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Acres to Hectares

1 acre = 0.40469 hectares · 1 ha = 2.4711 ac

1 acre = 0.40469 hectares

How it’s calculated

ha = ac × 0.4046856422

  • Multiply the value in acres by 0.4046856422.
  • To go back, divide by 0.4046856422 (or multiply by 2.471053815).
  • 1 ac = 0.4046856422 ha · 1 ha = 2.471053815 ac
Show worked solutionFactor, unit cancellation and rounding, step by step

  1. Find the conversion factor

    By definition 1 ac = 4046.8564224 m² and 1 ha = 10000 m², so 1 ac = 0.40468564224 ha. Source: NIST SP 811 / Handbook 44; BIPM SI Brochure (9th ed.).

  2. Multiply by the factor written as a fraction

    Put ac in the denominator so it cancels, leaving ha.

  3. Calculate (unrounded)

  4. Round the answer

    Rounded to 5 significant figures.

Answer: 0.40469 ha

1 ac in other units

Batch convert ac → ha
Results
  1. 1 ac = 0.40469 ha
  2. 5 ac = 2.0234 ha
  3. 10 ac = 4.0469 ha
  4. 25 ac = 10.117 ha

Permanent link to this conversion

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Quick examples

  • 1 acre = 0.40469 hectares
  • 5 acres = 2.0234 hectares
  • 10 acres = 4.0469 hectares
  • 25 acres = 10.117 hectares
  • 100 acres = 40.469 hectares

About these units

Acre (ac)

US & imperial (identical)

International acre, exactly 4 046.856 422 4 m² (43 560 ft²).

1 ac = 4046.856422 m²

Source: NIST SP 811 / Handbook 44

Hectare (ha)

metric (non-SI)

Exactly 10 000 m² (a square 100 m on each side).

1 ha = 10000 m²

Source: BIPM SI Brochure (9th ed.)

Acres to hectares conversion table

acre (ac) to hectare (ha)
Acres (ac)Hectares (ha)
0.1 ac0.040469 ha
0.5 ac0.20234 ha
1 ac0.40469 ha
2 ac0.80937 ha
3 ac1.2141 ha
4 ac1.6187 ha
5 ac2.0234 ha
6 ac2.4281 ha
7 ac2.8328 ha
8 ac3.2375 ha
9 ac3.6422 ha
10 ac4.0469 ha
15 ac6.0703 ha
20 ac8.0937 ha
25 ac10.117 ha
30 ac12.141 ha
40 ac16.187 ha
50 ac20.234 ha
75 ac30.351 ha
100 ac40.469 ha
250 ac101.17 ha
500 ac202.34 ha
1,000 ac404.69 ha

Related conversions

Frequently asked questions

How do I convert acres to hectares?

Use ha = ac × 0.4046856422. Multiply the value in acres by 0.4046856422.

How many hectares are in 1 acre?

1 acre (ac) equals 0.40469 hectares (ha); more precisely 0.4046856422.

How many acres are in 1 hectare?

1 hectare (ha) equals 2.4711 acres (ac); more precisely 2.471053815.

What is 10 ac in ha?

10 acres = 4.0469 hectares.

What is a acre?

International acre, exactly 4 046.856 422 4 m² (43 560 ft²).

What is a hectare?

Exactly 10 000 m² (a square 100 m on each side).

Formula: ha = ac × 0.4046856422. Factors last reviewed 2026-10-27.