Acres to Hectares Converter
1 acre = 0.404686 hectares
Converting acres to hectares is a fundamental task in surface area measurement. The acre originated in medieval England as the amount of land a yoke of oxen could plow in a day. Today, 1 ac equals 0.404686 ha, and this conversion is commonly needed in real estate and agriculture.
Did you know? Did you know? A standard soccer pitch is about 0.7 hectares. The hectare is primarily used for agriculture (farm sizes), forestry, urban planning, and land surveying, while the acre is standard for real estate listings, farming, and land use planning in the US and UK.
Conversion Formula
hectares = acres x 0.404686
To convert acres to hectares, multiply by 0.404686. One acre is defined as 4,046.8564224 m2, and 1 hectare is 10,000 m2, so 4,046.86 / 10,000 = 0.404686.
Acres to Hectares Table
| Acres (ac) | Hectares (ha) |
|---|---|
| 1 | 0.404686 |
| 2 | 0.809371 |
| 5 | 2.02343 |
| 10 | 4.04686 |
| 40 | 16.1874 |
| 100 | 40.4686 |
| 160 | 64.7497 |
| 500 | 202.343 |
| 640 | 259 |
| 1000 | 404.686 |
About Acres to Hectares
Converting acres to hectares is important for international land transactions, agricultural reporting, and comparing property sizes across countries.
In the US, a standard city lot is typically 0.1-0.25 acres (0.04-0.1 hectares). Suburban residential lots range from 0.25 to 1 acre (0.1-0.4 hectares). A "section" of land in the US survey system is 640 acres (259 hectares), and a "quarter section" homestead is 160 acres (64.75 hectares).
Agricultural conversions matter for yield comparisons. If US corn yields 180 bushels per acre, that's roughly 445 bushels per hectare. Global crop reports from the FAO use hectares, while USDA reports use acres, requiring constant conversion.
Major land areas in acres convert as follows: the White House grounds cover 18 acres (7.28 hectares). A US football field (including end zones) is about 1.32 acres (0.534 hectares). The Pentagon building sits on 29 acres (11.7 hectares). Disney World in Florida spans 25,000 acres (10,117 hectares).
For the quick mental calculation, multiply acres by 0.4 for a rough estimate. So 100 acres is about 40 hectares (actual: 40.47), and 250 acres is roughly 100 hectares (actual: 101.2).
Frequently Asked Questions
How many hectares in 1 acre?
1 acre equals 0.4047 hectares. You need about 2.47 acres to make 1 hectare.
How big is an acre in visual terms?
An acre is about 4,047 m2, roughly 90% of a football field (without end zones), or about 208.7 feet x 208.7 feet (63.6 x 63.6 meters).
How many acres in a square mile?
There are 640 acres in 1 square mile. This is the basis of the US Public Land Survey System, where a "section" is 1 square mile.
What is a hectare vs an acre for farming?
A hectare (10,000 m2, about 2.47 acres) is the standard metric land measure used globally. An acre (4,047 m2) is used in the US, UK, and some former British colonies. Most international agricultural data uses hectares.