Bandwidth vs. Monthly Transfer
There are a lot of promotions going on right now and this usually highlights the lack of understanding of the relationship between the bandwidth a host provides you and the amount of traffic you can actually transfer on that connection.
For example, if you are sold a 10 Mbps connection from an ISP or datacenter, the absolute theoretical maximum amount of data that you can transfer in one direction, in one month, is just over 3 TB. If you upload and download at full speed all month long, the most you can use is 6 TB (combined upload and download).
So if you’re being offered 5 TB of traffic on a 10 Mbps connection, and a huge portion of your traffic is downloads from your site, you’ll never get more than 3 TB of use out of that link.
Here’s the full run-down (in one direction, not synchronous, approximated):
1 Mbps = 320 GB/month
2 Mbps = 642 GB/month
3 Mbps = 963 GB/month
4 Mbps = 1.3 TB/month
5 Mbps = 1.6 TB/month
6 Mbps = 1.9 TB/month
7 Mbps = 2.2 TB/month
8 Mbps = 2.5 TB/month
9 Mbps = 2.8 TB/month
10 Mbps = 3.2 TB/month
15 Mbps = 4.7 TB/month
20 Mbps = 6.3 TB/month
25 Mbps = 8 TB/month
50 Mbps = 16 TB/month
75 Mbps = 24 TB/month
100 Mbps = 32 TB/month


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