TCP Window Size Calculator
Calculate the TCP receive window needed to fully use a network path, based on bandwidth and round-trip time.
Formula: TCP Window Size = Bandwidth × Round-Trip Time (Bandwidth-Delay Product)
Calculation Results
How to use this calculator
Required Window: Enter the link bandwidth and RTT to calculate the minimum TCP receive window needed to keep the connection fully utilized.
Maximum Throughput: Enter an existing TCP window and RTT to estimate the maximum theoretical throughput.
Actual performance may be lower because of packet loss, congestion control, protocol overhead, server limits, and operating-system tuning.
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