How do I calculate the network bandwidth















Netzmafia network calculators

Preliminary remark: In the technical field, the bandwidth was initially mainly used to identify the width of a frequency band. In the meantime, bandwidth is also applied to data transmission rates and here too often in the meaning of "maximum data rate" because the lower limit value is usually 0. The following "calculators" allow various calculations and conversions relating to bandwidth, throughput, speed and subnets.


  • FCS = Frame Check Sum = check information for a frame
  • 1The frame size must be between 64 and 1518 bytes (normal Ethernet frames) or between 64 and 1522 bytes (VLAN tagged frames)!
  • 2The effective bandwidth (Bw) is calculated as follows:
    Total bandwidth - (Preamble Bw + Inter Frame Gap Bw + FCS Bw + Ethernet Headers Bw).
  • 31 month = 30 days

The overhead for Ethernet II is a maximum of 42 bytes, which are composed as follows:

  • 12 bytes Inter Frame GAP (minimum distance between two consecutive frames)
  • 7 bytes preamble
  • 1 byte start frame delimiter
  • 6 bytes destination MAC address
  • 6 bytes source MAC address
  • 2 bytes type field
  • 4 bytes VLAN tag field (optional)
  • 4 bytes frame check sum (FCS)

Bandwidth calculator

Conversion of speed information. Any units such as KBit / s can be converted into other units such as MByte / day. In the network in particular, you often miscalculate because the speed in bit per unit of time, but the size of files and disks in byte.

Unit bit
Kbit1000 bits
Mbit1000 kBit
GBit1000 Mbit
TBit1000 GBit
PBit1000 Tbit
Unit byte (decimal)
Kilobytes (kB)1000 bytes
Megabytes (MB)1,000,000 bytes
Gigabytes (GB)1,000,000,000 bytes
Terabytes (TB)1,000,000,000,000 bytes
Peta (PB)1,000,000,000,000,000 bytes
Unit byte (binary)
Kibibyte (KiB)1024 bytes
Mebibyte (MiB)1,048,576 bytes
Gibibyte (GiB)1,073,741,824 bytes
Tebibyte (TiB)1,099,511,627,776 bytes
Pebibyte (PiB)1,125,899,906,842,624 bytes