Tools
Frame-time and Hz calculator
Frame time is 1000 ÷ FPS milliseconds. The monitor’s trip is 1000 ÷ Hz. 144 FPS on 144 Hz is a 6.94 ms frame on a 6.94 ms refresh. If FPS is not a whole multiple of Hertz, frames do not land on the same beat each trip. A 1% low you already measured is the same invert: 1000 ÷ that FPS.
Converts a low you already have. It does not guess one.
Frame time
6.94 ms
Refresh interval
6.94 ms
Frames per refresh
1.00
Pictures the panel can show
144 /s
144 FPS sits on 144 Hz: one new frame every refresh (6.94 ms).
How the numbers line up
frame time (ms) = 1000 / FPS
refresh interval (ms) = 1000 / Hz
frames per refresh = FPS / Hz
A 60 Hz trip is 16.67 ms. A 120 Hz trip is 8.33 ms. A 144 Hz trip is 6.94 ms. A 155 Hz trip is 6.45 ms. A 240 Hz trip is 4.17 ms. Those are the same invert, not a quality score.
When FPS equals Hertz, one finished frame meets one trip. When Hertz is a whole multiple of FPS (60 FPS on 120 Hz), the same frame can be shown more than once. When FPS is a whole multiple of Hertz, extra frames finish inside one trip; a fixed-refresh panel still shows one picture per trip. When the ratio is not a whole number, the leftover fraction walks. That uneven cadence is why 144 FPS on 60 Hz does not feel like a clean 2×.
The optional 1% low field only converts a low you already measured. Type the number from the same overlay as the average. NVIDIA FrameView’s 1% Low averages the slowest 1% of frames. Other tools use a percentile or a time slice. The 1% low guide is the formula page. This tool only prints 1000 ÷ that FPS so you can see the wait next to the average.
If the pair sits on the refresh and the machine is hot, cap FPS near that Hertz. If both numbers are short of the refresh, raise FPS by giving each frame less work. Adding this frame time to refresh and mouse poll is the input-lag budget, still not a click-to-photon clock.
Common questions
How do you convert FPS to frame time?
Divide 1000 by your FPS to get frame time in milliseconds. 60 FPS is 16.67 ms, 144 FPS is 6.94 ms, and 240 FPS is 4.17 ms. The same formula turns a refresh rate in Hz into milliseconds.
What does frames per refresh mean?
It's your FPS divided by your monitor's refresh rate. A value of 1.00 means one new frame for every screen refresh. Uneven values on a fixed-refresh monitor can make motion look slightly uneven.
Do I see more frames if my FPS is higher than my refresh rate?
No. A 144 Hz monitor shows at most 144 frames a second. Extra frames can slightly lower input lag, but you won't see them as extra images.
What is the 1% low field in the frame time calculator?
It converts a 1% low FPS number from your FPS counter into milliseconds. Different tools calculate 1% lows differently, so compare it only with the average from the same tool.
Should I cap my FPS to my refresh rate?
Usually yes. Capping near your refresh rate avoids wasted frames and heat, and with G-Sync or FreeSync you should cap a few FPS below it. If your PC runs cool and you want the lowest input lag, uncapped is fine too.
Does G-Sync or FreeSync change frame time?
No, the math is the same. Variable refresh lets your monitor follow your frame rate within its range, which keeps things smooth. If your FPS leaves that range, you'll get tearing or extra delay again.
Related tools and guides
- Sensitivity converter — Convert sensitivity between Overwatch, Valorant, CS2, and other titles using documented yaw values.
- cm/360 calculator — Turn mouse DPI and in-game sensitivity into centimeters per 360° turn.
- eDPI calculator — Multiply mouse DPI by in-game sensitivity for a same-game comparison number.
- FOV converter — Convert horizontal and vertical FOV across 4:3, 16:9, 16:10, and 21:9. Includes Overwatch, CS2, and Valorant.
- Mouse polling-rate tester — Measure how often the browser sees pointer events. Average and max Hz.
- Mouse raw input test — See every mouse report as a dot, spot sensor skips, and check jitter, swipe speed, and acceleration.
- How to increase FPS — Give each frame a shorter job.
- How to cap FPS — One limiter. A few under refresh only for VRR.
- What a 1% low is — The slow tail, and why tools disagree.
- How to read an FPS counter — Average, low, and a still menu.
- How to set 144 Hz — The Hertz Windows is actually using.
- What VSync is — A wait for the next trip, not a cap.