Calculator Form
Formula Used
Pixels per frame = Width × Height
Pixels per second = Width × Height × Refresh rate
Frame time = 1000 ÷ Refresh rate
Pixel clock = Pixels per second × Blanking factor
Raw bandwidth = Pixels per second × Bits per pixel × Chroma factor × Blanking factor
Effective bandwidth = Raw bandwidth ÷ Compression ratio
Cable usage = Effective bandwidth ÷ Cable limit × 100
How to Use This Calculator
Enter the screen width and height in pixels.
Add the refresh rate in hertz.
Select the color depth and chroma format.
Enter blanking overhead if timing overhead is known.
Use compression ratio when display stream compression is applied.
Enter your cable or interface bandwidth limit.
Press Calculate to view timing and bandwidth results.
Use the CSV or PDF button to save results.
Example Data Table
| Resolution | Refresh | Color Depth | Chroma | Blanking | Compression | Approx Result |
|---|---|---|---|---|---|---|
| 1920 × 1080 | 60 Hz | 24 bpp | 4:4:4 | 5% | 1:1 | About 3.14 Gbps |
| 2560 × 1440 | 144 Hz | 24 bpp | 4:4:4 | 5% | 1:1 | About 13.38 Gbps |
| 3840 × 2160 | 144 Hz | 30 bpp | 4:4:4 | 5% | 1:1 | About 37.62 Gbps |
| 7680 × 4320 | 60 Hz | 30 bpp | 4:2:0 | 5% | 3:1 | About 10.45 Gbps |
Resolution Refresh Rate Guide
Why Display Bandwidth Matters
A resolution refresh rate calculator helps estimate the signal load created by a display. Every frame contains pixels. A higher resolution adds more pixels per frame. A higher refresh rate sends more frames each second. Together, these values decide how much data must move through the cable, graphics card, dock, or capture device.
Understanding The Main Inputs
Width and height describe the active image area. Refresh rate describes how many times the image updates per second. Color depth controls the number of bits used for each pixel. Higher color depth can improve gradients and HDR quality, but it also raises bandwidth. Chroma format changes how color detail is sampled. Full 4:4:4 sampling keeps complete color information. Reduced formats lower the data rate for video use.
Pixel Clock And Timing
The pixel clock estimates how fast pixel data must be transmitted. Real video signals often include timing overhead. This overhead is called blanking. It adds extra data beyond the visible pixels. Modern reduced blanking modes can lower this extra load. Older timing modes may need more overhead. The calculator lets you set blanking as a percentage.
Compression And Interface Limits
Compression can reduce the final bandwidth requirement. Display stream compression is often used for high resolution and high refresh displays. A compression ratio of one means no compression. A ratio of three means the raw signal is reduced to one third. The cable limit field helps compare the final result with an available interface limit.
Using Results For Planning
The pass or fail status gives a quick planning check. Pixel clock helps with timing review. Frame time shows how long one frame remains on screen. Data rate helps compare displays, capture cards, and cables. Headroom shows how much bandwidth remains after the selected mode. Always use manufacturer specifications for final hardware choices.
FAQs
What does this calculator measure?
It estimates pixel clock, frame timing, raw bandwidth, effective bandwidth, and cable usage for a chosen display mode.
Why does refresh rate affect bandwidth?
A higher refresh rate sends more frames every second. More frames require more pixel data, so bandwidth rises quickly.
What is pixel clock?
Pixel clock is the estimated rate used to transmit pixels. It includes active pixels and optional timing overhead.
What is blanking overhead?
Blanking overhead represents timing data outside the visible image. It can vary by timing standard and display mode.
How does color depth change the result?
Higher color depth uses more bits per pixel. This increases bandwidth and may require a stronger interface.
What does chroma format mean?
Chroma format describes color sampling. Full 4:4:4 keeps more detail. Reduced formats lower bandwidth for video.
What is compression ratio?
Compression ratio reduces the calculated raw data rate. A higher ratio lowers the effective bandwidth requirement.
Can this confirm cable compatibility?
It gives a useful estimate. Final compatibility should still be checked against cable, port, monitor, and device specifications.