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THE FEUTEX TOOLKIT

TCP Bandwidth-Delay Window

Estimate in-flight bytes and required window scale for a target path.

Networking workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaBDP=rate×RTT/8; scale=ceil(log₂(BDP/65535))
Sources and model references

How to use this tool

  1. Enter the labeled inputs in the indicated units.
  2. Calculate and compare every output against the stated model assumptions.

Try this example

{
  "rate": 100000000,
  "rtt": 0.1
}

Accuracy and scope

Steady-state ideal full-rate path; operating-system buffers, congestion and receiver behavior can limit throughput. Simplified analytical model; not a design recommendation or safety certification.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.