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Unit prefixes
The Internationally recognized official SI names for large and small numbers
are shown below. These are taken from the Bureau International des Poids et
Mesures (BIPM) website:
http://www.bipm.fr/en/si/prefixes.html
| yotta (Y) |
1024 |
1 septillion |
1,000,000,000,000,000,000,000,000 |
| zetta (Z) |
1021 |
1 sextillion |
1,000,000,000,000,000,000,000 |
| exa (E) |
1018 |
1 quintillion |
1,000,000,000,000,000,000 |
| peta (P) |
1015 |
1 quadrillion |
1,000,000,000,000,000 |
| tera (T) |
1012 |
1 trillion |
1,000,000,000,000 |
| giga (G) |
109 |
1 billion |
1,000,000,000 |
| mega (M) |
106 |
1 million |
1,000,000 |
| kilo (k) |
103 |
1 thousand |
1,000 |
| hecto (h) |
102 |
1 hundred |
100 |
| deka (da) |
10 |
1 ten |
10 |
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1 |
one unit |
1 |
| deci (d) |
10-1 |
1 tenth |
.1 |
| centi (c) |
10-2 |
1 hundredth |
.01 |
| milli (m) |
10-3 |
1 thousandth |
.001 |
| micro (µ) |
10-6 |
1 millionth |
.000001 |
| nano (n) |
10-9 |
1 billionth |
.000000001 |
| pico (p) |
10-12 |
1 trillionth |
.000000000001 |
| femto (f) |
10-15 |
1 quadrillionth |
.000000000000001 |
| atto (a) |
10-18 |
1 quintillionth |
.000000000000000001 |
| zepto (z) |
10-21 |
1 sextillionth |
.000000000000000000001 |
| yocto (y) |
10-24 |
1 septillionth |
.000000000000000000000001 |
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