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How many GB is 1Mbps?
The MATHEMATICAL maximum transfer of 1Mbps full duplex (megabit per second, or Mb/s) is roughly 320 gigabytes per month in each direction (320GB in and 320GB out). This is calculated from the number of seconds in a 30-day month multiplied by the number of bits in a megabit.
The REAL WORLD USAGE value of 1Mbps is much less than the mathematical value. Since it is based on several variables, it is impossible to state what your real use could be.
When calculating Mbps from GB, never use the 316GB value as it will almost never be anywhere near accurate. Always consider a conservative number such as 150-200GB per 1mbps outbound, as this is what the typical end-user's usage of bandwidth equates to.