PCI Lane Calculator

Use this tool to calculate the transfer rate per lane in Megabytes per second or Gigabytes per second.



  • Transfer Rate
  • Encoding scheme (select one of two options)
  • Number of lanes

The tool provides the raw transfer rate per lane and for all lanes combined



Example Calculation

For a transfer rate of 16 GT/s (PCIe version 4.0), and 128b/130b encoding, the calculator gives the throughput value of 1.969 GB/s per lane. For 16 lanes this gives 31.508 GB/s.


To calculate the transfer rate of a PCI Express (PCIe) connection, you need to know the following

  1. Transfer rate
  2. Number of lanes: Min 1 and Max 16. This indicates how many parallel paths of communication are available.
  3. Encoding overhead: PCIe uses an 8b/10b encoding scheme for versions 1.x and 2.x (which introduces a 20% overhead). A more efficient 128b/130b scheme is used for versions 3.0 and above (1.5% overhead). Version 6.0 and higher uses the most efficient 1b/1b scheme.

Use the PCIe bandwidth calculator to find the transfer time depending on the number of lanes and version number.

Wikipedia References

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