Knowledge (XXG)

Hectare

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measurements (e.g. Canada) required a resurvey when units of measure in legal descriptions relating to land were converted to metric units. Others, such as South Africa, published conversion factors which were to be used particularly "when preparing consolidation diagrams by compilation".
474:. In practice the hectare is fully derived from the SI, being equivalent to a square hectometre. It is widely used throughout the world for the measurement of large areas of land, and it is the legal unit of measure in domains concerned with land ownership, planning, and 701:(EEC) passed directive 71/354/EEC, which catalogued the units of measure that might be used within the Community. The units that were catalogued replicated the recommendations of the CGPM, supplemented by a few other units including the 2079:
Robinson's Progressive Practical Arithmetic: Containing the Theory of Numbers in Connection with Concise Analytic and Synthetic Methods of Solution, and Designed as a Complete Text-book on this Science for Common Schools and
2050: 289:
was not included as a recognised unit. The hectare, however, remains as a non-SI unit accepted for use with the SI and whose use is "expected to continue indefinitely". Though the dekare/decare
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In many countries, metrification redefined or clarified existing measures in terms of metric units. The following legacy units of area have been redefined as being equal to one hectare:
2054: 1961:[The law of 18 Germanial year 3 "The measure of land area equivalent to a ten-metre square"] (in French). Le CIV (Centre d'Instruction de Vilgénis) – Forum des Anciens 1633:"Council Directive 80/181/EEC of 20 December 1979 on the approximation of the laws of the Member States relating to Unit of measurement and on the repeal of Directive 71/354/EEC" 1762: 683: 1654: 1726: 218:
sides (1 hm), that is, 10,000 square metres (10,000 m), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An
2028: 2768: 1844: 1981: 2271: 1790: 1517:"Department for Environment, Food and Rural Affairs, and Rural Payments Agency; The Delays in Administering the 2005 Single Payment Scheme in England" 1937: 1533: 614:
In Mexico, land area measurements are commonly given as combinations of hectares, ares, and centiares. These are commonly written separated by a
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in the 2019 edition of the SI brochure, but classifies the hectare as a "Non-SI unit accepted for use with the International System of Units".
1959:"La loi du 18 Germinal an 3 " la mesure [républicaine] de superficie pour les terrains, égale à un carré de dix mètres de côté »" 2332: 2457: 1316: 869:(SI). It is still commonly used in speech to measure real estate, in particular in Indonesia, India, and in various European countries. 309: 2051:"Council Directive of 18 October 1971 on the approximation of laws of the member states relating to units of measurement, (71/354/EEC)" 1773: 2484: 1453:
block, is intended for compatibility with pre-existing East Asian character codes. It is not intended for use in alphabetic contexts.
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as a measure of land area. The names of the older land measures of similar size are usually used, redefined as exactly one decare:
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Two categories of rent, fixed and proportional, are payable to the state by mine-owners. The fixed rent is 10 piastres per
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plots or small city parks where the hectare would be too large. Many Russian dachas are 6 ares in size (in Russian,
2161: 1867: 635: 498:(since 1970). However, the United Kingdom, the United States, Myanmar (Burma), and to some extent Canada, use the 2296:Λεξικό της κοινής Νεοελληνικής (Dictionary of Modern Greek), Ινστιτούτο Νεοελληνικών Σπουδών, Θεσσαλονίκη, 1998. 1829: 1587: 145:
Image comparing the hectare (the small blue area at lower left) to other units. The entire yellow square is one
2732: 1996: 2275: 2773: 1794: 412: 277: km (10,000 square metres). When the metric system was further rationalised in 1960, resulting in the 2819: 2477: 819: 1697: 1537: 1848:. Vol. 27 (11th ed.). Cambridge University Press. pp. 426–467, see page 442 second para. 2758: 2104: 1487: 2458:
Official SI website: Table 6. Non-SI units accepted for use with the International System of Units
2021: 1908: 2135: 2130: 1929: 1731: 1497: 1026: 2125: 1516: 2378: 2209: 786:
is non-standard. The decimilliare is (100 mm) or roughly a four-inch-by-four-inch square.
