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Hectares

The hectare (symbol ha) is an SI accepted metric system unit of area equal to 100 ares (10,000 m2) and primarily used in the measurement of land as a metric replacement for the imperial acre. An acre is about 0.405 hectare and one hectare contains about 2.47 acres.

In 1795, when the metric system was introduced, the "are" was defined as 100 square metres and the hectare ("hecto-" + "are") was thus 100 "ares" or  1/100 km2. When the metric system was further rationalized in 1960, resulting in the International System of Units (SI), the are was not included as a recognized unit. The hectare, however, remains as a non-SI unit accepted for use with the SI units, mentioned in Section 4.1 of the SI Brochure as a unit whose use is "expected to continue indefinitely.

Hectares
Symbol/abbreviation: ha
Unit of: AREA
AREA's base unit: square meters (Non-SI/Derived Unit)
In relation to the base unit (square meters), 1 Hectares = 10000 square meters.
[Conversion table] 1 Hectares (ha) to all area units
1 ha= 2.4710516301528 acres (ac)
1 ha= 100 ares (a)
1 ha= 2.4744621647609 arpents (arp)
1 ha= 1.0E+32 barns (barn)
1 ha= 1 bunders (b)
1 ha= 0.77519379844961 carreau (carreau)
1 ha= 0.020576131687243 carucate (carucate)
1 ha= 1.8532903610037 cawneys (cawney)
1 ha= 10000 centiares (ca)
1 ha= 19735251.599789 circular inches (c in)
1 ha= 19735252417697 circular mils (c mil)
1 ha= 2.5442731353539 cuerdas (cuerda)
1 ha= 10 decares (daa)
1 ha= 1000 deciares (da)
1 ha= 10 dekares (daa )
1 ha= 590.70234508831 dhurs (dhur)
1 ha= 10 dunams (dunam)
1 ha= 1.5032029649751E+32 electron cross sections (ecs)
1 ha= 9.8814229249012 farthingales (fa)
1 ha= 2.3809523809524 feddans (feddan)
1 ha= 1.868734483664 football fields (ff)
1 ha= 1 hectares (ha)
1 ha= 0.015444086341793 homesteads (hs)
1 ha= 5 jeribs (jerib)
1 ha= 6172.8395061728 jo JAPAN (jo)
1 ha= 64.825619084662 kapplands (kapp)
1 ha= 1.1672697560406 morgen SOUTH AFRICA (morgen)
1 ha= 0.12355269141747 nooks (nook)
1 ha= 0.16666666666667 oxgangs (oxgangs)
1 ha= 3024.9955381316 pings (ping)
1 ha= 3.8283373530876E+73 planck areas (Ap)
1 ha= 1.5625 plazas (plaza)
1 ha= 3024.9955381316 pyeongs (pyeong)
1 ha= 6.25 rais (ไร่)
1 ha= 9.8842152586866 roods (rood)
1 ha= 107639.1041671 sabins (sabin)
1 ha= 0.0038610215854781 sections (section)
1 ha= 1.4005602240896 soccer fields (soccer field)
1 ha= 1.0E+24 square angstroms (Å2, sq Å)
1 ha= 4.4683704831421E-19 square astronomical units (au2, sq au)
1 ha= 155038759689.92 square calibers (sq cal)
1 ha= 100000000 square centimeters (cm2, sq cm)
1 ha= 24.710538146717 square chains (sq ch)
1 ha= 47839.601852043 square cubits (sq cubit)
1 ha= 100 square decameters (dam2, sq dam)
1 ha= 1000000 square decimeters (dm2, sq dm)
1 ha= 100 square dekameters (dm2, sq dam)
1 ha= 27555610.666777 square digits (sq digit)
1 ha= 2989.9746151155 square fathoms (sq fath)
1 ha= 107639.15051182 square feet (ft2, sq ft)
1 ha= 1 square hectometers (hm2, sq hm)
1 ha= 15500031.000062 square inches (in2, sq in)
1 ha= 0.01 square kilometers (km2, sq km)
1 ha= 0.00032394816622014 square leagues NAUTICAL (sq leag [nautical])
1 ha= 0.0004290006866585 square leagues US STATUTE (sq leag [US statute])
1 ha= 247104.39364956 square links GUNTER SURVEY (sq li [survey])
1 ha= 107638.67316305 square links RAMDEN ENGINEER (sq li [engineer])
1 ha= 10000 square meters (m2, sq m)
1 ha= 1.0E+16 square micrometers (μ2, sq μ)
1 ha= 0.0038610215859254 square miles (mi2, sq mi)
1 ha= 10000000000 square millimeters (mm2, sq mm)
1 ha= 15500031000062 square mils (sq mil)
1 ha= 1.0E+22 square nanometers (nm2, sq nm)
1 ha= 1.0502647575668E-29 square parsecs (sq pc)
1 ha= 395.36861034746 square perch (sq perch)
1 ha= 395.36861034746 square poles (sq pole)
1 ha= 395.36861034746 square rods (sq rod)
1 ha= 11959.900463011 square yards (yd2, sq yd)
1 ha= 3.6913990402362 stangs (stang)
1 ha= 6172.8395061728 tatamis JAPAN (tatami)
1 ha= 1.8129079042785 tonde land (tondeland)
1 ha= 0.00010725059959523 townships (township)
1 ha= 3024.9863875613 tsubo (tsubo)
1 ha= 2.0257677659833 tunnlands (tunnland)
1 ha= 14311.536386366 varas castellanas cuads (varas-castellana)
1 ha= 1590.1707095962 varas conuqueras cuads (varas-conuquera)
1 ha= 0.083333333333333 virgates (virgate)