Input Lag Calculator
Adds up the stages between a click and the screen changing.
Estimated input lag
— ms
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Where it goes
Reading this —
The formula
lag ≈ polling ÷ 2 + frames × frame time + refresh ÷ 2 + display delay
Polling and refresh are periods in milliseconds. An input arrives on average halfway through each.
What to watch out for
Change one field at a time to see which stage matters most for your setup.
Frequently Asked Questions
Does a higher refresh rate reduce lag?
Yes, within limits. Going from 60 to 144 Hz cuts the average wait from 8.33 to 3.47 ms.