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Encyclopaedia of scientific units, weights, and measures: their SI equivalences and origins
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BS350:Part 1:1974 Conversion factors and tables Part 1. Basis of tables. Conversion factors
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In 1960, when the metric system was updated as the International System of Units (SI), the
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Some countries that underwent a general conversion from traditional measurements to
2707: 2664: 2649: 2604: 2584: 2501: 2210:"are – definition. American English definition of are by Macmillan Dictionary" 1340: 877: 252: 110: 1958: 2318: 2579: 2534: 1907:] (in Dutch). 's-Gravenhage and Amsterdam: de Gebroeders van Cleef. p.  1306: 1212: 1152: 1122: 985: 607: 207: 146: 2438: 1492: 1370: 1315: 1182: 717: 630:
The metric system of measurement was first given a legal basis in 1795 by the
2412: 2094: 2644: 2559: 2324: 687: 596: 495: 256: 1854:(about 10,000 square metres), to be paid whether the mine is worked or not. 17: 2524: 2231: 1376: 989: 769: 657: 483: 2697: 2639: 2569: 2564: 2514: 1875: 1676: 1433: 1402: 1034: 1018: 998: 238: 1592: 861:), used for measuring land area. It was defined by older forms of the 622:
would mean 1 hectare, 21 ares, and 0.26 centiares (12,100.26 m).
2727: 2629: 2539: 2519: 2509: 1355: 1042: 1030: 1022: 1004: 977: 602: 575: 550: 464:), although not a unit of SI, is the only named unit of area that is 282: 260: 1995:(in French). Université de Technologie de Compiègne. Archived from 222:
is about 0.405 hectares and one hectare contains about 2.47 acres.
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Mandated landscape: British imperial rule in Palestine, 1929–1948
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Metric and British imperial/United States customary comparisons
976:, and is equal to 10 ares or 1000 square metres. It is used in 671: 615: 531: 499: 479: 219: 211: 70: 2466: 2692: 2619: 2609: 958: 849: 444: 178: 1833: 453: 1793:. Law Society of South Africa. November 2007. Archived from 952: 835: 187: 2462: 946: 502:
instead of the hectare for measuring surface or land area.
435: 196: 169: 2377:. London, Berlin and Heidelberg: Springer Verlag. p.  1631:
The Council of the European Communities (27 May 2009).
818:"Are (unit)" redirects here. For the English verb, see 1473: 904:
hectare). It is used to describe the size of suburban
1791:"Instructions for the Conversions of Areas to Metric" 1522:. National Audit Office. 18 October 2006. p. 27. 949: 438: 172: 2274:. BNR Radio Bulgaria. 5 October 2010. Archived from 943: 709:) whose use was limited to the measurement of land. 456: 450: 441: 245:
In 1795, when the metric system was introduced, the
