Convert ha to acres hectares ↔ acres Free Online Secure
Type a value in hectares and read it in acres at once. The factor is exact by definition, the arithmetic happens in your browser, and nothing is sent anywhere.
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Common values — Convert ha to acres (hectares ↔ acres)
| ha | ac |
|---|---|
| 1 | 2.47105381467 |
| 2 | 4.94210762934 |
| 3 | 7.41316144401 |
| 5 | 12.3552690734 |
| 10 | 24.7105381467 |
| 20 | 49.4210762934 |
| 50 | 123.552690734 |
| 100 | 247.105381467 |
Where these units come from
Square units need no definition of their own: a square metre is a metre by a metre, and everything follows from the length. The land measures are older and stranger. The acre began as the land a yoke of oxen could plough in a day, which is why it was long and thin rather than square — one chain by one furlong, 4840 square yards. The hectare and the are came out of the French Revolution, when land had to be measured in something decimal; neither belongs to the International System, but both were kept for land because a hectare is a comfortable size to picture and a square metre is not. Since the 1959 agreement on the yard, the acre is exactly 4046.8564224 square metres, so the conversions on this page are exact rather than approximate.
Where you meet them
Square metres price flats, size carpets and decide how much paint a wall needs; square feet do the same work in the United States and in much of the property market worldwide. Hectares belong to farmland, forests and planning permissions; acres to land deeds in the English-speaking world. Square kilometres and square miles are for countries, lakes and fires. Square centimetres and square millimetres live in workshops, on datasheets and anywhere a cross-section matters.
Questions people ask
How big is a hectare, really?
A hectare is a square of 100 m by 100 m, which is 10,000 square metres or about 2.47 acres. A full-size football pitch, touchline to touchline, is roughly 0.7 of a hectare, so a hectare is a pitch and a half. The are, now rarely used on its own, is a hundredth of that: 100 square metres, a square ten metres on a side.
Is an acre the same in the United States?
For every practical purpose, yes. The international acre used here is exactly 4046.8564224 m². The United States also kept a survey acre, based on a slightly different foot, which was larger by about four parts in a million — a difference of some 160 cm² in an acre, invisible except in large land surveys. That survey foot was formally retired at the end of 2022, so only one acre is now in use.
Is the answer exact?
Where both units are defined in terms of one another by whole numbers, yes — the page says so above the figure, and the only rounding is in how many digits are shown. Where the ratio has no finite decimal, the page shows twelve significant digits and says the relation is approximate rather than pretending otherwise.
Does anything I type leave my device?
No. The arithmetic runs in your browser; nothing is uploaded and there is no server to upload it to. Load the page once and it keeps working with the network switched off.
From the hectare to the acre: land as the world writes it
If you grew up with metric maps, a hectare feels like a natural size: a square of 100 metres, easy to pace out. Then you read an American farm report, a British planning notice or an Australian station sale, and every area is in acres. To convert ha to acres you multiply by 2.471, which sounds easy until you do it on a figure like 38.6 ha or 1,250 ha. This page does the multiplication as you type, and the text below explains why the two units differ, where each one is at home, and how to avoid the mistakes that turn up when areas change language.
You will find the rule with examples, profiles of both units, a comparison, a long list of real situations from national parks to greenhouses, and a short list of the errors that cost people money. The converter itself runs in your browser and sends nothing anywhere.
How to convert ha to acres: multiply by 2.471
The rule
One hectare is 2.471053815 acres. To convert ha to acres, multiply the hectares by 2.471. Two hectares are 4.94 acres, ten are 24.71 and a hundred are 247.1. The reverse is just as short: one acre is 0.4047 hectares, so divide acres by 2.471.
Worked examples
A plot of 3.2 ha is 7.91 acres. A farm of 48 ha is 118.6 acres. A forest of 1,250 ha is 3,088.8 acres. For a quick estimate, double the hectares and add half of the hectares again: 40 ha gives 80 plus 20, about 100 acres, and the exact answer is 98.8.
Small areas
A tenth of a hectare is 1,000 square metres, or 0.247 acres, nearly a quarter acre. Half a hectare is 1.236 acres. These are the sizes of typical house plots, and they are the figures most often misread when people move between systems.
A quick check
The acre is smaller than the hectare, so there are always more acres than hectares. If a “convert ha to acres” calculation gave you a smaller number, you divided by mistake.
The hectare
A square of one hundred metres
The hectare is 10,000 square metres, a square 100 metres by 100 metres. It was named in 1795 in revolutionary France, from hecto, a hundred, and are, the earlier unit of 100 square metres. It is not an official SI unit, but it is accepted for use with SI and is the standard for land in almost every country that uses the metric system.
Everyday picture
A hectare is a little more than a football pitch and a half. Farmers, foresters and planners think in hectares because the numbers are tidy when a field is described as 4.5 ha.
The acre
The day's work of a team of oxen
The acre equals 4,046.86 square metres, or 43,560 square feet. In medieval England it was the strip that a team of oxen could plough in a day, a furlong long and a chain wide. The modern value was fixed together with the yard and the pound in 1959.
