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Banners By The Ad-Network
If you are developing virtual
products this calculator will be a great asset. Use this calculator to
calculate download times for your audio, ebooks, programs or anything else
you plan to
offer for site
visitors to download. You will notice the "Overhead" option. Overhead is very fluid and changes
from time to time and server to server. We have found using
at least 25% Overhead in our calculations produces pretty realistic download times. There
is more information about overhead at the bottom of this
page.
Calculate Download Times
KByte = Kilobyte
MByte =
Megabyte
GByte = Gigabyte
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Kbps = Kilobit per second
Mbps = Megabit per second
Gbps = Gigabit per second
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Your actual transfer speeds will likely be a
bit slower than the calculator shows. Why? Because on a normal
Internet connection your transfer speed is decreased by:
- Variable speed quality influenced by latency and jitter.
- Physical signaling overhead (e.g.
The advertised transfer speed of a T1 line is 1,536 Kbps however 192
Kbps is usually tied up in the T1 line signaling protocol so the best
you'll ever get is 1,344 Kbps)
- Layer 4 transport and
transmission protocol maintainence/overhead. Amazingly, these
below processes can eat up to 10% of your transfer
speed.
- Handshaking negotiation procedures
between you and the place you are transferring the file such as "slow start" described technically in RFC 2001.
- TCP overhead, error
checking and sending of protocol headers (e.g. Each IPv4 header is 160 bits, each UDP header
is 64 bits, etc. )
- If you are not transferring files over the
Internet (TCP/IP) then these things will impact you less.
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