184: 175: 2751: 2673: 2548: 2500: 940: 432: 429: 166: 163: 123: 106: 84: 76: 66: 54: 49: 32: 2370: 2076:Robinson, Horatio Nelson; Fish, Daniel W. (1858). 1604: 1602: 1559:Bureau international des poids et mesures (2006), 1319:An acre shown inside a hectare for size comparison 2358:. British Standards Institution. 1974. p. 7. 857:) is a unit of area, equal to 100 square metres ( 684:International Committee for Weights and Measures 682:did not receive international recognition. The 468:. The name was coined in French, from the Latin 1763:"Working Paper No. 6 – Agroindustry in Myanmar" 1047: 2250:Grain and oil seeds, area and production, 2002 1467: 1338: 782:are or one square decimetre. Such usage of a 638:(7 April 1795) defined five units of measure: 2478: 1419: 1411: 1009: 913: 885: 8: 2029:International Bureau of Weights and Measures 1391: 1383: 1353: 2769:Historical definitions of the SI base units 2413:"Chinese Measurements – Units of Area" 1400: 996: 469: 2485: 2471: 2463: 1478:), the Japanese translation of "hectare". 1368: 38: 29: 2272:"Market of agricultural land in Bulgaria" 1938:Secretariat of Public Education of Mexico 772:area evaluation of real estate plots) is 660:(1 m) for volume of stacked firewood 2083:. Ivison, Blakeman, Taylor. p. 363. 1727:"Appendix G – Weights and Measures" 1093:British imperial/United States customary 1062: 306: 1866:Oscar van Vlijmen (11 September 2006). 1508: 876:and some other languages of the former 752:to the original base unit of area, the 1562:The International System of Units (SI) 1770:MYA/01/008 Agriculture Sectore Review 1536:. Oxford Dictionaries. Archived from 7: 1323:The most commonly used units are in 810:(rarely used) is ten square metres. 61:Non-SI unit accepted for use with SI 1900:Allereerste Gronden der Cijferkunst 1872:Eenheden, constanten en conversies 1816:Britannica.com, unit of measurement 1330:One hectare is also equivalent to: 748:are derived by adding the standard 527: 241:is a little over a hectare in size. 2022:"SI brochure (Chapter 4; Table 8)" 1828:Caillard, Vincent Henry Penalver; 1653:Commonwealth of Australia (1970). 894:: 'a hundred', i.e. 100 m or 25: 667:(1 dm) for volumes of liquid 419:has an area of about one hectare. 88: 2792: 2791: 936: 865:, but is now outside the modern 845: 831: 425: 159: 2246:"Decrease in total grain yield" 1698:"Weights and Measures Act 1985" 1014:, dunum, dulum, donum, or dönüm 127:Imperial and US customary units 2779:System of units of measurement 1993:Tout sur les unités de mesure 1934:Nueva Escuela Mexicana Digital 580: 571: 563: 466:accepted for use with SI units 44:A visualisation of one hectare 1: 2167:Merriam-Webster, Incorporated 867:International System of Units 279:International System of Units 2369:François Cardarelli (2003). 233:. The playing field used in 2313:El-Eini, Roza I.M. (2006). 2232:"SI brochure (8th edition)" 1474: 1420: 1412: 1401: 1392: 1384: 1369: 1354: 1339: 997: 886: 699:European Economic Community 214:equal to a square with 100- 2841: 2162:Merriam Webster Dictionary 1874:(in Dutch). Archived from 1830:Gibb, Elias John Wilkinson 1818:, accessed 30 October 2009 817: 690:) makes no mention of the 229:St. Enda's GAA ground, in 2787: 2439:"CJK Compatibility block" 2212:. Macmillandictionary.com 1588:Oxford English Dictionary 1468: 914: 891: 357: 102: 37: 2733:minute and second of arc 1930:"Superficie de terrenos" 1905:Introduction to Numeracy 1897:Jacob de Gelder (1824). 768:(dma, sometimes seen in 650: 634:government. The law of 263:" + "are") was thus 100 2774:2019 revision of the SI 2315:"Currency and Measures" 1845:Encyclopædia Britannica 1675:Metric Pioneer (2020). 1655:"Metric Conversion Act" 1739:. 