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Mathematics & calculation

Convert hectares to acres (and acres to hectares)

Hectares ↔ acres converter in both directions: definition of the hectare and the international acre, exact factor 1 acre = 0.40468564224 ha, formula, mental-math shortcut and real examples (farm, city park, US land listing).

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Conversion table

ha to ac conversion
haac
1 ha2.47105 ac
2 ha4.94211 ac
5 ha12.3553 ac
10 ha24.7105 ac
20 ha49.4211 ac
50 ha123.553 ac
100 ha247.105 ac
1,000 ha2,471.05 ac
ac to ha conversion
acha
1 ac0.4047 ha
2 ac0.8094 ha
5 ac2.02343 ha
10 ac4.04686 ha
20 ac8.09371 ha
50 ac20.2343 ha
100 ac40.4686 ha
1,000 ac404.686 ha

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How does this tool work?

This converter turns hectares into acres and acres into hectares: type an area in either field and the other updates instantly. Use it to compare farmland, a vineyard or a forest described in the other unit, to read a US or UK land listing, or to translate the size of a park or an estate.

The hectare is a unit of area accepted for use with the SI: 1 ha = 10,000 m², a square 100 m on each side. The international acre is exactly 4,046.8564224 m², or 43,560 square feet (one chain by one furlong, 66 ft × 660 ft), following the 1959 international yard and pound agreement (1 yd = 0.9144 m). So 1 acre = 0.40468564224 ha and 1 ha ≈ 2.471054 acres.

To go from hectares to acres, multiply by 2.471054; to go from acres to hectares, multiply by 0.404686 (or divide by 2.471054). Both fields stay in sync, and the swap button reverses the direction without losing the value you typed.

For a quick mental estimate, multiply hectares by 2.5 and take off 1%: 20 ha ≈ 50 acres − 0.5 = 49.5 (exact value 49.42). In the other direction, multiply acres by 0.4: 100 acres ≈ 40 ha (exact 40.47). An acre is roughly 40% of a hectare, or about three quarters of an American football field including end zones.

Do not confuse the acre with the are, which is 100 m² (1 ha = 100 ares), nor with the US survey acre, very slightly larger (4,046.8726 m²) and being phased out. Also remember that a square mile is 640 acres, about 259 ha, and a square kilometre is 100 ha, or 247.1 acres.

How to use this tool

  1. Type an area

    In the Hectares or the Acres field; decimals are accepted, including for small plots.

  2. Read the conversion

    The other field recalculates on every keystroke with the exact international acre factor.

  3. Use the table

    The table under the converter lists common areas in both directions, handy to spot an order of magnitude without any calculation.

Hectares ↔ acres conversion formulas

The international acre follows exactly from the foot and the yard, and therefore from the metre.

Hectares to acres

acres = ha × 10,000 ÷ 4,046.8564224 ≈ ha × 2.471054

The 2.471054 factor is rounded to the millionth.

Acres to hectares

ha = acres × 0.40468564224

Exact factor, from 1 acre = 43,560 ft² and 1 ft = 0.3048 m.

Origin of the acre

1 acre = 43,560 ft² × (0.3048 m)² = 4,046.8564224 m²

One chain (66 ft) times one furlong (660 ft).

ha
area in hectares (1 ha = 10,000 m²)
acres
area in international acres (1 acre = 43,560 ft²)

Example: 12.5 ha = 12.5 × 2.471054 ≈ 30.89 acres.

Use cases

Farming and land

Compare a farm, a vineyard or a forest plot described in hectares with a listing in acres.

Property abroad

Gauge the size of a lot or ranch for sale in the UK, the US, Canada or Australia.

Planning and environment

Set the area of a park, a nature reserve or a project against English-language sources.

Reading reports

Make deforestation, crop or conservation statistics comparable when published in either unit.

Examples

One hectare in acres

10,000 ÷ 4,046.8564 ≈ 2.4711 acres.

Input

1 ha

Result

2.4711 acres

Grain farm

50 × 2.471054 ≈ 123.55 acres, a small farm in Western Europe.

Input

50 ha

Result

123.55 acres

Quarter section of land

160 × 0.404686 ≈ 64.75 ha; a quarter section (160 acres) is a classic US homestead parcel.

Input

160 acres

Result

64.75 ha

Area of Central Park in New York

843 × 0.404686 ≈ 341.15 ha, or 3.41 km².

Input

843 acres

Result

341.15 ha

One square mile

640 × 0.404686 = 258.999 ha, almost exactly 259 hectares.

Input

640 acres

Result

259 ha

Tips and best practices

  • Anchor points: 1 ha ≈ 2.47 acres and 1 acre ≈ 0.405 ha.
  • 10 acres is about 4 ha, and 100 hectares is about 247 acres.
  • A hectare is a 100 m square; an acre is a 66 ft by 660 ft rectangle, equal to a square of about 63.6 m on each side.
  • For small areas such as a garden, use the square meters ↔ square feet converter instead.
  • To check a conversion, convert back: you should land on your starting value.

Sources and references

Frequently asked questions

How many acres are in a hectare?

One hectare is about 2.471054 acres (10,000 m² ÷ 4,046.8564 m²).

How many hectares are in an acre?

One acre is exactly 0.40468564224 ha, or 4,046.8564 m², a little under half a hectare.

How do you convert hectares to acres?

Multiply hectares by 2.471054. For example, 10 ha is 24.71 acres and 250 ha is 617.76 acres.

How do you convert acres to hectares?

Multiply acres by 0.404686. For example, 100 acres is 40.47 ha and 1,000 acres is 404.69 ha.

What is the difference between an acre, an are and a hectare?

The are is 100 m², the hectare 10,000 m² (100 ares) and the acre 4,046.86 m². A hectare therefore holds about 2.47 acres, and an acre about 40.5 ares.

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