Display calculator
Display Bandwidth Calculator
Pixel clock, active data rate, encoded link rate, and per-lane bandwidth.
Display link bandwidth
Calculate pixel clock, active payload rate, encoded link rate, and per-lane rate.
- Pixel clock
- 522.55 MHz
- Active rate
- 12.54 Gbps
- Link rate
- 12.93 Gbps
- Per lane
- 3.23 Gbps
Use exact timing totals from a panel datasheet when available.
Formula notes
Pixel clock starts with active pixels, refresh rate, and blanking overhead. Active bandwidth multiplies pixel clock by bits per pixel. Encoded bandwidth then applies the selected link coding overhead.
What this calculator is for
Use this display bandwidth calculator to estimate whether a resolution, refresh rate, color depth, and lane count can fit through a display link. It helps with monitor bandwidth checks, DisplayPort and HDMI planning, embedded panel bring-up, and quick comparisons between active payload, encoded link rate, and per-lane rate.
The result is an engineering estimate. For a production design, replace the blanking percentage with exact timing totals from the panel datasheet or video timing standard, then compare the per-lane rate against the source PHY, cable, connector, retimer, and sink device limits.
Key parameters
- Resolution: active horizontal and vertical pixels.
- Refresh rate: frames per second, including fractional rates when needed.
- Bits per color: 8-bit, 10-bit, or higher color depth before any compression.
- Blanking overhead: extra timing outside the active image.
- Encoding overhead: line coding such as 8b/10b or 128b/132b.
- Lanes: the number of parallel lanes carrying the encoded link.
Common resolution examples
A 1080p60 8-bit RGB signal is modest for modern links. A 1440p144 signal is already a serious monitor bandwidth
case. 4K60 8-bit RGB is about 12 Gbps of active payload before overhead, while 4K120 or 4K144 10-bit
modes can require compression or newer interface standards depending on blanking and link encoding.
How to compare results with a datasheet
Start by matching units. Panel datasheets often list a pixel clock in MHz, interface documents often list aggregate link bandwidth in Gbps, and PHY datasheets often list per-lane rate. These are different layers of the same path. If a datasheet gives horizontal total and vertical total timing, use those values instead of a percentage blanking estimate. If it only gives active resolution and refresh rate, keep a margin before assuming the interface has enough headroom.
Embedded display links also need board-level margin. Cable loss, connector choice, retimer settings, trace length, lane skew, and sink equalization can prevent a link from training even when the theoretical bandwidth looks valid. Treat the calculator as the first pass, then verify the negotiated mode and error counters on the real hardware. Leave extra margin when the product must work across multiple cable vendors.
Compressed links
This calculator estimates uncompressed payload and simple link encoding overhead. Display Stream Compression, chroma subsampling, spread-spectrum clocking, and protocol packet overhead need separate link-specific checks.
DisplayPort, HDMI, and cable checks
Do not compare only the marketing version number. Check the effective bandwidth mode that is actually negotiated: for example, HDMI FRL lane rate, DisplayPort HBR or UHBR mode, cable certification, and whether DSC is enabled. A display cable bandwidth calculator is most useful when the source, cable, dock, adapter, and monitor are all treated as one link budget.
Before comparing link limits
- Use exact total timing from the panel datasheet when it is available.
- Compare per-lane rate with the PHY, cable, connector, and sink device limits.
- Check whether the real path uses DSC, reduced blanking, or chroma subsampling.
Frequently asked questions
How do I calculate display bandwidth?
Multiply pixel clock by bits per pixel, then apply the link encoding overhead. Pixel clock comes from resolution, refresh rate, and blanking. For RGB or 4:4:4 video, bits per pixel is three color channels times bits per color.
How much bandwidth does 4K 60 Hz need?
A 3840 x 2160 display at 60 Hz and 8 bits per color needs about 12 Gbps of active RGB payload before blanking and link encoding. With blanking and encoding overhead, the required link rate is higher, so exact timing and interface mode matter.
Is DisplayPort or HDMI better for high refresh rates?
It depends on the version and cable certification. HDMI 2.1 and DisplayPort 1.4 with DSC can both handle many 4K high-refresh modes. DisplayPort 2.x provides more headroom for very high resolutions or refresh rates, but the source, cable, and monitor must all support the same mode.
What is per-lane display bandwidth?
Per-lane bandwidth is the encoded aggregate link rate divided by the number of active lanes. It matters for DisplayPort, embedded DisplayPort, MIPI-style links, and other multi-lane PHYs where each lane has its own maximum data rate.
Does DSC or chroma subsampling change the result?
Yes. Display Stream Compression reduces the required link payload after compression, and chroma subsampling reduces color data. This calculator estimates uncompressed RGB-style payload plus simple encoding overhead, so use separate link-specific checks when DSC or YCbCr 4:2:2 / 4:2:0 is enabled.