| Unit |
Symbol |
Definition |
Conversion to SI units |
| acre (international) |
ac |
= 1 ch x 10 ch = 4840 sq yd |
= 4 046.856 4224 m2 |
| acre (U. S. survey) |
ac |
= 10 sq ch = 4840 sq yd |
~ 4 046.873 m2 [15] |
| are |
a |
= 100 m2 |
= 100 m2 |
| barn |
b |
= 10-28 m2 |
= 10-28 m2 |
| barony |
|
= 4000 ac |
~ 1.618 742 x 107 m2 |
| board |
bd |
= 1 in x 1 ft |
= 7.741 92 x 10-3 m2 |
| boiler horsepower equivalent direct radiation |
bhp EDR |
= (1 ft2) (1 bhp) / (240 BTUIT/h) |
~ 12.958 174 m2 |
| circular inch |
circ in |
= p/4 sq in |
~ 5.067 075 x 10-4 m2 |
| circular mil; circular thou |
circ mil |
= p/4 mil2 |
~ 5.067 075 x 10-10 m2 |
| cord |
|
= 192 bd |
= 1.486 448 64 m2 |
| dunam |
|
= 1 000 m2 |
= 1 000 m2 |
| guntha |
|
= 121 sq yd |
~ 101.17 m2 |
| hectare |
ha |
= 10 000 m2 |
= 10 000 m2 |
| hide |
|
~ 120 ac (variable) |
~ 5 x 105 m2 |
| rood |
ro |
= 1/4 ac |
= 1 011.714 1056 m2 |
| section |
|
= 1 mi x 1 mi |
= 2.589 988 110 336 x 106 m2 |
| shed |
|
= 10-52 m2 |
= 10-52 m2 |
| square (roofing) |
|
= 10 ft x 10 ft |
= 9.290 304 m2 |
| square chain (international) |
sq ch |
= 66 ft x 66 ft = 1/10 ac |
= 404.685 642 24 m2 |
| square chain (U.S. Survey) |
sq ch |
= 66 ft(US) x 66 ft(US) = 1/10 ac |
~ 404.687 3 m2 |
| square foot |
sq ft |
= 1 ft x 1 ft |
= 9.290 304 x 10-2 m2 |
| square foot (U.S. Survey) |
sq ft |
= 1 ft (US) x 1 ft (US) |
~ 9.290 341 161 327 49 x 10-2 m2 |
| square inch |
sq in |
= 1 in x 1 in |
= 6.4516 x 10-4 m2 |
| square kilometre |
km2 |
= 1 km x 1 km |
= 106 m2 |
| square link (Gunter's)(International) |
sq lnk |
= 1 lnk x 1 lnk = 0.66 ft x 0.66 ft |
= 4.046 856 4224 x 10-2 m2 |
| square link (Gunter's)(US Survey) |
sq lnk |
= 1 lnk x 1 lnk = 0.66 ft(US) x 0.66 ft(US) |
~ 4.046 872 x 10-2 m2 |
| square link (Ramsden's) |
sq lnk |
= 1 lnk x 1 lnk = 1 ft x 1 ft |
= 0.09290304 m2 |
| square metre (SI unit) |
m2 |
= 1 m x 1 m |
= 1 m2 |
| square mil; square thou |
sq mil |
= 1 mil x 1 mil |
= 6.4516 x 10-10 m2 |
| square mile |
sq mi |
= 1 mi x 1 mi |
= 2.589 988 110 336 x 106 m2 |
| square mile (U.S. Survey) |
sq mi |
= 1 mi (US) x 1 mi (US) |
~ 2.589 998 47 x 106 m2 |
| square rod/pole/perch |
sq rd |
= 1 rd x 1 rd |
= 25.292 852 64 m2 |
| square yard (International) |
sq yd |
= 1 yd x 1 yd |
= 0.836 127 36 m2 |
| stremma |
|
= 1 000 m2 |
= 1 000 m2 |
| township |
|
= 36 sq mi (US) |
~ 9.323 994 x 107 m2 |
| yardland |
|
~ 30 ac |
~ 1.2 x 105 m2 |
