Acre to Hectare Converter
Convert imperial acres to metric hectares with high precision. Standard for international farmland transactions, forestry, and global real estate appraisals.
How to Convert Acres to Hectares
An acre and a hectare are both standardized units of area measurement used predominantly for large tracts of land. The acre is part of the imperial and US customary systems, while the hectare is the metric international standard (equivalent to 10,000 square meters).
Hectares = Acres × 0.40468564224
For quick mental calculation, multiply the acreage by 0.405 (or divide by 2.47).
Worked Examples:
- Example 1: Convert 5 Acres to Hectares:
5 × 0.404686 = 2.02343 ha. - Example 2: Convert 10 Acres to Hectares:
10 × 0.404686 = 4.04686 ha. - Example 3: Convert 100 Acres to Hectares:
100 × 0.404686 = 40.4686 ha. - Example 4: Convert 640 Acres (1 Square Mile / Section) to Hectares:
640 × 0.404686 = 258.9988 ha.
Acre to Hectare Conversion Reference Table
| Acres (ac) | Hectares (ha) | Square Meters (m²) | Square Feet (sq ft) |
|---|---|---|---|
| 0.5 ac | 0.20234 ha | 2,023.43 m² | 21,780 sq ft |
| 1.0 ac | 0.40469 ha | 4,046.86 m² | 43,560 sq ft |
| 2.5 ac | 1.01171 ha | 10,117.14 m² | 108,900 sq ft |
| 5.0 ac | 2.02343 ha | 20,234.28 m² | 217,800 sq ft |
| 10.0 ac | 4.04686 ha | 40,468.56 m² | 435,600 sq ft |
| 20.0 ac | 8.09371 ha | 80,937.13 m² | 871,200 sq ft |
| 50.0 ac | 20.23428 ha | 202,342.82 m² | 2,178,000 sq ft |
| 100.0 ac | 40.46856 ha | 404,685.64 m² | 4,356,000 sq ft |
| 160.0 ac (Quarter Section) | 64.74970 ha | 647,497.03 m² | 6,969,600 sq ft |
| 640.0 ac (1 Sq Mile) | 258.99881 ha | 2,589,988.11 m² | 27,878,400 sq ft |
Acre to Hectare: Practical Conversion Guide
Acres and hectares are both common land-area units, but they are used in different regions and contexts. The relationship is fixed: 1 acre = 0.4046856424 hectare. To convert acres to hectares, multiply the number of acres by 0.4046856424.
Hectares = Acres × 0.4046856424
For example, 5 acres × 0.4046856424 = 2.023428212 hectares.
Common Conversions
- 0.25 acre = 0.1011714106 hectare
- 0.5 acre = 0.2023428212 hectare
- 1 acre = 0.4046856424 hectare
- 2 acres = 0.8093712848 hectare
- 5 acres = 2.023428212 hectares
- 10 acres = 4.046856424 hectares
- 100 acres = 40.46856424 hectares
When should you use hectares?
Hectares are especially common in agricultural, cadastral and large-land contexts in countries that use the metric system. For small residential plots, square metres or square feet may be more convenient. The underlying area is the same; only the unit changes.
Reverse conversion
To convert hectares back to acres, divide by 0.4046856424, or multiply by approximately 2.4710538147. Use the calculator above when you need more decimal precision.