Acres to Square Meters
Convert acres to square meters instantly — one acre is 4046.86 square meters.
| Acres | Square Meters |
|---|---|
| 1 ac | 4046.856422 m² |
| 2 ac | 8093.712845 m² |
| 3 ac | 12140.569267 m² |
| 5 ac | 20234.282112 m² |
| 10 ac | 40468.564224 m² |
| 25 ac | 101171.41056 m² |
| 50 ac | 202342.82112 m² |
| 100 ac | 404685.64224 m² |
How to use
- Enter a value in the Acres field.
- The Square Meters figure appears immediately — no button to press.
- Typing in the Square Meters field converts back to Acres the same way.
- Use the reference table for the values that come up most often.
Acres to Square Meters formula
To convert acres to square meters, multiply by 4046.85642.
m² = ac × 4046.85642
Why this factor: the acre and the square meter are both defined against the square meter, so dividing one definition by the other gives 4046.85642 directly. Both definitions are set out in full below.
To go the other way, divide by 4046.85642 — or use the Square Meters to Acres converter, which is the same calculation reversed.
Worked example
Given 250 ac, multiplying by 4046.85642 yields 1011714.1056 m².
250 ac × 4046.85642 = 1011714.1056 m²
The converter above does this for any value you type, in either direction.
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.
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.
Acres vs Square Meters
The acre is an imperial unit while the square meter is an SI 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 square meters are in an acre?
One acre equals 4046.85642 square meters.
What is the formula to convert acres to square meters?
Multiply the number of acres by 4046.85642. To reverse it, divide by 4046.85642 instead.
How do I convert square meters back to acres?
Divide by 4046.85642, which is the same as multiplying by 0.000247105381.
How many square meters are in 10 acres?
10 ac works out to 40468.564224 m².
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 acre defined?
One chain by one furlong — 43,560 square feet — which is exactly 4,046.8564224 square meters.