// multi-utility computation suite · offline · instant · precise
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│ computation suite │
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cs.tcp-throughput-estimate Calculator
Estimates maximum TCP throughput from receive window size and round-trip time using the bandwidth-delay product formula. On a 100ms RTT link with a 64KB window, TCP is capped at ~5 Mbps regardless of the link bandwidth — window scaling is the fix.
Inputs
Bandwidth Mbps
Horizontal extent perpendicular to the length.
Rtt Ms
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Window Size Kb
Reference formula or conversion factor shown for context.
Packet Loss Pct
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Results
estimated TCP throughput (Mbps)
Amount of work completed per unit time — requests per second, MB/s, or transactions per second.
window-limited throughput (Mbps)
Amount of work completed per unit time — requests per second, MB/s, or transactions per second.
loss-limited throughput (Mbps)
Amount of work completed per unit time — requests per second, MB/s, or transactions per second.
bandwidth-delay product (KB)
The result of multiplying all input values together.
TCP window efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.