Acres to Hectares
Acres to hectares converter: multiply by 0.40469 (1 ac = 0.40469 ha). Includes a reference table, sample calculations and the inverse ratio 2.4711.
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The ac to ha formula
This page converts acres (ac) to hectares (ha). In the converter's unit table, one acre equals 0.40468564 hectares, so every result here comes from a single multiplication by 0.40468564.
The ratio works in both directions: multiply by 0.40468564 to go from acres to hectares, or multiply by 2.471053815 to go from hectares back to acres.
Quick lookup: acres in hectares
Each of the 12 rows pairs an amount in acres with its equivalent in hectares. Scale up or down by powers of ten, since the ratio 0.40468564 does not change.
| Acres (ac) | Hectares (ha) |
|---|---|
| 0.5 | 0.20234282 |
| 1 | 0.40468564 |
| 2 | 0.80937128 |
| 5 | 2.023428211 |
| 10 | 4.046856422 |
| 20 | 8.093712845 |
| 25 | 10.11714106 |
| 50 | 20.23428211 |
| 100 | 40.46856422 |
| 250 | 101.1714106 |
| 500 | 202.3428211 |
| 1,000 | 404.6856422 |
Values in the ha column are shown the way the converter shows them, with a limited number of significant digits.
Worked examples for acres to hectares
Suppose a quantity is 420 acres. Scaling it by 0.40468564 gives 169.9679697 hectares.
Next, 15 ac: the converter shows 6.070284634 ha. Because the ratio is fixed, the ha figure is 0.40468564 times the ac figure.
For the last case, begin with 24 hectares. Multiplying by 2.471053815 gives 59.30529155 acres.
The reverse: hectares to acres
To start from hectares instead, open Hectares to Acres. For that direction 1 ha = 2.471053815 ac, and its reference table is built around hectares as the input.
For other combinations, the Area Converter offers every unit in one pair of dropdowns.
Other conversions in this family
These pages cover neighbouring unit pairs from the same converter.
Frequently asked questions
How many ha make up 1 ac?
There are 0.40468564 hectares in one acre. Ten acres come to 4.046856422 hectares, and 100 ac come to 40.46856422 ha.
What is 1 ha in ac?
The widget shows 2.471053815 acres for each hectare. For 10 hectares, the result is 24.71053815 acres.
How do I convert 850 ac to ha?
850 ac converts to 343.9827959 ha, using the ratio 0.40468564 between the two units.
How does the converter round results?
The widget calculates with ordinary floating-point numbers and only rounds what it displays. Results of 1 or more show up to 10 significant digits, results below 1 show up to 8, and results from 1,000 upward show up to 6 decimal places with thousands separators. As an example, 0.123456789 ac displays as 0.04996119 ha and 1,234.5678 ac displays as 499.611863 ha.
Where does the ac to ha result come from?
Behind the scenes, acres and hectares are each tied to the same base unit by a stored factor. The ratio of those factors, 0.40468564, is what turns an ac value into a ha value.
What is the reverse of ac to ha?
Reversing the pair: multiply by 2.471053815, or equivalently divide by 0.40468564. The page titled "Hectares to Acres" covers it, or you can press the swap button in the widget above. Example: 25 ha = 61.77634537 ac.
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