120 vs 240 FPS — See the Difference Side by Side
The same disc, moving at the same speed, at 120 FPS and at 240 FPS — plus your own display's full rate for reference. No charts of other people's opinions: your eyes, your screen.
The meter starts automatically — no button needed. Keep this tab in front for a clean reading.
Your system (read locally, never uploaded)
Benchmark history
120 vs 240 FPS: what actually changes
From 8.3 to 4.2 milliseconds per frame: the absolute saving is now smaller than the 30-to-60 jump's leftovers, and honesty requires saying many players cannot identify 240 in a blind test on slow content. Where it does show up is fast tracking — a flick across the screen in a shooter, where the 240 lane keeps the target legible a beat longer — and in input delay, where every saved millisecond is a larger share of a shrinking total. Competitive players buy it for that edge; everyone else should try the lanes and let their own eyes vote.
| Rate | Frame time | Frames per second |
|---|---|---|
| 120 FPS | 8.33 ms | 120 |
| 240 FPS | 4.17 ms | 240 |
| Difference | 4.17 ms saved per frame | 120 more frames |
One rule governs everything on this page: a display can only show as many frames as it refreshes. If your monitor runs at 120Hz, the 240 FPS lane above is being capped to 120 by your screen itself and the two will look the same — run the refresh rate test to see your true rate before concluding anything about your eyes. And if you are deciding where upgrade money goes, pair this page with the FPS calculator: the monitor only helps if your hardware can feed it, in the games you actually play.
How to compare honestly
- Track the disc with your eyes rather than staring at the screen — motion clarity differences live in tracked movement.
- Use the Fast lane speed: differences widen as speed rises, which mirrors fast camera movement in games.
- Compare the top pair, then compare each against the Your Rate lane to place your own display on the ladder.
- Re-run on any other display you own — a phone with a high-refresh screen often shows the gap a desktop monitor cannot.
Frequently asked questions
Can you see the difference between 120 and 240 FPS?
On a display that can show both rates, most people can — the lanes on this page run both side by side so you can judge with your own eyes. Remember the ceiling rule: on a 120Hz screen the 240 lane is capped and will look identical, which is a property of your monitor, not of your eyesight.
How much frame time do I save going from 120 to 240 FPS?
Each frame lasts 8.3 ms at 120 FPS and 4.2 ms at 240 FPS — a saving of 4.2 ms per frame. Smaller savings at higher rates are why each step up the ladder feels less dramatic than the last.
Do I need a new monitor for 240 FPS?
Yes, if yours tops out below 240Hz: a display can never show more frames than it refreshes. Check what yours is actually running at with the refresh rate test before spending anything — a surprising number of high-refresh monitors are still set to 60Hz.
Does higher FPS reduce input lag?
Yes, modestly: a new frame is the earliest moment your input can become visible, so shorter frames shrink the average wait. It is one component of total lag alongside device polling, rendering and display processing.