Acres to Hectares
Need to convert acres to hectares? Multiply by 0.404686. Here is the formula and a reference chart for common land area conversions.
Formula
hectares = acres × 0.404686 acres = hectares × 2.47105 m² = acres × 4046.86
Quick reference chart
| From | To |
|---|---|
| 0.5 acre | 0.202 ha |
| 1 acre | 0.405 ha |
| 2 acres | 0.809 ha |
| 5 acres | 2.023 ha |
| 10 acres | 4.047 ha |
| 25 acres | 10.12 ha |
| 50 acres | 20.23 ha |
| 100 acres | 40.47 ha |
| 640 acres | 258.9 ha |
| 1 ha | 2.471 acres |
| 10 ha | 24.71 acres |
| 100 ha | 247.1 acres |
When you need acres to hectares
The most common reason to convert between acres and hectares is comparing land sizes across different countries. The UK, Ireland, and the US measure land in acres. Most of Europe, Australia, and Asia use hectares. If you are reading a property listing, agricultural report, or land registry document from a different country, this conversion comes up immediately.
One hectare is exactly 10,000 square metres — a 100m × 100m square. One acre is approximately 4,047 square metres, or about 40% of a hectare. A quick mental estimate: divide acres by 2.5 to get a rough hectare figure. For exact results, multiply by 0.404686.
In agriculture, farm sizes in the UK and US are quoted in acres, while EU subsidy schemes and international farming statistics use hectares. A 100-acre farm is roughly 40 hectares. Knowing the conversion lets you compare farm sizes in global agricultural reports or land sale listings across borders without confusion.
Land registry and planning documents in the UK sometimes mix both units. Golf courses are often described in acres internationally — 18-hole courses typically run 120–190 acres (49–77 hectares). National parks and forest areas are almost always quoted in hectares at the international level. The conversion factor of 0.404686 is exact and internationally standardised.
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Open Area Converter →Frequently asked questions
How many hectares is 1 acre?
1 acre equals 0.404686 hectares. To convert acres to hectares, multiply by 0.404686.
How many acres is 1 hectare?
1 hectare equals 2.47105 acres. A hectare is a 100m × 100m square (10,000 m²).
How big is an acre?
One acre is 4,046.86 square metres, or roughly the size of a football pitch. It is equivalent to 43,560 square feet or about 0.405 hectares.
How big is a hectare?
One hectare is exactly 10,000 square metres — a square 100m on each side. It equals 2.471 acres or 107,639 square feet. Hectares are the standard unit for land area in most countries.
How many acres in a square mile?
There are 640 acres in one square mile. One square mile equals 258.999 hectares or 2.590 km².
Which countries use acres vs hectares?
The US and UK traditionally use acres for land area, though the UK also uses hectares officially. Most other countries use hectares (part of the metric system). In agriculture and real estate, both units appear internationally.