Test your keyboard’s input lag, scan rate, and response time
Click the button below to begin your keyboard latency test
Key Press History
Total: 0What Is Keyboard Latency?
Keyboard latency is the total time delay that happens when a key press is actually pressed on the keyboard and the system starts registering it. This time delay creates keyboard input lag, also called input lag, which is usually unnoticeable during normal use. However, for specific tasks like gaming, even small delays matter a lot.
If you regularly Clean a Mechanical Keyboard, it can also help maintain consistent performance, since dust and debris may sometimes affect key response and overall typing experience.
Test Your Keyboard Latency Online (Scan Rate, Polling Rate & Input Lag)
A keyboard latency test explains keyboard latency during a key press. It shows the time taken to register proper key registration from keyboard input, revealing input lag, delay, and overall response time as an important metric for keyboard performance.
To measure latency, this latency test supports accurate latency measurement, highlighting keyboard delay and response speed. Users can check keyboard latency anytime and understand results latency now.
How to Test Keyboard Latency Online
- Follow the steps shown clearly and start the test to begin the keyboard latency test.
- Begin by pressing any key on the keyboard to check the keyboard latency in real time.
- Each action is recorded, and every key response time appears in the key press history section.
- The response time, shortest key press time, and estimated keyboard scan rate are shown on the top.
- You can scroll through the list to review data that is provided at the top of the page.
- Repeat the process anytime to check the keyboard latency again and compare results.
Features of Keyboard Latency Test
- This keyboard latency test helps accurately measure latency and keyboard scan rate in real time, making it easy to spot delays during gameplay and daily use.
- By helping you identify latency accurately, the test lets you measure latency, understand input lag, and improve overall gaming performance in the games you play.
- The detailed results allow you to finetune performance, making this tool useful for both casual users and competitive gamers.
- Before you buy new keyboard options, especially a gaming keyboard, you can use the keyboard response rate test to check keyboard response, response rate, and ensure the input lag is less than 15ms, helping with choosing better keyboard decisions.
- The tool is free to use, absolutely free, and always free for everyone, with no signup required, allowing anyone to check keyboard latency instantly and understand keyboard latency without limits.
How Keyboard Latency Works in Real Use
Keyboard latency is found by measuring how long it takes for an action on the keyboard to appear as a result on the screen. This delay starts the moment a key is pressed and ends when the typed character shows up.
To understand this better, think of the process in steps. First, the key moves down and completes its debounce process, which usually takes around 5ms. When the key returns to its position, a signal is created and sent to the computer, adding about 1ms due to the polling rate. After that, the system needs a few more milliseconds, usually 3–5ms, to display the input on the screen. When these delays are added together, they form the total keyboard latency.
Example
5ms (debounce time) + 1ms (polling rate) + 5ms (system latency) = 11ms
Why Keyboard Latency Matters (Especially for Gamers)
In a keyboard setup, latency is the small time gap between input and response, and even one millisecond of lag can be an important factor that truly matters.
During gaming, a fast game often comes down to decisive encounters, where a single button or key presses can fire, start firing, or triggers a shot in a very close moment.
If your target can move and you miss, that simple example shows how costly delay can be.
In contrast, while typing or doing regular tasks, most people never notice the delay at all.
Key Factors That Affect Keyboard Latency
1. Polling Rate
Polling rate (measured in Hertz, Hz) determines how often your keyboard reports key presses to your computer.
- A 1000Hz polling rate means the keyboard sends updates 1000 times per second.
- Some advanced gaming keyboards reach 4000Hz or even 8000Hz, offering ultra-low input lag.
2. Scan Rate
Scan rate measures how often your keyboard scans its internal circuit to detect key presses. A higher scan rate means faster key detection and fewer missed inputs.
It’s typically calculated as:
Scan Rate = Polling Rate ÷ Shortest Key Press Time
If your keyboard’s polling rate is 1000Hz and your shortest key press is 5ms, your scan rate equals 200 scans per second.
3. Response Time
Keyboard response time combines both polling and processing delays. It’s the total time from pressing a key to seeing it displayed on screen. Lower response times (below 15ms) indicate a fast, well-optimized keyboard.
4. Connection Type
Latency also depends on how your keyboard connects to your computer:
- Wired keyboards generally offer the lowest latency.
- Wireless keyboards, especially with Bluetooth, may introduce slight delays.
- 2.4GHz and 5GHz wireless keyboards provide near-wired performance.
- USB 3.0 ports reduce lag compared to older USB 2.0 connections.
Best Use Cases for the Keyboard Latency Test
🎮 Gamers optimizing reaction times
💻 Professionals seeking faster typing response
🔧 Troubleshooting faulty or unresponsive keyboards
⌨️ Comparing mechanical vs membrane performance
🧪 Benchmarking keyboard performance for reviews or setup testing
Frequently Asked Questions (FAQs)
What is the latency of a 1000Hz keyboard?
The latency of a 1000Hz keyboard depends on its polling rate and the maximum delay over the USB connection. At 125Hz, delay ranges from 0ms to 8ms delay with an average 4ms, while at 1000Hz it ranges from 0ms to 1ms delay with an average 0.5ms. The average difference in theory is about 3.5ms.
Is 100 ms keyboard latency bad?
Many people ask if 100 ms keyboard latency is noticeable. A cognitive neuroscientist who studies visual perception and cognition explains that normal human reaction time is around 200ms. From a scientific view, most latencies below 100ms are hard to feel.
How to test input latency on PC?
To test input latency on a PC, you can use tools from Nvidia, especially on their graphics cards. Even with AMD graphics, you may try Nvidia Frame View, but the PC latency metric might not appear.
Is 200ms latency good?
Whether 200ms latency is good depends on the stats used for evaluating a connection. Different values from real tests, IT industry quality standards, and basic science and math help decide this. A passable network also depends on connection type and travel distance.
How do I check keyboard latency?
To check keyboard latency, open a keyboard latency test and start pressing key inputs. The Key Press History shows each response time, including the shortest key press time and estimated keyboard scan rate. Every key response time is recorded, and you can scroll the list to review results.
Final Thoughts
Understanding and testing your keyboard latency is essential for improving productivity, accuracy, and gaming performance. Whether you’re trying to reduce input lag, choose a better keyboard, or compare scan rates, this free tool gives you instant insights.
No downloads, no sign-ups — just real-time, accurate keyboard performance testing.