M² to acres
One m² equals 0.0002471053815 ac. Type any number and the answer appears as you type — the maths happens in your browser.
The same value in every unit
| Unit | Value |
|---|
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Common values
| m² | acres |
|---|---|
| 1 m² | 0.00024710538 ac |
| 2 m² | 0.00049421076 ac |
| 3 m² | 0.00074131614 ac |
| 5 m² | 0.0012355269 ac |
| 10 m² | 0.0024710538 ac |
| 15 m² | 0.0037065807 ac |
| 20 m² | 0.0049421076 ac |
| 25 m² | 0.0061776345 ac |
| 50 m² | 0.012355269 ac |
| 100 m² | 0.024710538 ac |
| 500 m² | 0.12355269 ac |
| 1000 m² | 0.24710538 ac |
How to use
- Enter the number of m² in the field.
- The result in acres updates on every keystroke.
- Use the table below for the values people look up most often.
Formula and reverse conversion
The formula
To convert by hand: ac = m² ÷ 4046.856422. Going back the other way, one ac is 4046.856422 m².
Where the odd number comes from
The factor is not a round number because the imperial units are defined through the metric ones by international agreement: an inch is exactly 25.4 mm and a pound is exactly 0.45359237 kg. Everything else follows from those definitions.
ac = m² ÷ 4046.856422
Frequently asked questions
How many acres are in one m²?
One m² is 0.0002471053815 ac.
How do I convert m² to acres?
Multiply by the factor: ac = m² ÷ 4046.856422.
Is the result exact?
The factors are the exact legal definitions, and up to ten significant digits are kept in the answer. Rounding happens only in the display.
How do I convert acres back to m²?
One ac is 4046.856422 m² — or open the reverse page linked below.