Input Lag Calculator
Calculate total system latency from peripherals to display output
Set Your Refresh Rate
Select your monitor’s refresh rate. Higher refresh rates like 144Hz or 240Hz reduce frame time and overall latency.
Enter Monitor Input Lag
Check your monitor’s specs or reviews for input lag. Gaming monitors typically have 1-5ms, while regular monitors may have 10-20ms.
Select USB Polling Rate
Choose your mouse/keyboard polling rate. 1000Hz is standard for gaming peripherals. Higher rates like 8000Hz reduce input latency further.
Estimate Render Latency
1 frame is ideal with unlimited FPS. V-Sync adds 1-2 frames. Heavy GPU load or frame limiting increases render queue.
What is Input Lag?
Total time from your physical input (mouse click, key press) to the result appearing on screen. Includes peripheral, PC processing, and display latency.
Frame Time Impact
At 60Hz, each frame takes 16.67ms. At 240Hz, it’s only 4.17ms. Higher refresh rates significantly reduce this component.
V-Sync and Latency
Traditional V-Sync adds 1-3 frames of latency. Use G-Sync/FreeSync or NVIDIA Reflex to minimize input lag while avoiding tearing.
Competitive Standards
Pro esports players aim for under 20ms total latency. Casual gaming is comfortable under 50ms. Above 100ms becomes noticeable.