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      Thursday, 09-Dec-2021 03:28:03 Central Standard Time

CableNut Tools
Rwin Calculator
Bandwidth:  Help
Latency:      Help
MSS:              Help



CableNut's TCP RWIN calculator will give you the most optimal TCP RWIN for your connection, and your connection only. If you need help on what each of the above values mean click the help link next to them. Once you have calculated your optimal RWIN, you can enter it into the CableNut Adjuster.

In the Windows 9x Adjuster:

In the Windows NT/2000/XP Adjuster:

Enter the number you calculated, and click Save to Registry. Reboot your machine for changes to take affect.
Bps Calculator
   kBps calculator beta

Enter a number and click "Bytes" or "Bits":


Bps (bytes per second)
bps (bits per second)
modem speed (Mbps)

  • Translation to "Modem Speed" is done by assuming
    8 bits per byte. Most modems use 9 bits to transmit
    a byte (8 bits, no parity, 1 stopbit).
  • The "kilo" in "kilobit per second" stands for
    1000, not 1024 as is customary when describing
    memory and harddisk size.

  • 1 bit (b) = 0 or 1 = one binary digit
  • 1 kilobit ( kb) = 10^3 bits = 1,000 bits
  • 1 Megabit (Mb) = 10^6 bits = 1,000,000 bits
  • 1 Gigabit (Gb) = 10^9 bits = 1,000,000,000 bits

    1 megabits
    bits 1048576
    bytes 131072
    kilobits 1024
    kilobytes 128
    megabits 1
    megabytes 0.125
    gigabits 0.0009765625
    gigabytes 0.0001220703125

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