Acres to Hectares Converter
Convert acres to hectares, square meters, and square feet instantly. Includes farmland, agricultural application rate, and international land comparison
Acres to Hectares Converter
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Formula: Hectares = Acres ร 0.404686
Worked example โ 4.047 hectares
Formula
Hectares = Acres ร 0.404686
1 acre = 0.404686 hectares. 1 hectare = 10,000 mยฒ = 2.47105 acres. The acre originates from Imperial/US customary land measurement (43,560 square feet), while the hectare is a metric unit defined as exactly 10,000 square meters, or a square 100 meters on each side.
Worked Examples
Example 1: 10 acres
Problem:Convert 10 acres
Solution:10 ร 0.404686 = 4.04686 ha
Result:4.047 hectares
Example 2: International Farmland Comparison
Problem:A US buyer is comparing a 250-acre American farm to a 95-hectare European farm. Which is larger?
Solution:Convert the US farm to hectares: 250 x 0.404686 = 101.17 hectares Compare: 101.17 hectares (US farm) vs 95 hectares (European farm) The US farm is larger by about 6.17 hectares (approximately 15.25 acres)
Result:250 acres (101.17 ha) is larger than 95 hectares by about 15.25 acres
Frequently Asked Questions
How many hectares in an acre?
1 acre = 0.404686 hectares. Conversely, 1 hectare = 2.47105 acres.
When are acres used versus hectares?
Acres are primarily used in the United States, United Kingdom, Canada, and a few other countries for measuring land area, particularly in real estate and agriculture. Hectares are the standard unit used internationally (SI system) and are preferred by scientists, farmers, and land managers in most countries outside the US. One hectare equals 10,000 square meters, making it easy to work with in metric calculations.
How big is an acre compared to a football field?
One acre is approximately 0.756 of an American football field including the end zones (which total about 1.32 acres), or about 76% of a standard soccer pitch. An acre contains 43,560 square feet, which is equivalent to a square roughly 208.7 feet on each side. For farming context, one acre can typically produce around 135 bushels of corn or support grazing for one or two cattle.
What are common land area conversions for farmers?
Farmers and landowners commonly need these conversions: 1 acre = 0.4047 hectares = 4,047 square meters = 43,560 square feet = 4,840 square yards. For larger areas: 640 acres = 1 square mile = 259 hectares. A quarter section (common in US agricultural land division) is 160 acres or about 64.75 hectares. Knowing these helps with crop planning, fertilizer application rates, and irrigation scheduling.
Why do international land deals and agricultural reports use hectares while US listings use acres?
Hectares are the land-area unit under the International System of Units (SI), so virtually every country outside the US, UK, and a handful of others reports farmland, forestry, and land-use statistics in hectares, including bodies like the FAO and World Bank in their global agricultural datasets. US real estate listings and farm sales, by contrast, are almost universally quoted in acres because that is the unit written into US property deeds, county land records, and the Public Land Survey System. Anyone comparing farmland prices per unit area across countries, or evaluating an overseas agricultural investment, needs to convert consistently to one unit to avoid understating or overstating land value by a factor of roughly 2.47.
How much fertilizer, seed, or water does an acre or hectare typically need?
Application rates are usually specified per acre in the US and per hectare elsewhere, so converting the area first prevents costly over- or under-application. As a rough example, corn is commonly seeded at 30,000-35,000 seeds per acre (about 74,000-86,000 per hectare), and nitrogen fertilizer application for corn often falls in the range of 140-180 lbs per acre (157-202 kg per hectare). Because a hectare is about 2.47 times larger than an acre, a rate quoted 'per hectare' must be divided by roughly 2.47 to get the equivalent 'per acre' rate, and vice versa โ a frequent source of costly errors when working from imported agricultural guidance.
How do I convert acres to square meters and square feet directly?
An acre is defined as 43,560 square feet, or 4,840 square yards, which works out to about 4,046.856 square metres. So multiply acres by 43,560 for square feet, or by 4,046.856 for square metres. The hectare factor used on this page is simply that last figure divided by 10,000, since a hectare is exactly 10,000 square metres, which is where the 0.404686 comes from.
How many acres are in a square kilometer?
A square kilometre contains 1,000,000 square metres, which is exactly 100 hectares, and multiplying by 2.47105 acres per hectare gives about 247.105 acres. Working the other way, an acre is roughly 0.00404686 square kilometres. This matters for regional land use and forestry statistics, which are usually reported in square kilometres or hectares while individual parcel records in the US remain in acres.
How do I convert a crop yield from bushels per acre to tonnes per hectare?
Yields do not convert with a single factor, because the bushel is a volume measure whose standard mass differs by crop. The method is to multiply the bushels per acre by the standard mass of one bushel of that specific crop in kilograms, which converts the numerator to mass, then multiply by 2.47105 to move from a per acre to a per hectare basis, and finally divide by 1,000 to reach tonnes. Always confirm the bushel mass and moisture basis for the crop before applying it.
Are all historical acres the same size as the modern statute acre?
No. The acre used today is the international statute acre of 43,560 square feet, but several regional customary acres existed before standardisation, including the Irish and Scottish acres, which were noticeably larger than the statute acre. Old deeds, tithe maps and estate records may therefore quote areas in a local acre that does not match modern figures. If a historical parcel size will not reconcile with a modern survey, a customary unit rather than a mapping error is often the explanation.
References
Background & Theory
1 acre = 0.40468564224 hectares exactly, and 1 hectare = 2.47105381 acres. The acre is defined as 43,560 square feet, and since the foot is exactly 0.3048 m the metric equivalent terminates; the reverse direction does not.
Conversion reference table
| Conversion | Equivalent | Exact or rounded? |
|---|---|---|
| 1 acre | 0.40468564224 hectares | Exact by definition |
| 1 acre | 4,046.8564224 square metres = 43,560 sq ft | Exact |
| 1 hectare | 2.47105381 acres | Derived, rounded |
| 1 hectare | 10,000 square metres | Exact by definition |
| 1 square mile | 640 acres = 258.998811 hectares | Exact / derived |
| 1 square kilometre | 100 hectares = 247.105381 acres | Exact / derived |
The acre began as the area one team of oxen could plough in a day and was standardised as one chain by one furlong, or 66 ft by 660 ft, which is where the odd 43,560 comes from. The hectare, by contrast, is simply a square 100 m on a side. Land registries in the United States and parts of the Commonwealth still record acres, so parcel areas often need converting before they can be compared with EU agricultural subsidy figures, which are always in hectares.
Reviewed for accuracy by Manoj Kumar, Mathematics Educator ยท Editorial policy
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