Network Speed time = size of file (in bits) / network speed (in bits). Network speed is measured is Mbps and Gbps: 1 Megabit per second = 1 Mbps = 1,000,000 bits per second 1 Gigabit per second = 1 Gbps = 1,000,000,000 bits per second If you know the file size to be transferred AND the network speed in Mbps or Gbps, you can work out how long it takes to transfer a file. Let’s see how long it would take to transmit a 5KB file over a network with a speed of 10 Mbps. You will need to convert both into a common unit (bits) before using the formula. time = size of file (in bits) / network speed (in bits). time = (5KB in bits) / (10Mbps in bits) time = (5*8*1024) / (10 * 1,000,000) time = (40960 bits) / (10,000,000 bits) time = 0.004096 seconds