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FPS and Frame Time Calculator
See what a higher frame rate or refresh rate really changes, in milliseconds, and check whether your game is stuttering.
Compare two frame rates
Check for stutter
Frame time at common refresh rates
| FPS or Hz | Frame time | Faster than 60 FPS by |
|---|---|---|
| 30 | 33.3 ms | slower |
| 60 | 16.7 ms | — |
| 75 | 13.3 ms | 3.3 ms |
| 120 | 8.3 ms | 8.3 ms |
| 144 | 6.9 ms | 9.7 ms |
| 165 | 6.1 ms | 10.6 ms |
| 240 | 4.2 ms | 12.5 ms |
| 360 | 2.8 ms | 13.9 ms |
| 480 | 2.1 ms | 14.6 ms |
How to read the numbers
Frame time is 1000 divided by frames per second. Each step up in frame rate saves fewer milliseconds than the last, which is why 60 to 144 feels like a big change and 240 to 360 feels much smaller. Frame time is only one part of the delay between your hand and the screen, so treat these numbers as the part your GPU and monitor control, not the full input lag.
For stutter, a smaller gap between your average and your 1% low means smoother play. The guide below is a rule of thumb rather than a fixed standard.
- 1% low at 75% of average or higher: smooth.
- 50 to 75%: some stutter in busy scenes.
- Below 50%: noticeable stutter worth fixing.
Frequently asked questions
What is frame time?
Frame time is how long each frame stays on screen, in milliseconds. It is 1000 divided by your frame rate. At 60 FPS each frame lasts about 16.7 ms, and at 144 FPS about 6.9 ms.
Is 240 Hz worth it over 144 Hz?
Going from 144 to 240 saves about 2.8 ms per frame. Going from 60 to 144 saves about 9.7 ms. The gains get smaller as the numbers go up, so the jump from 60 to 144 is the one most people notice. Higher refresh rates matter most in fast competitive shooters, and only if your PC can actually reach those frame rates.
Does frame time equal input lag?
No. Frame time is only one part of the delay between moving your mouse and seeing it on screen. The full delay also includes your mouse, the game itself and the monitor's processing. Lower frame time helps, but it is not the whole number.
Does FPS above my refresh rate help?
With V-Sync off, frames above your refresh rate can make the newest image a little more up to date, but your monitor still only shows as many images per second as its refresh rate. You may also see screen tearing. Many players cap FPS just below their refresh rate and use G-Sync or FreeSync for a smooth picture.
What are 1% lows?
The 1% low is the frame rate of your slowest 1% of frames. It shows stutter that an average hides. A game that averages 140 FPS but has 1% lows of 60 can feel worse than a steady 100 FPS.
Low FPS? Use the bottleneck calculator to find what limits you, or the monitor calculator to compare screens.