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Area conversion

Acres to Hectares (ac to ha)

1 ac = 0.4047 ha — multiply the number of acres by 0.4047.

All units & categories

Acres to Hectares conversion chart

acres hectares
1 ac 0.4047 ha
2 ac 0.8094 ha
3 ac 1.2141 ha
4 ac 1.6187 ha
5 ac 2.0234 ha
6 ac 2.4281 ha
7 ac 2.8328 ha
8 ac 3.2375 ha
9 ac 3.6422 ha
10 ac 4.0469 ha
12 ac 4.8562 ha
15 ac 6.0703 ha
18 ac 7.2843 ha
20 ac 8.0937 ha
25 ac 10.1171 ha
30 ac 12.1406 ha
40 ac 16.1874 ha
50 ac 20.2343 ha
60 ac 24.2811 ha
75 ac 30.3514 ha
100 ac 40.4686 ha

How to convert by hand

1 ac = 0.404685642 ha

Because this is a linear conversion, the ratio never changes: every acre is always 0.4047 ha, whatever the size of the number.

Worked example: 10 ac × 0.4047 = 4.0469 ha .

Related conversions

About acres and hectares

Area conversions turn up in property and land, where listings use square metres in one market and square feet or acres in another.

Acre

US / Imperial

43,560 square feet, about 0.4047 hectares.

Commonly used for: Farmland and land parcels in the US and UK.

Hectare

Metric

10,000 square metres — a square 100 m on each side.

Commonly used for: Farmland and land area in most of the world.

Questions

How many hectares are in one acre?

One acre equals 0.4047 ha. To convert any amount, multiply the number of acres by 0.4047.

What is 5 ac in ha?

5 ac = 2.0234 ha. Type any value into the converter above to get an exact answer.

How do I convert hectares back to acres?

Divide by 0.4047 instead of multiplying — or use our Hectares to Acres converter.

Is this converter accurate?

Yes. Linear conversions use the internationally agreed factors published by NIST (SP 811), and temperature conversions use the exact defining formulas. Calculations run at full double precision and are only rounded for display.

Need a different unit?

The full converter handles length, mass, volume, area, speed and temperature — with every metric and US/UK unit in one place.

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