Acres to Hectares

1 ac = 0.4046856 ha

Acres to hectares is used by farmers, land buyers, and planners translating US or UK land areas into the metric unit used for agriculture in most of the world. Hectares are standard in farm statistics, subsidies, and land registries in many countries.

From

When you need to convert acres to hectares

Comparing a US farm or ranch size with metric agricultural statistics
Converting UK land listings for international buyers
Calculating fertilizer or seed rates given per hectare
Reporting forest or conservation areas in metric units

How to convert acres to hectares

ha = ac × 0.4046856

Example: 5 ac = 2.023428 ha

Common land areas

Acres (ac)	Hectares (ha)
0.25 ac	0.1011714 ha
0.5 ac	0.2023428 ha
1 ac	0.4046856 ha
2 ac	0.8093713 ha
5 ac	2.023428 ha
10 ac	4.046856 ha
40 ac	16.18743 ha
100 ac	40.46856 ha
160 ac	64.7497 ha
640 ac	258.9988 ha

Tips for converting acres to hectares

One international acre is exactly 4,046.8564224 m², and a hectare is 10,000 m². Multiplying by 0.4 is within about 1.5%.
For precise figures, multiply by 0.404686.
One acre is 43,560 square feet; US land surveys may use the US survey acre, which is very slightly larger.

Acres to Hectares conversion table

Acres (ac)	Hectares (ha)
1 ac	0.4046856 ha
2 ac	0.8093713 ha
3 ac	1.214057 ha
4 ac	1.618743 ha
5 ac	2.023428 ha
6 ac	2.428114 ha
7 ac	2.832799 ha
8 ac	3.237485 ha
9 ac	3.642171 ha
10 ac	4.046856 ha
15 ac	6.070285 ha
20 ac	8.093713 ha
25 ac	10.11714 ha
30 ac	12.14057 ha
40 ac	16.18743 ha
50 ac	20.23428 ha
75 ac	30.35142 ha
100 ac	40.46856 ha
250 ac	101.1714 ha
500 ac	202.3428 ha
1,000 ac	404.6856 ha

About the units

Acres: The acre is an imperial and US customary unit of land area equal to 43,560 square feet, or about 4,046.86 square meters.

Hectares: The hectare is a metric unit of area equal to 10,000 square meters (a 100 m × 100 m square), commonly used for farmland and forests.

Frequently asked questions

How many hectares are in 1 acre?

1 acre equals 0.4046856 hectares.

How many acres are in 1 hectare?

1 hectare equals 2.471054 acres.

How do I convert acres to hectares?

Use the formula ha = ac × 0.4046856.

What is 10 acres in hectares?

10 acres equals 4.046856 hectares.

Related conversions

Factors: NIST SP 811 · SI Brochure · NIST Handbook 44 — Updated October 17, 2026