SI Prefixes

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The following units are included in this section:

 

ID

Unit

Definition

Wikipedia page and other notes

1

none (1)

1

https://en.wikipedia.org/wiki/Metric_prefix

2

deci (d)

10-1

https://en.wikipedia.org/wiki/Deci-

3

centi (c)

10-2

https://en.wikipedia.org/wiki/Centi-

4

milli (m)

10-3

https://en.wikipedia.org/wiki/Milli-

5

micro (μ)

10-6

https://en.wikipedia.org/wiki/Micro-

6

nano (n)

10-9

https://en.wikipedia.org/wiki/Nano-

7

pico (p)

10-12

https://en.wikipedia.org/wiki/Pico-

8

femto (f)

10-15

https://en.wikipedia.org/wiki/Femto-

9

atto (a)

10-18

https://en.wikipedia.org/wiki/Atto-

10

zepto (z)

10-21

https://en.wikipedia.org/wiki/Zepto-

11

yocto (y)

10-24

https://en.wikipedia.org/wiki/Yocto-

12

deca (da)

10

https://en.wikipedia.org/wiki/Deca-

13

hecto (h)

102

https://en.wikipedia.org/wiki/Hecto-

14

kilo (k)

103

https://en.wikipedia.org/wiki/Kilo-

15

mega (M)

106

https://en.wikipedia.org/wiki/Mega-

16

giga (G)

109

https://en.wikipedia.org/wiki/Giga-

17

tera (T)

1012

https://en.wikipedia.org/wiki/Tera-

18

peta (P)

1015

https://en.wikipedia.org/wiki/Peta-

19

exa (E)

1018

https://en.wikipedia.org/wiki/Exa-

20

zetta (Z)

1021

https://en.wikipedia.org/wiki/Zetta-

21

yotta (Y)

1024

https://en.wikipedia.org/wiki/Yotta-

 

All the above definitions of the various units are EXACT.

 

Type of conversion relationship: DIRECTLY PROPORTIONAL (y=ax)

Example conversion diagram (see two units in bold above - the example is in meters with m and nm, but anything else can be used):

SI Prefixes