Convert between port speed and monthly data transfer, and work out how long a file takes to send at a given speed.
How to Use
Speed to monthly data, monthly data to speed, or transfer time.
Units can be switched between Mbps and Gbps, GB and TB.
Results update as you type, with the working shown.
Servers & Hosting
Network speeds are in bits per second; file and data allowances are in bytes. There are 8 bits in a byte, so a 100 Mbps link moves at most 12.5 megabytes per second. This calculator uses decimal units, as networks and most hosting providers do: 1 TB is 1,000 GB.
A link running flat out for a 30-day month moves: 1 Mbps ≈ 0.32 TB, 100 Mbps ≈ 32.4 TB, 1 Gbps ≈ 324 TB, 10 Gbps ≈ 3.24 PB.
Data centres usually bill bandwidth by the 95th percentile: they sample usage every 5 minutes, drop the top 5% of samples and bill the highest remaining one. Short bursts (up to about 36 hours a month) are free. A server that averages 50 Mbps but spikes to 900 Mbps for an hour a day is billed near 50 Mbps.
Monthly data allowances, as most VPS plans use, count every byte instead. Use the monthly figures here to see what a port speed can actually move.
Free Tools
Frabs shows every VM's outbound traffic live and stops floods before they fill your uplink.