2006. Archived from 1611:"SI Brochure, Table 6" 1320: 1048: 1010: 729: 653:(100 m) for area 546: 470: 420: 242: 150: 133:11,960 sq yd 2417:On-line Chinese Tools 2190:. Oxford Dictionaries 1318: 798:is one square metre. 720: 636:18 Germinal, Year III 415: 228: 144: 2675:Other accepted units 1466:is a combination of 705:(and implicitly the 632:French Revolutionary 259:, and the hectare (" 2825:Non-SI metric units 2759:Conversion of units 2252:. Statistics Norway 2234:. BIPM. March 2006. 2105:Dictionary.com, LLC 1980:Thierry Thomasset. 1488:Conversion of units 1334:1 square hectometre 1065: 560:traditional Chinese 494:, New Zealand and 387:107,639 sq ft 358:non-SI comparisons 312: 293:(1,000 m) and 251:was defined as 100 97:... is equal to ... 50:General information 27:Metric unit of area 2552:with special names 2400:metrication malta. 2278:on 22 October 2010 2136:Collins Publishers 2131:Collins Dictionary 1732:The World Factbook 1705:British Government 1498:Order of magnitude 1321: 1063: 980:and in the former 966:) is derived from 730: 568:simplified Chinese 421: 307: 243: 151: 131:    125:    117:    108:    2805: 2804: 2683:astronomical unit 2334:978-0-7146-5426-3 2327:. p. xxiii. 1540:on 1 January 2011 1451:CJK Compatibility 1313: 1312: 478:, including law ( 410: 409: 139: 138: 85:Conversions 16:(Redirected from 2832: 2795: 2794: 2487: 2480: 2473: 2464: 2446: 2445: 2443: 2434: 2428: 2427: 2425: 2423: 2409: 2403: 2402: 2397: 2395: 2376: 2366: 2360: 2359: 2352: 2346: 2345: 2343: 2341: 2310: 2304: 2294: 2288: 2287: 2285: 2283: 2268: 2262: 2261: 2259: 2257: 2242: 2236: 2235: 2228: 2222: 2221: 2219: 2217: 2206: 2200: 2199: 2197: 2195: 2184: 2178: 2177: 2175: 2173: 2153: 2147: 2146: 2144: 2142: 2122: 2116: 2115: 2113: 2111: 2091: 2085: 2084: 2073: 2067: 2066: 2064: 2062: 2057:on 25 April 2009 2053:. Archived from 2047: 2041: 2040: 2038: 2036: 2026: 2018: 2012: 2011: 2009: 2007: 2001: 1990: 1977: 1971: 1970: 1968: 1966: 1955: 1949: 1948: 1946: 1944: 1926: 1920: 1919: 1917: 1915: 1894: 1888: 1887: 1885: 1883: 1870:[Area]. 1863: 1857: 1856: 1837: 1825: 1819: 1813: 1807: 1806: 1804: 1802: 1797:on 20 March 2018 1787: 1781: 1780: 1778: 1772:. Archived from 1767: 1759: 1753: 1752: 1750: 1748: 1723: 1717: 1716: 1714: 1712: 1702: 1694: 1688: 1687: 1685: 1683: 1677:"Metric Pioneer" 1672: 1666: 1665: 1663: 1661: 1650: 1644: 1643: 1641: 1639: 1628: 1622: 1621: 1619: 1617: 1606: 1597: 1584: 1578: 1576: 1575: 1573: 1567: 1556: 1550: 1549: 1547: 1545: 1530: 1524: 1523: 1521: 1513: 1477: 1471: 1470: 1465: 1464:SQUARE HEKUTAARU 1462: 1459: 1457: 1448: 1445: 1442: 1440: 1423: 1417: 1406: 1395: 1389: 1374: 1359: 1344: 1300: 1298: 1295: 1286: 1272: 1265:square kilometre 1253: 1251: 1242: 1208: 1203: 1178: 1173: 1148: 1143: 1118: 1113: 1082:succeeding unit 1066: 1053: 1016: 1002: 965: 964: 961: 960: 955: 954: 951: 948: 945: 942: 917: 916: 910:allotment garden 903: 902: 898: 893: 889: 860: 856: 855: 852: 851: 842: 841: 838: 837: 781: 780: 776: 721:Definition of a 689: 582: 573: 565: 529: 482:), agriculture, 473: 463: 462: 459: 458: 455: 452: 447: 446: 443: 440: 437: 434: 431: 417:Trafalgar Square 313: 284: 276: 275: 271: 255:, or one square 194: 193: 190: 189: 186: 181: 180: 177: 174: 171: 168: 165: 132: 126: 118: 109: 42: 30: 21: 2840: 2839: 2835: 2834: 2833: 