# Acres to Hectares (ac to ha)

Source: https://www.unitconvertercalculator.com/area/acres-to-hectares/

**1 ac = 0.40468564224 ha**

One acre equals approximately 0.4047 hectares. To convert, multiply by 0.404686. Working the other direction, one hectare equals approximately 2.471 acres. The shortcuts worth memorising: one acre is about 0.4 hectares, and one hectare is about 2.5 acres. These two round-number approximations are accurate to about 1 percent and handle the vast majority of everyday agricultural and property comparisons.

The exact factor is 0.40468564224 hectares per acre, derived from one acre being 4,046.8564224 square meters and one hectare being exactly 10,000 square meters: 4,046.8564224 ÷ 10,000 = 0.40469.

This is the most important cross-system land area conversion for agriculture, conservation, and international real estate. The EU's Common Agricultural Policy, the UN Food and Agriculture Organization, the World Bank's agricultural statistics, and international carbon credit markets all use hectares as the standard land area unit. American agricultural data — farm sizes, crop areas, conservation easements, wildfire burn areas — is invariably in acres. Every international agricultural comparison requires this conversion.

A farm of 500 acres is 202.3 hectares. The average American farm of about 450 acres is about 182 hectares. The average European farm of about 17 hectares is about 42 acres. These conversions underpin every transatlantic agricultural policy comparison.

## Formula

Multiply the acre value by 0.404686

## Conversion Table

| Acres (ac) | Hectares (ha) |
|---|---|
| 0.25 ac | 0.10117141056 ha |
| 0.5 ac | 0.20234282112 ha |
| 1 ac | 0.40468564224 ha |
| 2 ac | 0.80937128448 ha |
| 2.471 ac | 0.99997822197504 ha |
| 5 ac | 2.0234282112 ha |
| 10 ac | 4.0468564224 ha |
| 20 ac | 8.0937128448 ha |
| 40 ac | 16.1874256896 ha |
| 50 ac | 20.234282112 ha |
| 100 ac | 40.468564224 ha |
| 160 ac | 64.7497027584 ha |
| 247 ac | 99.95735363328 ha |
| 500 ac | 202.34282112 ha |
| 640 ac | 258.9988110336 ha |
| 1000 ac | 404.68564224 ha |
| 5000 ac | 2023.4282112 ha |
| 10000 ac | 4046.8564224 ha |

## Units

### Acre (ac)

An imperial and US customary unit of area equal to 43,560 square feet or approximately 4,047 square meters. The traditional unit for measuring land in the United States, United Kingdom, and several other countries.

### Hectare (ha)

A metric unit of area equal to 10,000 square meters or 100 ares. The primary unit for measuring agricultural land, forests, and medium-sized land parcels worldwide. Accepted for use with the SI system.

## Background

International agricultural investment requires this conversion at every stage. American farmland investment funds reporting performance to European limited partners must express their portfolio in hectares. A fund holding 50,000 acres of Iowa cropland has 20,234 hectares — directly comparable with European farmland fund portfolios. Per-hectare farmland values in Iowa at around 2,000 dollars per acre are about 4,942 dollars per hectare, comparable with German farmland at 15,000 to 40,000 euros per hectare.

Carbon credit markets require hectares for international certification. American reforestation, grassland restoration, and wetland conservation projects that generate carbon credits for international markets must express their project area in hectares for Verra VCS, Gold Standard, and Article 6 Paris Agreement compliance. A 1,000-acre riparian buffer restoration project is 404.7 hectares of carbon sequestration area — the first calculation performed in every American carbon project's international certification process.

Wildfire damage reporting in international comparative studies converts American fire season data in acres to hectares. The 2020 US wildfire season burned about 10.1 million acres or 4.09 million hectares — comparable to Portugal's total land area (9.2 million hectares) being half consumed, a comparison that only becomes vivid in hectares for a European audience.

UN Food and Agriculture Organization agricultural census data uses hectares; USDA agricultural census data uses acres. Comparing US crop area statistics with FAO world crop data requires this conversion for every single crop and every year. A researcher comparing American and global soybean acreage uses this conversion hundreds of times in a single analysis.

## Good to Know

The most important agricultural cross-system conversion. The 0.4 / 2.5 shortcut pair (one acre ≈ 0.4 ha; one hectare ≈ 2.5 acres) is used daily in international farming, conservation, and carbon markets. Essential for anyone comparing US agricultural statistics with FAO global data, or American land investment with European benchmarks.

## FAQ

### How many hectares are in one acre?

Approximately 0.4047 hectares. One acre is 4,046.86 square meters, and one hectare is 10,000 square meters: 4,046.86 ÷ 10,000 = 0.40469. The shortcut: one acre is about 0.4 hectares.

### How many acres are in one hectare?

Approximately 2.471 acres. The reciprocal of 0.40469 is 2.4711. The shortcut: one hectare is about 2.5 acres — accurate to within 1.2 percent.

### What is the easiest way to convert?

Acres to hectares: multiply by 0.4 (exact is 0.4047, so this underestimates by 1.2%). Hectares to acres: multiply by 2.5 (exact is 2.471, so this overestimates by 1.2%). For official or financial calculations, use the exact 0.404686 multiplier. For farm gate conversations, the 0.4 and 2.5 shortcuts are universally accepted.

## Non-Frequently Asked Questions

### How many Eiffel Towers could fit in one acre, base-to-base?

The Eiffel Tower's base is about 125 × 125 meters = 15,625 square meters. One acre is 4,047 square meters. Not even one Eiffel Tower base fits in one acre — the base is nearly 4 times larger than one acre. You would need 3.86 acres to fit one Eiffel Tower footprint. This should recalibrate any intuition that acres are large.

### Is the 2.5 acres per hectare shortcut good enough for farmers?

Yes, universally. The exact 2.471 versus the approximate 2.5 creates an error of 1.2 percent — for a 100-hectare farm, the approximation gives 250 acres when the true figure is 247.1 acres. A difference of 2.9 acres on a 247-acre farm is less than 1.2 percent — well within the measurement uncertainty of any field estimate. Farm gate conversations use 2.5 without apology.

### How many football pitches is one hectare?

A standard FIFA pitch is 68×105 = 7,140 square meters. One hectare is 10,000 square meters. One hectare is 1.4 football pitches — or one football pitch is 0.714 hectares. This means a standard football pitch is about 1.76 acres (0.714 × 2.471). Football pitches are annoyingly non-round in both acres and hectares.

## See Also

- [Hectares to Acres](https://www.unitconvertercalculator.com/area/hectares-to-acres/)