Acres to Square Meters Converter

About the ac to m² calculation

One acre is exactly 4,046.86 square meters, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The standard land unit in the US and UK — originally the area one ox team could plough in a day. The standard unit for floor area in metric countries.

Formula

m² = ac × 4,046.86

1 ac = 4,046.86 m²
1 m² = 0.00024711 ac

Worked example

To convert 1 ac, multiply by 4,046.86: 1 × 4,046.86 = 4,046.86 m².

Frequently asked questions

How many square meters are in a acre?

There are 4,046.86 square meters in one acre. To convert any amount, multiply the number of acres by 4,046.86.

How do I convert square meters back to acres?

Divide instead of multiplying, or equivalently multiply by 0.00024711. One square meter is 0.00024711 acres.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between acres and square meters is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Where is each of these units used?

Acres: the standard land unit in the US and UK — originally the area one ox team could plough in a day. Square Meters: the standard unit for floor area in metric countries.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units