Length and Distance

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The following units are included in this section:

 

ID

Unit

Definition

Wikipedia page and other notes

1

metre (m)

-

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

2

centimetre (cm)

10-2 m

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

3

millimetre (mm)

10-3 m

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

4

kilometre (km)

1000 m

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

5

inch (in)

0.0254 m

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

6

foot (ft)

12 in = 0.3048 m

https://en.wikipedia.org/wiki/Foot_(unit)

7

yard (yd)

3 ft = 0.9144 m

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

8

mile (mi)

5280 ft = 1,760 yd = 1,609.344 m

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

Sometimes distinguished as the "land mile", "statute mile", or "international mile". Not to be confused with other types of miles

 

9

decimetre (dm)

10-1 m

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

10

decametre (dam)

10

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

11

nautical mile (nmi)

1852 m

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

Not to be confused with other types of miles

12

ångström (Å)

10-10 m

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

 

13

hectometre (hm)

100 m

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

14

light-year (ly)

9,460,730,472,580,800 m

https://en.wikipedia.org/wiki/Light-year

15

micrometre (μm)

10-6 m

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

16

nanometre (nm)

10-9 m

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

17

thousandth of an inch (thou, mil)

10-3 inches

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

18

astronomical unit (AU)

149,597,870,700 m

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

19

parsec (pc)

(648,000/π) AU

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

20

fathom

6 ft

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

21

chain (ch)

66 ft

https://en.wikipedia.org/wiki/Chain_(unit)

 

All the above definitions of the various units are EXACT.

Note: In the above, a period (.) is used to indicate the decimal place and a comma (,) is used to separate groups of thousands.

 

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

Example conversion diagram (see two units in bold above):

Length