Acres to square meters (acre to m²) converter

What is an acres to square meters converter?

An acres to square meters converter is an online tool that translates an area expressed in acres into its equivalent in square meters, and back again. The acre belongs to the imperial and US customary systems and is still widely used for land, farming and real estate, while the square meter is the standard unit of area in the metric (SI) system. Because the two units come from different measurement traditions, moving between them by hand is error-prone — this converter does the arithmetic instantly and in both directions.

How does the converter work?

You enter a value on either side of the converter. Type a figure in acres and the tool returns the matching number of square meters; type a figure in square meters and it returns acres. Whichever field you edit last becomes the source, and the opposite field is recalculated automatically. Each side also lets you switch the unit (for example to square centimeters or square miles), so the same tool covers several related area conversions without any manual rounding on your part.

Formula for conversion

The relationship between the two units is fixed and exact. One acre is defined as 4046.8564224 square meters.

To convert acres to square meters:

$\text{m}^2 = \text{acres} \times 4046.8564224$

To convert square meters to acres:

$\text{acres} = \text{m}^2 \times 0.0002471053814672$

The second factor is simply the reciprocal of the first, so the two formulas are perfectly consistent with one another.

Conversion table

The table below lists common acre values and their exact equivalent in square meters.

Examples

Example 1: One acre to square meters

A single acre of land is converted directly with the base factor:

$1 \text{ acre} \times 4046.8564224 = 4046.8564224 \text{ m}^2$

So one acre is just over 4046.86 square meters.

Example 2: Five acres to square meters

For a five-acre plot, multiply by the same factor:

$5 \text{ acres} \times 4046.8564224 = 20234.282112 \text{ m}^2$

The five-acre parcel covers roughly 20,234.28 square meters.

Example 3: Square meters back to acres

Suppose a property is recorded as 4046.8564224 square meters. Converting back the other way confirms the relationship:

$4046.8564224 \text{ m}^2 \times 0.0002471053814672 = 1 \text{ acre}$

Example 4: One square mile to acres

The converter also handles other area units on each side. Because 1 square mile equals exactly 640 acres, entering 1 square mile returns:

$1 \text{ mi}^2 = 640 \text{ acres}$

This reflects the historical definition in which a square mile is divided into 640 one-acre sections.

Notes

• The factor 1 acre = 4046.8564224 m² is exact, derived from the international yard and foot definitions, so results are limited only by how many decimals you choose to keep.
• A square mile contains exactly 640 acres, and a hectare (10,000 m²) is about 2.47 acres — useful mental checks when reviewing converted figures.
• Always confirm whether a source quotes the international acre; the US survey acre differs by only a few parts per million and rarely matters outside surveying.

Frequently asked questions

How many square meters are in one acre?

One acre is exactly 4046.8564224 square meters, which rounds to about 4046.86 m².

How do I convert square meters to acres?

Multiply the number of square meters by 0.0002471053814672, or equivalently divide by 4046.8564224. For example, 4046.8564224 m² converts back to exactly 1 acre.

How many acres are in a square mile?

There are exactly 640 acres in one square mile, since a square mile was historically divided into 640 one-acre sections.

How big is 5 acres in square meters?

Five acres equals 20,234.282112 square meters, found by multiplying 5 by 4046.8564224.

Is the acre an exact or approximate unit?

The international acre is defined exactly as 4046.8564224 square meters, so conversions to and from square meters are exact rather than approximate.

Can I convert other area units with this tool?

Yes. Each side of the converter lets you choose units such as square centimeters, square feet and square miles, so you can move between several area units without re-entering the value.