Acres to Hectares Converter
Convert acres (ac) to hectares (ha). One acre equals 0.404686 hectares, so multiply a value in acres by 0.404686 to get hectares.
Formula: multiply the source value by 0.40468564
Quick Conversions
About this tool
The international acre is 43,560 square feet, exactly 4,046.8564224 square meters. A hectare is 10,000 square meters, the area of a square 100 meters on each side. Because 1 acre is 4,046.8564224 square meters and 1 hectare is 10,000 square meters, the factor is their ratio, 0.40468564224.
How to use it
- Type a value in acres in the first field. The unit menus start on ac → ha.
- Read the result in hectares. It updates as you type; use Precision to choose how many decimals are shown.
- Press the swap button, or open the Hectares to Acres converter, to convert hectares back to acres.
ha = ac × 0.40468564224
ac = ha ÷ 0.40468564224
Examples
1 ac to ha
1 ac × 0.404686 = 0.404686 ha.
10 ac to ha
10 ac × 0.404686 = 4.04686 ha.
640 ac to ha (one square mile)
640 ac × 0.404686 = 258.999 ha.
Acres to hectares conversion table
| Acres (ac) | Hectares (ha) |
|---|---|
| 0.25 | 0.101171 |
| 0.5 | 0.202343 |
| 1 | 0.404686 |
| 2 | 0.809371 |
| 5 | 2.02343 |
| 10 | 4.04686 |
| 20 | 8.09371 |
| 50 | 20.2343 |
| 100 | 40.4686 |
| 500 | 202.343 |
| 1,000 | 404.686 |
Hectares to acres (reverse)
| Hectares (ha) | Acres (ac) |
|---|---|
| 1 | 2.47105 |
| 5 | 12.3553 |
| 10 | 24.7105 |
| 50 | 123.553 |
| 100 | 247.105 |
FAQ
How many hectares are in one acre?
One acre is 0.404686 hectares. The unrounded factor is 0.40468564224.
How do I convert hectares back to acres?
Divide by 0.404686, or multiply by 2.47105. For example, 10 ha is 24.7105 ac.
How big is an acre?
43,560 square feet, about 4,046.86 m². That is roughly 40% of a hectare, or about 0.4 of a 100 m × 100 m square.
Is the conversion exact?
Yes, before rounding. The square foot, square yard, and acre are all defined exactly in square meters through the international foot (0.3048 m).