Acres to Hectares Converter

Convert acres to hectares instantly, with a reference table covering farmland, plots and estates.

Acres

Hectares

1 ac = 0.4047 ha

Multiply acres by 0.40468564 to get hectares.

The link carries the values you entered, so whoever opens it sees the same result. Nothing is stored on our side — the numbers travel in the link itself.

Acres to hectares reference table

The conversions people look up most often, rounded to 4 decimal places.

Common acres to hectares conversions
Acre (ac)	Hectare (ha)
0.25 ac	0.1012 ha
0.5 ac	0.2023 ha
1 ac	0.4047 ha
2 ac	0.8094 ha
5 ac	2.0234 ha
10 ac	4.0469 ha
20 ac	8.0937 ha
50 ac	20.2343 ha
100 ac	40.4686 ha
250 ac	101.1714 ha
500 ac	202.3428 ha
1,000 ac	404.6856 ha
2,471 ac	999.9782 ha

The acres people look up most

1 ac = 0.4047 ha: An acre was the area one man with one ox could plough in a day, which is why it is not a round metric number.
2 ac = 0.8094 ha: Smallholding size across much of Europe, where land is advertised in hectares and remembered in acres.
5 ac = 2.0234 ha: A useful anchor: two and a half acres is almost exactly one hectare.
10 ac = 4.0469 ha: Ten acres lands close to four hectares, which is why the pair shows up in so many listings.
15 ac = 6.0703 ha: Mid-size paddock and vineyard scale, where the buyer reads one unit and the seller quotes the other.
20 ac = 8.0937 ha: At this size most European land registries will list hectares and nothing else.
40 ac = 16.1874 ha: A quarter of a quarter-section under the US Public Land Survey, which is why 40 acres recurs in American deeds.
50 ac = 20.2343 ha: Round in acres, awkward in hectares - which is why this gets searched rather than remembered.

How the acres to hectares calculation works

An acre is exactly 0.40468564224 hectares:

hectares = acres × 0.404686

An acre was originally the area a man with an ox could plough in a day — a furlong long by a chain wide, which is 660 by 66 feet, or 43,560 square feet. A hectare is far tidier: 100 m by 100 m, or 10,000 square metres.

The useful anchor is that one hectare is about 2.47 acres, so a hectare is roughly two and a half acres.

Common holdings:

0.25 acres (a suburban US lot) → 0.101 ha
1 acre → 0.405 ha
10 acres → 4.047 ha
100 acres → 40.47 ha
640 acres (a US survey section, one square mile) → 258.999 ha

Where the unit matters. UK and Irish farmland is still traded in acres despite metric being official, while EU agricultural subsidies and land registries work in hectares — so the same field routinely has two numbers attached to it. Australian and New Zealand rural property is quoted in hectares; American farmland almost always in acres.

A useful mental picture: a football pitch is about 1.76 acres or 0.71 ha, and an American football field including end zones is 1.32 acres or 0.535 ha. Neither is a hectare, though the pitch is closer than most people guess.

To convert back, multiply hectares by 2.47105.

Frequently asked questions

What are the roods and perches in an old deed?

The old subdivisions of the acre. Four roods make an acre and forty square perches make a rood, so a perch is 30.25 square yards, or 25.29 m². A deed reading 2a 1r 12p means 2 acres, 1 rood and 12 perches - 2.325 acres, or 0.941 hectares. Irish and Scottish deeds used their own larger acres before the nineteenth century, so a very old figure may not be this acre at all.

Does an acre have to be a particular shape?

No - it is 4,046.86 m² however it is arranged, and the shape decides what it costs to fence. A square acre is about 63.6 m on a side and needs 254 m of fencing; the original strip, a furlong by a chain, is 201 by 20 m and needs 443 m. If you are costing a boundary, convert the dimensions rather than the area.

How do I convert a housing density quoted per hectare?

Divide rather than multiply, which is the step most people miss. Planning density is quoted per hectare in Britain and per acre in America, so a typical suburban 30 dwellings per hectare is 12 per acre, and a US subdivision at 4 houses per acre is 9.9 per hectare. The rate moves the opposite way to the area it is measured over.

Acres to Hectares Converter