2831: 2830: 2829: 2810: 2809: 2806: 2801: 2783: 2764:Metric prefixes 2747: 2669: 2551: 2544: 2496: 2491: 2454: 2449: 2441: 2436: 2435: 2431: 2421: 2419: 2411: 2410: 2406: 2393: 2391: 2389: 2368: 2367: 2363: 2354: 2353: 2349: 2339: 2337: 2335: 2312: 2311: 2307: 2295: 2291: 2281: 2279: 2270: 2269: 2265: 2255: 2253: 2244: 2243: 2239: 2230: 2229: 2225: 2215: 2213: 2208: 2207: 2203: 2193: 2191: 2186: 2185: 2181: 2171: 2169: 2155: 2154: 2150: 2140: 2138: 2124: 2123: 2119: 2109: 2107: 2093: 2092: 2088: 2075: 2074: 2070: 2060: 2058: 2049: 2048: 2044: 2034: 2032: 2024: 2020: 2019: 2015: 2005: 2003: 2002:on 21 July 2011 1999: 1988: 1979: 1978: 1974: 1964: 1962: 1957: 1956: 1952: 1942: 1940: 1928: 1927: 1923: 1913: 1911: 1896: 1895: 1891: 1881: 1879: 1878:on 19 June 2021 1865: 1864: 1860: 1827: 1826: 1822: 1814: 1810: 1800: 1798: 1789: 1788: 1784: 1779:on 15 May 2013. 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1342: 1336: 1333: 1332: 1331: 1328: 1326: 1317: 1309: 1308: 1303: 1301: 1289: 1287: 1282: 1280: 1278: 1275: 1273: 1268: 1266: 1263: 1262: 1259: 1258:2.47105 acres 1256: 1254: 1245: 1243: 1238: 1236: 1233: 1231: 1228: 1226: 1223: 1221: 1218: 1217: 1214: 1210: 1205: 1202:31.623 m 1200: 1197: 1194: 1191: 1188: 1187: 1184: 1180: 1175: 1170: 1167: 1164: 1161: 1158: 1157: 1154: 1150: 1145: 1142:3.1623 m 1140: 1137: 1134: 1131: 1128: 1127: 1124: 1120: 1115: 1110: 1107: 1105: 1102: 1099: 1098: 1092: 1089: 1084: 1079: 1074: 1071: 1068: 1067: 1058: 1052: 1051: 1046: 1044: 1040: 1036: 1032: 1028: 1024: 1020: 1015: 1013: 1008: 1006: 1001: 1000: 995: 994: 993: 991: 987: 984:areas of the 983: 979: 975: 971: 970: 963: 933: 929: 921: 919: 911: 907: 888: 883: 879: 875: 870: 868: 864: 863:metric system 854: 840: 828: 821: 813: 811: 809: 801: 799: 797: 789: 787: 785: 784:double prefix 771: 767: 759: 757: 755: 751: 747: 743: 739: 735: 728: 724: 719: 712: 710: 708: 704: 700: 697:In 1972, the 695: 693: 685: 681: 673: 669: 666: 662: 659: 655: 652: 648: 645: 641: 640: 639: 637: 633: 625: 623: 621: 620:1-21-00.26 ha 617: 609: 605: 604: 600: 598: 594: 593: 589: 587: 583: 577: 569: 561: 557: 554: 552: 548: 544: 540: 539: 535: 533: 525: 521: 520: 516: 515: 514: 511: 508: 503: 501: 497: 493: 489: 488:town planning 485: 481: 477: 472: 467: 461: 423:The hectare ( 418: 414: 405: 402: 401: 397: 394: 393: 389: 386: 385: 381: 378: 377: 373: 371:0.3861 sq mi 370: 369: 365: 362: 361: 356: 350: 347: 346: 342: 339: 338: 334: 331: 330: 326: 323: 322: 318: 315: 314: 311: 305: 300: 298: 296: 292: 288: 280: 266: 262: 258: 254: 253:square metres 250: 249: 240: 236: 232: 227: 223: 221: 217: 213: 209: 206: 202: 198: 192: 156: 148: 143: 129: 122: 115: 112: 111:SI base units 105: 101: 98: 95: 93: 89: 83: 79: 75: 72: 69: 65: 62: 59: 57: 53: 48: 41: 36: 31: 19: 2807: 2712: 2708:electronvolt 2432: 2420:. 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Index

Are (unit)

Unit system
Non-SI unit accepted for use with SI
Area
SI base units

square mile
/ˈhɛktɛər,-tɑːr/
SI
non-SI
metric unit
area
metre
acre

Omagh
Gaelic football
hurling
square metres
decametre
hecto-
International System of Units
area units

Trafalgar Square
/ˈhɛktɛər,-tɑːr/
accepted for use with SI units
management
land deeds

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