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Step 1
Determine your bandwidth in bits per second. Use the link in the Resources section to easily make the conversion. Write this number down.
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Step 2
Calculate your latency. To do this, open your command window. Type "cmd" in Windows to locate this window. On the command window, type "tracert www.google.com" without quotation marks. Hit enter; write down the times displayed in milliseconds. Determine the average time by adding all the time. Divide the sum by the number of times recorded.
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Step 3
Determine your TCP Window size by multiplying your latency and bandwidth together. For example, a bandwidth speed of 50 megabytes (converted to 419430400 bits) multiplied by a latency of 20 milliseconds (converted to .020 seconds) yields a TCP Window size of 8,388,608 bits.
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Step 4
Divide your TCP Window size by your latency to determine the throughput in bits. Using the information above, the TCP Windows size of 8388608 divided by .020 seconds yields a throughput of 419430400 bits per second.
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Step 5
Convert your throughput to megabytes per second by multiplying your bits by (1.1920929 --- 10^-7) or using a conversion calculator (provided in the Resources section). The result is your throughput in megabytes per second.
