Hectares to Acres Conversion (ha to ac)

Hectares to Acres Converter

Enter the area in hectares below to convert it to acres.

Result in Acres:

1 ha = 2.471054 ac

How to Convert Hectares to Acres

The fastest way to convert hectares to acres is to use this simple formula:

acres = hectares × 2.471054

The area in acres is equal to the area in hectares multiplied by 2.471054. Since one acre is equal to 2.471054 hectares^[1], that's the conversion ratio used in the formula.

For example, here's how to convert 5 hectares to acres using the formula above.

acres = (5 ha × 2.471054) = 12.355269 ac

conversion scale showing hectares and equivalent acres area values

How Many Acres Are in a Hectare?

There are 2.471054 acres in a hectare, which is why we use this value in the formula above.

1 ha = 2.471054 ac

Hectares and acres are both units used to measure area. Keep reading to learn more about each unit of measure.

What Is a Hectare?

One hectare is equal to 10,000 square meters,^[2] or the area of a square with 100 meter sides.

The hectare is an SI accepted unit for area for use with the metric system. In the metric system, "hecto" is the prefix for 10². Hectares can be abbreviated as ha; for example, 1 hectare can be written as 1 ha.

Learn more about hectares.

What Is an Acre?

One acre is defined as the area equal to a space that is one chain (66 ft) by one furlong (660 ft), or 10 square chains.^[3] That's equal to 43,560 square feet or 1/640 of a square mile for those unfamiliar with those units of measure.

illustration showing the size of an acre is a parcel of land that is 66 feet by 660 feet.

The acre is a US customary and imperial unit of area. Acres can be abbreviated as ac; for example, 1 acre can be written as 1 ac.

You can use an acreage calculator to measure the area of a plot of land in acres by locating the boundaries on a map.

Learn more about acres.

Hectare to Acre Conversion Table

Table showing various hectare measurements converted to acres.
Hectares	Acres
1 ha	2.4711 ac
2 ha	4.9421 ac
3 ha	7.4132 ac
4 ha	9.8842 ac
5 ha	12.36 ac
6 ha	14.83 ac
7 ha	17.3 ac
8 ha	19.77 ac
9 ha	22.24 ac
10 ha	24.71 ac
11 ha	27.18 ac
12 ha	29.65 ac
13 ha	32.12 ac
14 ha	34.59 ac
15 ha	37.07 ac
16 ha	39.54 ac
17 ha	42.01 ac
18 ha	44.48 ac
19 ha	46.95 ac
20 ha	49.42 ac
21 ha	51.89 ac
22 ha	54.36 ac
23 ha	56.83 ac
24 ha	59.31 ac
25 ha	61.78 ac
26 ha	64.25 ac
27 ha	66.72 ac
28 ha	69.19 ac
29 ha	71.66 ac
30 ha	74.13 ac
31 ha	76.6 ac
32 ha	79.07 ac
33 ha	81.54 ac
34 ha	84.02 ac
35 ha	86.49 ac
36 ha	88.96 ac
37 ha	91.43 ac
38 ha	93.9 ac
39 ha	96.37 ac
40 ha	98.84 ac

Table showing various hectare measurements converted to acres.

Hectares

Acres

1 ha

2.4711 ac

2 ha

4.9421 ac

3 ha

7.4132 ac

4 ha

9.8842 ac

5 ha

12.36 ac

6 ha

14.83 ac

7 ha

17.3 ac

8 ha

19.77 ac

9 ha

22.24 ac

10 ha

24.71 ac

11 ha

27.18 ac

12 ha

29.65 ac

13 ha

32.12 ac

14 ha

34.59 ac

15 ha

37.07 ac

16 ha

39.54 ac

17 ha

42.01 ac

18 ha

44.48 ac

19 ha

46.95 ac

20 ha

49.42 ac

21 ha

51.89 ac

22 ha

54.36 ac

23 ha

56.83 ac

24 ha

59.31 ac

25 ha

61.78 ac

26 ha

64.25 ac

27 ha

66.72 ac

28 ha

69.19 ac

29 ha

71.66 ac

30 ha

74.13 ac

31 ha

76.6 ac

32 ha

79.07 ac

33 ha

81.54 ac

34 ha

84.02 ac

35 ha

86.49 ac

36 ha

88.96 ac

37 ha

91.43 ac

38 ha

93.9 ac

39 ha

96.37 ac

40 ha

98.84 ac

References

National Oceanic and Atmospheric Administration, U.S. Coast Pilot 6, General Information, https://nauticalcharts.noaa.gov/publications/coast-pilot/files/cp6/CPB6_C01_WEB.pdf
Cambridge Dictionary, hectare, https://dictionary.cambridge.org/us/dictionary/english/hectare
National Institute of Standards and Technology, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, Handbook 44 - 2019 Edition, https://nvlpubs.nist.gov/nistpubs/hb/2019/NIST.HB.44-2019.pdf