Where it lives
It is the land unit of the United States, the United Kingdom, Ireland and several Commonwealth countries. Deeds, maps, taxes and farm sales still use it.
Hectare and acre compared
A hectare holds about two and a half acres. That ratio, 2.471, is not a round number, which is why mental conversion is rarely exact. For rough work you can say a hectare is two and a half acres; for contracts, use the full factor.
The hectare suits scientific and administrative work, because it is exactly 100 by 100 metres and fits the metric system. The acre suits habit and law in the countries that kept it. Most mistakes happen when a figure in one unit is read as if it were in the other, which is why labels matter.
Where the conversion appears
National parks and reserves
Yellowstone is 898,000 ha, which is 2.2 million acres. Kruger National Park covers about 1.95 million ha, 4.8 million acres. Danube Delta reserve, about 580,000 ha, is nearly 1.4 million acres. Travel writers use whichever unit their readers know, so a visitor often needs a “convert ha to acres” calculation to compare parks.
Cities and small states
The Vatican covers 44 ha, or 109 acres. Monaco is 202 ha, 499 acres. Central Park in New York is 341 ha, 843 acres. Seen in the same unit, the Vatican is smaller than the park.
Farm reports and prices
A European farm of 17 ha is 42 acres. An American average farm of 187 ha is 463 acres. Price lists in euros per hectare must be divided by 2.471 to compare with dollars per acre.
Disney World and big attractions
Walt Disney World in Florida occupies about 10,000 ha, roughly 25,000 acres, almost twice the area of Manhattan. Theme parks are described in acres in the United States, so a reader abroad who sees 25,000 acres can divide by 2.471 to get 10,100 ha. A “convert ha to acres” calculation shows just how large a resort is.
Spreadsheet use
Put hectares in column A and write =A2*2.471053815 in column B. Format with one or two decimals. For a list of parcels, add a total at the bottom and compare it to the registered area. If the totals disagree, look for a parcel that was entered in acres by mistake.
Aerial and drone surveys
Drone mapping software reports area in hectares or acres depending on settings. A survey of 12.5 ha covers 30.9 acres. Pilots who cross borders should set the units to match the client, then verify one result by hand with a “convert ha to acres” calculation. The same flight can then be reported to both sides without ambiguity.
Soil sampling
Agronomists take one composite sample for every 2 to 4 ha, which is 5 to 10 acres. A farm of 60 ha therefore needs 15 to 30 samples. Laboratories in different countries use different units for recommendations, so a report that says 5 acres per sample is the same as 2 ha per sample.
Leasing and rents
A rent of 300 euros per hectare is 121 euros per acre. A rent of 150 dollars per acre is 371 dollars per hectare. When you lease land abroad, convert both the price and the area, then compare. A table with both columns helps you see the real cost.
Teaching the conversion
Mark a square of 100 metres on a field for a hectare, then a rope of 63.6 metres for an acre, and let students stand inside both. They will see that the hectare is a little more than two and a half times bigger. The factor 2.471 is easier to remember after that.
Rounding rules
For large areas use one decimal, as in 247.1 acres. For small plots use three, as in 0.247 acres for a tenth of a hectare. Do not round the factor to 2.5 in legal documents, because on 1,000 ha the error is 29 acres. Use the full 2.471053815.
Reading old maps and deeds
Old British deeds mention acres, roods and perches. One rood is a quarter of an acre, 0.1012 ha, and one perch is 25.29 square metres. If you want a “convert ha to acres” calculation for a historical plot, convert roods and perches to acres first, then multiply the total by 0.4047.
City planning and housing density
Planners compare housing density as dwellings per hectare in Europe and dwellings per acre in the United States. A neighbourhood of 40 homes per hectare has 16.2 homes per acre, a figure that sounds quite low to a European and fairly dense to an American suburb. When a city report cites a foreign benchmark, the first thing to check is the unit, and the second is the arithmetic of a “convert ha to acres” calculation.
Fishing lakes and fish farms
A fish farm pond of 3 ha has 7.4 acres of surface. Stocking guides give fish per hectare in most countries and fish per acre in North America, so a farmer reading both must convert the density too. A pond of 2 ha stocked with 5,000 carp per hectare holds 10,000 fish, or about 2,000 per acre.
Airports and runways
An airport of 1,000 ha is 2,471 acres, about the same as a mid sized university town. The land includes runways, taxiways, terminals and noise buffers. Airports in North America are described in acres, those in Europe in hectares, and cargo hubs often show both on their planning documents.
Chernobyl exclusion zone
The exclusion zone around Chernobyl covers about 260,000 ha, which is 642,000 acres. News reports use square kilometres or hectares in Europe and square miles or acres in the United States. A reader comparing two articles will need to convert, and a figure of 2,600 square kilometres is the same as 260,000 ha.
Hospitals, campuses and barracks
A military base of 6,000 ha has 14,826 acres. A hospital campus of 25 ha has 62 acres. Public buildings are listed in the unit of the country that owns them, and reports for foreign partners often include both figures in brackets.
