Performance/ 10

TCP throughput

Estimate the window-limited throughput of a TCP connection.

Runs locally

Connection parameters

Unscaled receive window (bytes)

16-bit window field: 1–65,535 bytes.

Round-trip time (ms)

Window scale exponent

Effective window = window × 2^scale. Use 0 for no scaling.

Output unit

Theoretical throughput

Window-limited throughput: 10.4856 Mbit/s
Effective window: 65,535 bytes
Bytes per second: 1,310,700
Formula: window bytes × 2^scale × 8 ÷ RTT seconds

An upper bound from receive window and RTT only. Actual throughput also depends on congestion window, loss, bottleneck bandwidth, protocol overhead, and the application.

Window in flight64.00 KiB

Round trips / second20

Theoretical limit10.4856 Mbit/s

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