How the acre-to-square-metre converter works

A land parcel beside a square-metre grid

Enter an area in acres or square metres. The matching field changes immediately, and the middle button reverses the conversion.

The international acre has an exact metric size

One international acre contains exactly 43,560 square feet. The international foot is exactly 0.3048 metres, so the acre is exactly 4,046.8564224 m².

A_{\mathrm{m^2}}=4046.8564224\,A_{\mathrm{ac}},\qquad A_{\mathrm{ac}}=\frac{A_{\mathrm{m^2}}}{4046.8564224}

The calculator uses this full factor rather than the commonly rounded 4,047 m².

Useful area comparisons

0.5 acre = 2,023.4282112 m². This is half the exact acre area.
2 acres = 8,093.7128448 m².
10 acres = 40,468.564224 m².
10,000 m² ≈ 2.471053814672 acres. That metric area is one hectare.

Area does not determine a plot’s shape

An acre measures surface area, not length. A square acre would have sides of about 63.615 metres, but a one-acre parcel may be long, narrow or irregular and still have the same area.

The tool uses the international acre. Historical acre variants found in older records may have different sizes, so check the definition when working with archival documents.

Questions about acres and square metres

These quick answers cover the factor, rounding and nearby land units.

How many square metres are in one acre?

One international acre contains exactly 4,046.8564224 square metres.

How do I convert square metres to acres?

Divide the square-metre value by 4,046.8564224.

Is an acre the same as a hectare?

No. One acre equals 0.40468564224 hectare, while one hectare is about 2.471053814672 acres.

Is 4,047 m² exactly one acre?

No. It is a convenient rounded value; the exact international acre is 4,046.8564224 m².

Does the conversion depend on the shape of the land?

No. The same factor applies to any shape because both units measure area.

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Calcopedia (en) → Acres to square metres converter