Why accuracy matters on large sites
On small plots a rounding error is tiny, but on large sites it grows. If you use 2.5 instead of 2.471 on 8,000 ha, you overstate the area by 232 acres, which is more than a typical city park. For anything legal or financial, keep the full factor and let the converter do the work.
Gardens, parks and nature in everyday talk
When a newspaper says a new park is "the size of 20 football fields", that is about 14 ha or 35 acres. Journalists use football pitches because they work in both systems, but each pitch is 0.714 ha, and the arithmetic is easy to do on the page. If the story uses both hectares and acres, check that the two figures agree.
A short history of land measurement
People measured land by what they could work: the acre by a day of ploughing, the Roman jugerum by the area a yoke of oxen could plough in a day, the German morgen by a morning's work. The French Revolution replaced such variable units with fixed ones based on the metre, and the hectare was the result. English-speaking countries kept the old units, and that explains why a “convert ha to acres” calculation is needed at all.
Summary table for memory
Remember a few anchors: 1 ha is 2.47 acres, 5 ha is 12.4 acres, 10 ha is 24.7 acres, 50 ha is 123.6 acres and 100 ha is 247.1 acres. Between these anchors you can interpolate, and a glance at the converter above will confirm the exact value.
Olive groves and vineyards
Spain has about 2.7 million ha of olive groves, which is 6.7 million acres. France has about 800,000 ha of vineyards, 1.98 million acres. Statistics from the International Organisation of Vine and Wine are in hectares, while American trade papers quote acres. A producer who sells abroad should keep both figures in the same table.
Greenhouses of Almeria
The greenhouses of southern Spain cover roughly 30,000 ha, about 74,000 acres, visible from space as a sea of white plastic. The area is smaller than the olive groves but produces vegetables all year. Pictures of the region are often captioned in hectares, and a visitor from North America will look for the “convert ha to acres” calculation.
Cattle stations in Australia
Anna Creek Station in South Australia once covered about 2.4 million ha, which is nearly 6 million acres, larger than Israel. Australian stations are described in hectares or square kilometres, and sale notices abroad convert to acres to attract buyers. When a number has seven digits, an error of one decimal place is an error of millions of acres.
Reforestation targets
Governments announce planting targets in hectares: one million hectares of new forest is 2.47 million acres. A programme of 50,000 ha per year equals 123,500 acres. Reports from international bodies use both units, and the numbers become easier to compare when you fix one unit throughout.
Rice paddies and tea estates
An Indian tea estate of 500 ha has 1,236 acres. A rice farm of 2 ha, typical in Asia, is 4.9 acres. Smallholder farms are measured in hectares in the producing countries, while trade publications from the United States and Britain still quote acres. Whenever you read of yields per acre, convert both numbers before comparing.
Wind and solar
A wind farm of 120 ha is 296 acres. A solar farm of 200 ha is 494 acres. Developers from different countries may submit the same plan in two units, and local authorities may ask for both. Keeping a conversion table in the project folder avoids misunderstandings.
Data centres and industrial parks
A logistics park of 80 ha is 198 acres. A data centre campus of 30 ha is 74 acres. Planners in Europe use hectares for zoning, while developers from America describe sites in acres. If you receive a brochure in one unit and a permit in the other, check they refer to the same plot.
More values for convert ha to acres
A longer list of conversions
If the value you need is not in the first list, these further conversions may be close enough to read off directly:
- 0.1 ha = 0.247105 ac
- 0.5 ha = 1.23553 ac
- 3 ha = 7.41316 ac
- 4 ha = 9.88422 ac
- 7 ha = 17.2974 ac
- 15 ha = 37.0658 ac
- 20 ha = 49.4211 ac
- 75 ha = 185.329 ac
- 200 ha = 494.211 ac
- 500 ha = 1,235.53 ac
- 2,000 ha = 4,942.11 ac
- 10,000 ha = 24,710.5 ac
Mistakes when you convert ha to acres
Dividing instead of multiplying
An acre is smaller than a hectare, so the number of acres is bigger. If 10 ha became 4.05, you used the wrong direction.
Confusing square miles
A square mile is 259 ha or 640 acres. Make sure you do not read a square mile figure as acres.
Rounding the factor
Use at least four digits of 2.4711 in any serious calculation.
Quick answers
How many acres in a hectare?
About 2.471.
How do I convert ha to acres?
Multiply by 2.471.
How many hectares in an acre?
0.4047.
What is 50 ha in acres?
123.55 acres.
Does my number leave my device?
No. The calculation runs in your browser.
Related pages and a last word
If you work with land and area, these conversions are close at hand: Convert ha to m², Convert ha to km², Convert m² to acres, Convert mi² to acres, Convert acres to m², Convert km to mi, Convert mi to km, Convert °C to °F, Convert °F to °C. The reverse of this page is Convert acres to ha.
In short, to convert ha to acres multiply by 2.471, remember that an acre is smaller than a hectare, and keep the full factor for contracts. Your number stays on your device: nothing is uploaded and no account is needed.