1 acre = 0.40468564 ha
1 ac = 0.404686 ha · type math like (12*4)+6.5
Acres to hectares is a farming, forestry and land-sale conversion. US, UK and Australian land is often described in acres, while agricultural statistics, EU subsidy schemes and most international markets work in hectares.
Farm subsidies and yields are a common reason to convert. EU and UK subsidy schemes pay per hectare, while US crop yields are given in bushels per acre. A corn yield of 180 bushels per acre is about 11.3 tonnes per hectare.
Real estate in the US often sells rural land in acres, and buyers from metric countries convert to hectares to compare prices. A price of $5,000 per acre is $12,355 per hectare, because there are 2.471 acres in one hectare.
Historical documents also use acres. The original Louisiana Purchase covered about 530 million acres, which is roughly 214 million hectares. The US Public Land Survey divides land into sections of 640 acres (259 ha) and quarter sections of 160 acres (64.7 ha).
Sports fields also illustrate the size. A standard soccer pitch of 105 × 68 m covers 0.714 ha, which is 1.76 acres.
Urban developments in the US are described in acres. A 10 acre housing development is 4.05 ha. In the UK, planning applications use hectares, so housing density is quoted in dwellings per hectare. Thirty homes per hectare is about 12 homes per acre.
Ranches in the American West can be huge. The King Ranch in Texas covers about 825,000 acres, which is 333,900 ha, larger than the US state of Rhode Island.
Wildlife conservation projects often compare land in both units. A 1,000 acre reserve is 404.7 ha, about 4 km².
A sense check: the hectare number should be about 40% of the acre number. A 100 acre farm should come out close to 40 ha (40.47 exactly). If your answer is larger than the acre figure, you multiplied by 2.471 instead of 0.4047. Land registry documents may round hectares to four decimal places, so keep that precision when the figure will be used for legal purposes.
ha = ac × 0.4046856422
Reverse: 1 ha = 2.4710538 ac.
Convert a 40 acre farm to hectares.
Answer: 40 acres = 16.19 ha.
| ac | ha |
|---|---|
| ¼ ac | 0.10117141 ha |
| ½ ac | 0.20234282 ha |
| ¾ ac | 0.30351423 ha |
| 1 ac | 0.40468564 ha |
| 2 ac | 0.80937128 ha |
| 3 ac | 1.2140569 ha |
| 4 ac | 1.6187426 ha |
| 5 ac | 2.0234282 ha |
| 6 ac | 2.4281139 ha |
| 7 ac | 2.8327995 ha |
| 8 ac | 3.2374851 ha |
| 9 ac | 3.6421708 ha |
| 10 ac | 4.0468564 ha |
| 11 ac | 4.4515421 ha |
| 12 ac | 4.8562277 ha |
| 13 ac | 5.2609133 ha |
| ac | ha |
|---|---|
| 14 ac | 5.665599 ha |
| 15 ac | 6.0702846 ha |
| 16 ac | 6.4749703 ha |
| 17 ac | 6.8796559 ha |
| 18 ac | 7.2843416 ha |
| 19 ac | 7.6890272 ha |
| 20 ac | 8.0937128 ha |
| 25 ac | 10.117141 ha |
| 30 ac | 12.140569 ha |
| 40 ac | 16.187426 ha |
| 50 ac | 20.234282 ha |
| 75 ac | 30.351423 ha |
| 100 ac | 40.468564 ha |
| 250 ac | 101.17141 ha |
| 500 ac | 202.34282 ha |
| 1 000 ac | 404.68564 ha |
The 160 acre US homestead claim is 64.75 ha.
640 acres is 259 ha, or 2.59 km².
A 1.76 acre pitch is about 0.71 ha.
A hectare is about 2.47 acres. Treating them as equal overstates land by 147%.
US survey acres were about 4 parts per million larger. It only matters on very large or legal surveys.
An acre is an area, any shape. Square, it would be 63.6 m on each side.
An international acre is exactly 4,046.8564224 m², or 43,560 ft². It equals 0.4047 ha.
Origin. In medieval England an acre was the land a team of oxen could plough in one day, defined as one furlong by one chain (660 × 66 ft).
Used today. Real estate and farmland in the US, UK, Canada, India, Pakistan, Australia and other former British territories.
A hectare is 10,000 m², a square 100 m on each side.
Origin. Defined in the metric system from the are (100 m²), with hecto- meaning 100. It was formally accepted for use with SI in 1879.
Used today. Agriculture, forestry, land registries and national statistics worldwide.
0.4047 ha.
About 16.2 ha.
2.471 acres.
4,046.86 m².
A chain (66 ft) times a furlong (660 ft) is 43,560 ft².