Square Meters to Acres
An instant square meters-to-acres converter, with the formula and a reference table below.
| Square Meters | Acres |
|---|---|
| 1 m² | 0.000247 ac |
| 2 m² | 0.000494 ac |
| 3 m² | 0.000741 ac |
| 5 m² | 0.001236 ac |
| 10 m² | 0.002471 ac |
| 25 m² | 0.006178 ac |
| 50 m² | 0.012355 ac |
| 100 m² | 0.024711 ac |
How to use
- Enter a value in the Square Meters field.
- The Acres figure appears immediately — no button to press.
- Typing in the Acres field converts back to Square Meters the same way.
- Use the reference table for the values that come up most often.
Square Meters to Acres formula
Converting square meters to acres is a single multiplication by 0.000247105381.
ac = m² × 0.000247105381
Why this factor: the square meter and the acre are both defined against the square meter, so dividing one definition by the other gives 0.000247105381 directly. Both definitions are set out in full below.
To go the other way, divide by 0.000247105381 — or use the Acres to Square Meters converter, which is the same calculation reversed.
Worked example
Take 1000 m² and multiply by the factor 0.000247105381: the result is 0.247105 ac.
1000 m² × 0.000247105381 = 0.247105 ac
The converter above does this for any value you type, in either direction.
What is a square meter?
The square meter is the SI unit of area — the surface of a one-meter square.
Definition: Derived directly from the meter.
Where it is used: Floor area in property listings, land plots, and material coverage worldwide outside the US.
What is an acre?
An acre is the customary land area unit of the US and UK, historically a day's ploughing for one team of oxen.
Definition: One chain by one furlong — 43,560 square feet — which is exactly 4,046.8564224 square meters.
Where it is used: US and UK property and farmland, development parcels, and land sales.
Worth knowing: 640 acres make one square mile, the basis of the US Public Land Survey grid.
Square Meters vs Acres
The square meter is an SI unit while the acre is an imperial unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many acres are in a square meter?
One square meter equals 0.000247105381 acres.
What is the formula to convert square meters to acres?
Multiply the number of square meters by 0.000247105381. To reverse it, divide by 0.000247105381 instead.
How do I convert acres back to square meters?
Divide by 0.000247105381, which is the same as multiplying by 4046.85642.
How many acres are in 10 square meters?
10 m² works out to 0.002471 ac.
Is there anything to watch out for with acres?
640 acres make one square mile, the basis of the US Public Land Survey grid.
How is the square meter defined?
Derived directly from the meter.