rate is only one piece of what makes a display feel responsive. Total input lag also depends on the monitor’s response time (how fast individual pixels actually change color), the game engine’s rendering pipeline, your GPU’s frame rate output, and whether features like V-Sync or frame-pacing are enabled — none of which this calculator measures. A high refresh rate monitor paired with a GPU that can’t reach that frame rate in a given game won’t deliver the full benefit, since the display can only refresh as fast as new frames are actually available to show.
It’s also worth noting that a monitor’s maximum refresh rate is a hardware ceiling, not a guarantee — actual in-game responsiveness depends on your system consistently producing frames at or above that rate. Check the FPS Calculator if you want to estimate whether your hardware can actually reach the frame rates a given refresh rate can display.
Frequently Asked Questions
Is 144Hz noticeably better than 60Hz?
Yes, for most people — 144Hz cuts frame time from about 16.7ms down to about 6.9ms, which is a large enough difference that motion looks visibly smoother and input feels more responsive, especially in fast-paced games. The difference is far less noticeable for everyday tasks like web browsing.
Does refresh rate alone determine input lag?
No — refresh rate sets an upper bound on how often the display can update, but total input lag also depends on your GPU’s actual frame rate, the monitor’s pixel response time, and rendering settings like V-Sync. A high refresh rate monitor still needs a system that can keep up with it to deliver its full benefit.
Do I need 240Hz for competitive gaming?
Not necessarily. The jump from 60Hz to 144Hz produces the largest reduction in frame time and is the upgrade most people notice most clearly. Going from 144Hz to 240Hz still helps but delivers a smaller, more incremental improvement — worth it for some competitive players, less essential for casual play.
What refresh rate does a movie or TV show need?
Most video content is filmed at 24, 30, or 60 frames per second, so a standard 60Hz display can show it without issue. Higher refresh rates mainly benefit interactive content like games and fast mouse or camera movement, rather than pre-recorded video.