Hectares to acres

Type a plot area and pick hectares or acres. The international acre is 4046.8564 m² at the 0.3048 m foot. 1 ha is 2.4711 ac, not the US survey acre.

Plot area. Floor: square meters and square feet.

Inputs

Result

Enter a value. The result shows up here.

How it works

A hectare is 10,000 m², or 100 ares. The international acre is 43,560 ft² at the 0.3048 m foot, so 4046.8564224 m². 1 ha is 2.471053815 ac, 2.4711 ac on the page. Half a hectare is 1.2355 ac. A 2 ac plot is 0.8094 ha. 1 acre back is 0.4047 ha. 10 ha of woods is 24.7105 ac. 5 ha of farm is 12.3553 ac. 100 ha is 247.1054 ac. A quarter acre under a house is 0.1012 ha.

Land records in metric countries write ha; US listings write acres. Type 1 and leave hectares when that is what the extract says. Half a hectare of garden is 0.5. Two acres of a homestead compare with 0.8094 ha before you sign in the other unit.

Pick the direction from the list: hectares to acres or acres to hectares. A comma and a period both work. Typed zero is allowed. A minus is rejected. The switch sets ha or ac on an empty field and does not rewrite a typed 1.

A floor in m² is on the neighbouring page. Here it stays a field larger than a room. Type 0.01 ha when you have 1 are, because 1 are = 100 m².

The old US survey acre is not in this card. The calculator does not know plot boundaries. It converts one area. A 4000 m² shortcut understates the acre: an acre is 4046.8564 m².

Hectare and acre are a plot, not a studio. Open 50 m² of floor on the m² and ft² page, not as 0.005 ha, unless you really mean land.

How to use

  1. Type a plot area, for example 1 or 2.
  2. Pick hectares to acres or acres to hectares.
  3. Click Calculate. 1 ha gives 2.4711 ac. 0.5 ha gives 1.2355 ac.
  4. A hectare is 10,000 m². A US acre is 4,046.8564 m². A flat is in m², not here.
  5. For a floor, open m² and ft². Here it stays a plot.

Formula

ac = ha × (10,000 / 4046.8564224)

ha = ac × 0.40468564224

International acre, not US survey acre. 1 ha = 100 ares = 10,000 m².

ha and the international acre

Here 1 ha is 2.4711 ac. The international acre is 4046.8564 m² at the 0.3048 m foot, not the US survey acre.

ha
Hectare, 10,000 m². 1 × (10000 / 4046.8564224) ≈ 2.4711 ac. A hundred ares is that same hectare, not an acre.
ac
International acre on the list. 2.4711 from 1 ha. The other way, ac × 0.40468564224 returns hectares. Survey acre is not used here.

Real-life examples

Example 1

1 ha -> 2.4711 ac of field.

Example 2

1 ac -> 0.4047 ha of plot.

Example 3

0.5 ha -> 1.2355 ac of garden.

Example 4

10 ha -> 24.7105 ac of woodland.

Example 5

2 ac -> 0.8094 ha of homestead.

Example 6

5 ha -> 12.3553 ac of farm.

Example 7

100 ha -> 247.1054 ac of estate.

Example 8

0.25 ac -> 0.1012 ha under a house.

Ways to use this converter

  • You compare a 0.5 ha plot with a US listing in acres.
  • You convert 2 acres to hectares when the cadastre is metric.

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Frequently asked questions

How many acres is 1 hectare?

1 ha = 2.471053815 ac, 2.4711 ac on the page. 1 ac = 0.40468564224 ha, 0.4047 ha on the page, because an acre is 4046.8564224 m².

Is this the international acre?

Yes, 43,560 ft² at the 0.3048 m foot. The US survey acre is not used here.

How many ares is a hectare?

100 ares. 1 are = 100 m² = 0.01 ha. Type 0.01 when you have 1 are.

Can area be negative?

Zero hectares is allowed. A minus is usually a typing mistake.

How is this different from m² and ft²?

That page is a floor. This page is a plot in ha and ac. The factors differ.

How many ha are 2 acres and 5 ac?

2 ac is 0.8094 ha. 5 ac is about 2.0234 ha. A quarter acre is 0.1012 ha.

What does the header switch do?

On an empty field, metric sets ha and US sets ac. It does not rewrite a typed number.

How do I type half a hectare?

Type 0.5 or 0,5. Do not insert thousand separators. You get 1.2355 ac.

Is 1 acre 4000 m²?

An acre is 4046.8564 m². A 4000 m² shortcut understates the plot.

How many ac are 10 ha and 5 ha?

10 ha is 24.7105 ac. 5 ha is 12.3553 ac. 100 ha is 247.1054 ac.

Knowledge sources

The converter multiplies your number by an SI factor. NIST SP 330 and BIPM define the units, not your reading.

Page updated in 2026.