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The Metric System and Computing
a How Many Bytes for Anything
a How Many Bytes for a Web Site
a How Much Information Is Produced
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The Metric System and Computing |
Abbreviation |
Equivalent |
| Byte |
B |
1 |
| Kilobyte |
KB |
1000 B |
| Megabyte |
MB |
1000 KB |
| Gigabyte |
GB |
1000 MB |
| Terabyte |
TB |
1000 GB |
| Petabyte |
PB |
1000 TB |
| Exabyte |
EB |
1000 PB |
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| How Many Bytes for Anything |
How Many Bytes |
In Bytes |
| A binary decision |
1 bit |
1 |
| A single text character |
1 byte |
1 |
| A typical text word |
10 bytes |
10 |
| A typewritten page |
2 kilobytes |
2,000 |
| A low-resolution photograph |
100 kilobytes |
100,000 |
| A short novel |
1 megabyte |
1,000,000 |
| The contents of a 3.5 inch
floppy disk |
1.44 megabytes |
1,440,000 |
| A high-resolution photograph |
2 megabytes |
2,000,000 |
| The complete works of
Shakespeare |
5 megabytes |
5,000,000 |
| A minute of high-fidelity sound |
10 megabytes |
10,000,000 |
| One meter (or close to a yard)
of shelved books |
100 megabytes |
100,000,000 |
| The contents of a CD-ROM |
500 megabytes |
500,000,000 |
| A pickup truck filled with books |
1 gigabyte |
1,000,000,000 |
| The contents of a DVD |
4.7 gigabytes |
4,700,000,000 |
| A collection of the works of
Beethoven |
20 gigabytes |
20,000,000,000 |
| A library floor of academic
journals |
100 gigabytes |
100,000,000,000 |
| 50,000 trees made into paper and
printed |
1 terabyte |
1,000,000,000,000 |
| An academic research library |
2 terabytes |
2,000,000,000,000 |
| The print collections of the
U.S. Library of Congress |
10 terabytes |
10,000,000,000,000 |
| The National Climactic Data
Center database |
400 terabytes |
400,000,000,000,000 |
| Three years' of
EOS data (2001) |
1 petabyte |
1,000,000,000,000,000 |
| All U.S. academic research
libraries |
2 petabytes |
2,000,000,000,000,000 |
| All hard disk capacity developed
in 1995 |
20 petabytes |
20,000,000,000,000,000 |
| All printed material in the
world |
200 petabytes |
200,000,000,000,000,000 |
| Total volume of information
generated in 1999 |
2 exabytes |
2,000,000,000,000,000,000 |
| All words ever spoken by human
beings |
5 exabytes |
5,000,000,000,000,000,000 |
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How Many Bytes for a Web Site |
How Many Bytes |
In Bytes |
| The amount of text on an average
print page (converted into HTML) |
1 kilobyte |
1,000 |
| A button-size image for a Web
page |
1 KB to 5 KB |
1,000 |
| A larger image for a Web page |
30 to 60 KB+ |
30,000 |
| An average Web site |
5 megabytes |
5,000,000 |
| The range for typical PDF files |
100 to 800 KB |
100,000 |
| A video or audio downloadable
file |
500 KB to 10 MB |
500,000 |
| An MP3 (music)
downloadable file |
3 to 5 MB |
3,000,000 |
| A program or driver download |
Will usually say |
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How Much Information Produced |
How many bytes |
In Bytes |
| How much information each person
on earth produces per year |
1 to 2 exabytes |
1,000,000,000,000,000,000 |
| How much of the above is printed
information |
.03% of the total |
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| How much e-mail information per
year |
11,265 terabytes |
11,265,000,000,000,000 |
| How much radio information |
788 terabytes |
788,000,000,000,000 |
| How much TV information |
14,150 terabytes |
14,150,000,000,000,000 |
| How much telephone information |
576,000 terabytes |
576,000,000,000,000,000 |
| How much postal information |
150,000 terabytes |
150,000,000,000,000,000 |
| How much office document
information |
195 terabytes |
195,000,000,000,000 |
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