Convert Acres (ac) to Hectares (ha)

1 ac = 0.405 ha

How many Hectares in a Acre?Printable chart →

Acres and hectares are the two most common units for measuring large land areas. One acre equals approximately 0.404686 hectares, while one hectare equals about 2.471 acres. This conversion is indispensable for real estate, agriculture, land surveying, and understanding property sizes across countries that use different measurement systems.

Acre (ac)

Hectare (ha)

0.404686

≈ 13/32 ha

Conversion Formula

hectares = acres × 0.404686

Reverse: acres = hectares × 2.47105

Quick mental math: Multiply by 0.4

Conversion Examples

1 ac × 0.404686 =

0.405 ha

1 Acres = 0.405 Hectares

5 ac × 0.404686 =

2.023 ha

5 Acres = 2.023 Hectares

10 ac × 0.404686 =

4.047 ha

10 Acres = 4.047 Hectares

25 ac × 0.404686 =

10.117 ha

25 Acres = 10.117 Hectares

50 ac × 0.404686 =

20.234 ha

50 Acres = 20.234 Hectares

100 ac × 0.404686 =

40.469 ha

100 Acres = 40.469 Hectares

Acre to Hectare Table

Quick convert your value:

ac =—ha

Start:Step:Rows:Precision:

Acre (ac)	Hectare (ha)	Fraction
1	0.4047	13/32
2	0.8094	13/16
3	1.2141	1 7/32
4	1.6187	1 5/8
5	2.0234	2 1/64
6	2.4281	2 27/64
7	2.8328	2 53/64
8	3.2375	3 15/64
9	3.6422	3 41/64
10	4.0469	4 3/64
11	4.4515	4 29/64
12	4.8562	4 55/64
13	5.2609	5 17/64
14	5.6656	5 43/64
15	6.0703	6 1/16
16	6.475	6 15/32
17	6.8797	6 7/8
18	7.2843	7 9/32
19	7.689	7 11/16
20	8.0937	8 3/32

Unit Definitions

What is a Acre (ac)?

ImperialUnited States, United Kingdom

An acre is a unit of land area in the imperial and US customary systems, equal to 43,560 square feet or approximately 4,046.86 square meters.

History

The acre originated in medieval England as the amount of land a yoke of oxen could plow in one day. The word comes from the Old English 'aecer,' meaning open field. Over centuries, the acre was standardized and eventually defined precisely as 43,560 square feet. Unlike many imperial units, the acre does not have a simple relationship to other length units.

Current Use

Acres are used primarily in the United States, United Kingdom, and other countries with British colonial heritage for measuring land area. They are standard in real estate listings, agricultural reports, and forestry in these regions.

Learn more about Acre

What is a Hectare (ha)?

Metric (SI)Worldwide

A hectare is a metric unit of area equal to 10,000 square meters (100m × 100m) or approximately 2.471 acres. It is widely used for measuring land area.

History

The hectare was introduced as part of the metric system in France in 1795 during the French Revolution. The word combines 'hecto' (hundred) with 'are' (a unit of 100 square meters), so a hectare literally means 100 ares. Although not an SI base unit, the hectare is accepted for use with the SI and is recognized by the International Bureau of Weights and Measures.

Current Use

Hectares are the standard unit for land measurement in most countries worldwide. They are used in agriculture, forestry, urban planning, and environmental science. The European Union, Australia, and most of Asia, Africa, and South America use hectares for official land records.

Learn more about Hectare

Frequently Asked Questions

How many hectares are in 1 acre?

One acre is equal to approximately 0.404686 hectares. This means an acre is slightly less than half a hectare. To convert any number of acres to hectares, multiply by 0.404686. For example, 5 acres equals approximately 2.023 hectares. This conversion is commonly used in international real estate, farming, and land management contexts.

What is bigger, an acre or a hectare?

A hectare is larger than an acre. One hectare equals approximately 2.471 acres, meaning a hectare is about 2.5 times the size of an acre. To visualize: an acre is about 4,047 square meters (roughly the size of a football field without end zones), while a hectare is 10,000 square meters (about 2.5 football fields). The hectare is the more commonly used unit internationally for large-scale land measurement.

How big is one acre in square feet and square meters?

One acre equals 43,560 square feet or approximately 4,046.86 square meters. To visualize, an acre is roughly 208.7 feet by 208.7 feet if square, which is about 90% the size of a standard American football field (including end zones). An acre was historically defined as the amount of land a yoke of oxen could plow in one day, though modern definitions are based on precise square footage.

How do I convert acres to hectares for farmland?

To convert farmland measurements from acres to hectares, multiply the number of acres by 0.404686. For example, a 160-acre farm (a quarter section, common in the US Midwest) equals approximately 64.75 hectares. For large agricultural operations, a quick approximation is to multiply acres by 0.4 and add 1% for greater accuracy. This conversion is important for comparing farm sizes, crop yields, and agricultural statistics internationally.

Why do some countries use acres and others use hectares?

Hectares are used by most countries as part of the metric system, which is the international standard for measurement. Acres are primarily used in the United States, United Kingdom, and some Commonwealth countries as a legacy of the imperial measurement system. The acre has historical roots in English farming culture, while the hectare was introduced with the metric system in 1795. In the UK, both units may be used depending on context, with hectares becoming more common in official and scientific usage.

Popular Area Conversions

Square Meter to Square Footm² → ft² Square Foot to Square Meterft² → m² Hectare to Acreha → ac Square Kilometer to Hectarekm² → ha Acre to Square Meterac → m²

Convert Acre to Other Units

Acre to Square Meter→ m² Acre to Square Kilometer→ km² Acre to Square Kilometer→ km² Acre to Square Foot→ ft² Acre to Square Inch→ in² Acre to Square Yard→ yd² Acre to Square Mile→ mi² Acre to Square Centimeter→ cm²

Related Conversions

Meter to Footm → ft Centimeter to Inchcm → in Kilogram to Poundkg → lbs