Hectares to Acres Converter (ha to ac)
Convert hectares to acres for farmland, land listings and forestry. 1 ha = 2.47105 acres, so 10 hectares is 24.71 acres and 100 hectares is 247.1 acres.
Real-World Benchmarks
Multi-Unit Conversion Matrix
| Group | Measurement | Symbol | Equivalent Value |
|---|---|---|---|
| Metric (SI) | Square Millimeter | mm² | 1.0000E11 |
| Metric (SI) | Square Centimeter | cm² | 1.0000E9 |
| Metric (SI) | Square Meter | m² | 100,000 |
| Metric (SI) | Are | a | 1,000 |
| Metric (SI) | Hectare | ha | 10 |
| Metric (SI) | Square Kilometer | km² | 0.1 |
| Imperial & US Customary | Square Inch | in² | 1.5500E8 |
| Imperial & US Customary | Square Foot | ft² | 1,076,391.0417 |
| Imperial & US Customary | Square Yard | yd² | 119,599.0046 |
| Imperial & US Customary | Acre | ac | 24.7105 |
| Imperial & US Customary | Square Mile | mi² | 0.0386 |
Step-by-Step Mathematical Explanation
- Step 1: Convert 10 ha to the base unit (m²): 10 × 10,000 = 100,000 m².
- Step 2: Convert base square meters to acres: 100,000 ÷ 4,046.8564224 = 24.710538 ac.
- Direct factor: 1 ha = 2.47105381 ac.
Essential Conversion Factors
Hectare: Farmland, forests and land registries (10,000 m²)
ha to ac formula
Direct Answer: 1 ha = 2.4710538 ac, so multiply by 2.4710538: ac = ha × 2.4710538. Going back: ha = ac × 0.40468564.
How to convert hectares to acres
A hectare is 10,000 m² (a square 100 m × 100 m). An international acre is 43,560 ft², exactly 4,046.8564224 m². Dividing 10,000 by 4,046.8564 gives 2.4710538 acres per hectare. The US survey acre differs by only 4 parts per million, so the result is the same at practical precision.
1. ha → ac
Multiply the number of hectares by the conversion factor:
Example: 10 ha × 2.4710538 = 24.71 ac.
2. ac → ha
To go back, divide by the same factor, or multiply by its reciprocal, 0.40468564:
Example: 24.71 ac ÷ 2.4710538 = 10 ha.
Mental math: multiply by 2.5
Multiply by 2.5, then take off about 1%:
40 ha: 40 × 2.5 = 100, minus 1 = 99 acres (exact: 98.84 acres).
1 ha in other area units
| Unit | 1 ha equals | Typical use |
|---|---|---|
| Square Millimeter | 10,000,000,000 mm² | Wire cross-sections and electronics |
| Square Centimeter | 100,000,000 cm² | Paper, tiles and small surfaces |
| Square Meter | 10,000 m² | SI unit of area — rooms, apartments and flooring |
| Are | 100 a | Garden plots and small parcels (100 m²) |
| Square Kilometer | 0.01 km² | Cities, lakes and national territories |
| Square Inch | 15,500,031 in² | Screens, gaskets and small parts |
| Square Foot | 107,639.1 ft² | US & UK real estate and floor plans |
| Square Yard | 11,959.9 yd² | Carpet, turf and landscaping (9 ft²) |
| Acre | 2.4710538 ac | US & UK land parcels (43,560 ft²) |
| Square Mile | 0.0038610216 mi² | Counties, states and large regions (640 acres) |
ha to ac chart
| ha | ac |
|---|---|
| 0.1 | 0.25 |
| 0.2 | 0.49 |
| 0.25 | 0.62 |
| 0.4 | 0.99 |
| 0.5 | 1.24 |
| 0.75 | 1.85 |
| 1 | 2.47 |
| 1.5 | 3.71 |
| 2 | 4.94 |
| 2.5 | 6.18 |
| 3 | 7.41 |
| 4 | 9.88 |
| 5 | 12.36 |
| 6 | 14.83 |
| 8 | 19.77 |
| 10 | 24.71 |
| 12 | 29.65 |
| 15 | 37.07 |
| 20 | 49.42 |
| 25 | 61.78 |
| 30 | 74.13 |
| 40 | 98.84 |
| 50 | 123.55 |
| 75 | 185.33 |
| 100 | 247.11 |
| 200 | 494.21 |
| 500 | 1,235.53 |
| 1,000 | 2,471.05 |
ac to ha chart
| ac | ha |
|---|---|
| 0.25 | 0.101 |
| 0.5 | 0.202 |
| 0.75 | 0.304 |
| 1 | 0.405 |
| 1.5 | 0.607 |
| 2 | 0.809 |
| 2.5 | 1.012 |
| 3 | 1.214 |
| 4 | 1.619 |
| 5 | 2.023 |
| 6 | 2.428 |
| 8 | 3.237 |
| 10 | 4.047 |
| 15 | 6.07 |
| 20 | 8.094 |
| 25 | 10.117 |
| 30 | 12.141 |
| 40 | 16.187 |
| 50 | 20.234 |
| 75 | 30.351 |
| 80 | 32.375 |
| 100 | 40.469 |
| 160 | 64.75 |
| 200 | 80.937 |
| 320 | 129.499 |
| 500 | 202.343 |
| 640 | 258.999 |
| 1,000 | 404.686 |
Frequently Asked Questions
What is 1 ha in ac?
1 ha is 2.47 ac (1 × 2.4710538).
What is 50 ha in ac?
50 ha is 123.55 ac (50 × 2.4710538).
How big is a hectare compared to a football pitch?
A hectare (10,000 m²) is about 1.4 FIFA-size football pitches (105 × 68 m = 7,140 m²), or a little under 2 American football fields including end zones.
Which countries use hectares and which use acres?
Hectares are standard in the EU, Australia, Canada (officially), Brazil and most of the world. Acres remain in everyday use in the US, UK, Ireland and parts of Canada.