The following 25 Units are included in this category:
ID |
Unit (symbol) |
Definition |
Wikipedia page and other notes |
1 |
sq. metre (m2) |
- |
|
2 |
sq. centimetre (cm2) |
10-4 m2 |
https://en.wikipedia.org/wiki/Centimetre Page refers to centimetre, not sq. centimetre |
3 |
sq. millimetre (mm2) |
10-6 m2 |
https://en.wikipedia.org/wiki/Millimetre Page refers to millimetre, not sq. millimetre |
4 |
sq. kilometre (km2) |
106 m2 |
|
5 |
sq. inch (in2) |
1 in2 = 6.4516∙10-4 m2 |
|
6 |
sq. foot (ft2) |
1 ft2 = 0.09290304 m2 |
|
7 |
sq. yard (yd2) |
1 yd2 = 0.83612736 m2 |
|
8 |
sq. mile (mi2) |
1 mi2 = 2,589,988.110336 m2 |
https://en.wikipedia.org/wiki/Square_mile Not to be confused with other types of miles |
9 |
acre (ac) |
(1/640) mi2 |
|
10 |
are (a) |
100 m2 |
|
11 |
decare (daa) |
1000 m2 |
|
12 |
hectare (ha) |
10,000 m2 |
|
13 |
stremma [royal] |
1000 m2 |
|
14 |
barn (b) |
10-28 m2 |
|
15 |
sq. decimetre (dm2) |
10-2 m2 |
https://en.wikipedia.org/wiki/Decimetre Page refers to decimetre, not sq. decimetre |
16 |
sq. decametre (dam2) |
100 m2 |
https://en.wikipedia.org/wiki/Decametre Page refers to decametre, not sq. decametre |
17 |
sq. nautical mile (nmi2) |
3,429,904 m2 |
https://en.wikipedia.org/wiki/Nautical_mile Page refers to nautical mile, not sq. nautical mile. Not to be confused with other types of miles |
18 |
sq. angstrom (Å2) |
10-20 m2 |
https://en.wikipedia.org/wiki/Angstrom Page refers to angstrom, not sq. angstrom |
19 |
sq. hectometre (hm2) |
10,000 m2 |
https://en.wikipedia.org/wiki/Hectometre Page refers to hectometre, not sq. hectometre |
20 |
sq. light-year (ly2) |
89,505,421,074,818,927,300,612,528,640,000 m2 |
https://en.wikipedia.org/wiki/Light-year Page refers to light-year, not sq. light-year |
21 |
sq. micrometre (μm2) |
10-12 m2 |
https://en.wikipedia.org/wiki/Micrometre Page refers to micrometre, not sq. micrometer |
22 |
sq. nanometre (nm2) |
10-18 m2 |
https://en.wikipedia.org/wiki/Nanometre Page refers to nanometre, not sq. nanometre |
23 |
sq. thousandth of an inch (thou2) |
10-6 in2 |
https://en.wikipedia.org/wiki/Thousandth_of_an_inch Page refers to thousandth of an inch, not sq. thousandth of an inch |
24 |
sq. astronomical unit (AU2) |
22,379,522,917,973,918,490,000 m2 |
https://en.wikipedia.org/wiki/Astronomical_unit Page refers to astronomical unit, not sq. astronomical unit |
25 |
sq. parsec (pc2) |
(419,904,000,000/π2) AU2 |
https://en.wikipedia.org/wiki/Parsec Page refers to parsec, not sq. parsec |
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=a∙x)
Example conversion diagram (see two units in bold above):
