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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= 2.47105163015 acres (ac)
1 ha= 100 ares (a)
1 ha= 2.47446216476 arpents (arp)
1 ha= 1.0E+32 barns (barn)
1 ha= 1 bunders (b)
1 ha= 0.77519379845 carreau (carreau)
1 ha= 0.0205761316872 carucate (carucate)
1 ha= 1.853290361 cawneys (cawney)
1 ha= 10000 centiares (ca)
1 ha= 19735251.5998 circular inches (c in)
1 ha= 1.97352524177E+13 circular mils (c mil)
1 ha= 2.54427313535 cuerdas (cuerda)
1 ha= 10 decares (daa)
1 ha= 1000 deciares (da)
1 ha= 10 dekares (daa )
1 ha= 590.702345088 dhurs (dhur)
1 ha= 10 dunams (dunam)
1 ha= 1.50320296498E+32 electron cross sections (ecs)
1 ha= 9.8814229249 farthingales (fa)
1 ha= 2.38095238095 feddans (feddan)
1 ha= 1.86873448366 football fields (ff)
1 ha= 1 hectares (ha)
1 ha= 0.0154440863418 homesteads (hs)
1 ha= 5 jeribs (jerib)
1 ha= 6172.83950617 jo JAPAN (jo)
1 ha= 64.8256190847 kapplands (kapp)
1 ha= 1.16726975604 morgen SOUTH AFRICA (morgen)
1 ha= 0.123552691417 nooks (nook)
1 ha= 0.166666666667 oxgangs (oxgangs)
1 ha= 3024.99553813 pings (ping)
1 ha= 3.82833735309E+73 planck areas (Ap)
1 ha= 1.5625 plazas (plaza)
1 ha= 3024.99553813 pyeongs (pyeong)
1 ha= 6.25 rais (ไร่)
1 ha= 9.88421525869 roods (rood)
1 ha= 107639.104167 sabins (sabin)
1 ha= 0.00386102158548 sections (section)
1 ha= 1.40056022409 soccer fields (soccer field)
1 ha= 1.0E+24 square angstroms (Å2, sq Å)
1 ha= 4.46837048314E-19 square astronomical units (au2, sq au)
1 ha= 155038759690 square calibers (sq cal)
1 ha= 100000000 square centimeters (cm2, sq cm)
1 ha= 24.7105381467 square chains (sq ch)
1 ha= 47839.601852 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= 27555610.6668 square digits (sq digit)
1 ha= 2989.97461512 square fathoms (sq fath)
1 ha= 107639.150512 square feet (ft2, sq ft)
1 ha= 1 square hectometers (hm2, sq hm)
1 ha= 15500031.0001 square inches (in2, sq in)
1 ha= 0.01 square kilometers (km2, sq km)
1 ha= 0.00032394816622 square leagues NAUTICAL (sq leag [nautical])
1 ha= 0.000429000686658 square leagues US STATUTE (sq leag [US statute])
1 ha= 247104.39365 square links GUNTER SURVEY (sq li [survey])
1 ha= 107638.673163 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= 0.00386102158593 square miles (mi2, sq mi)
1 ha= 10000000000 square millimeters (mm2, sq mm)
1 ha= 1.55000310001E+13 square mils (sq mil)
1 ha= 1.0E+22 square nanometers (nm2, sq nm)
1 ha= 1.05026475757E-29 square parsecs (sq pc)
1 ha= 395.368610347 square perch (sq perch)
1 ha= 395.368610347 square poles (sq pole)
1 ha= 395.368610347 square rods (sq rod)
1 ha= 11959.900463 square yards (yd2, sq yd)
1 ha= 3.69139904024 stangs (stang)
1 ha= 6172.83950617 tatamis JAPAN (tatami)
1 ha= 1.81290790428 tonde land (tondeland)
1 ha= 0.000107250599595 townships (township)
1 ha= 3024.98638756 tsubo (tsubo)
1 ha= 2.02576776598 tunnlands (tunnland)
1 ha= 14311.5363864 varas castellanas cuads (varas-castellana)
1 ha= 1590.1707096 varas conuqueras cuads (varas-conuquera)
1 ha= 0.0833333333333 virgates (virgate)