Acres to Square Meters Converter (ac to m²)

Land in the US, the UK, India and several other countries is often bought and sold in acres, while maps, planning documents and engineering drawings in most countries use square meters. The international acre is 43,560 square feet, and since 1959 the foot has been exactly 0.3048 m, so an acre is exactly 4,046.8564224 m², roughly the area of a square 63.6 m on each side.

Square meters make it easier to compare a plot with buildings or with land measured elsewhere. A half-acre plot is about 2,023 m², and a quarter acre, the traditional suburban block in Australia and New Zealand, about 1,012 m². In India smaller units are defined from the acre as well: a cent is a hundredth of an acre, about 40.47 m², and a guntha a fortieth, about 101.17 m².

How to use this tool

1. Type a value in the Acre box to see it in square meters, or type in the Square Meter box to convert the other way.
2. Press ⇄ to swap the two units, or Load example for a typical value.
3. Check the charts below for common values; for other units, open the Area converter.

Formula

Square Meter (m²) = Acre (ac) × 4046.8564224

Acre (ac) = Square Meter (m²) × 0.000247105381467

Both factors come from exact definitions: 1 square meter = 0.000247105381467 acres and 1 acre = 4046.8564224 square meters (shown to 12 significant digits).

Example

Two conversions worked with the same factors the converter uses:

0.5 ac × 4046.8564224 ≈ 2023.43 m²

10000 m² × 0.000247105381467 ≈ 2.47105 ac

Acre to Square Meter chart

Common values from acres to square meters, rounded to four decimal places.

Square Meter to Acre chart

The reverse direction for values people often look up.

Land units and plots defined from the acre

Quick mental estimate

Multiply by 4,000 and add 1%: 2.5 acres → 10,000 + 100 = 10,100 m². The 1% top-up (×4,040) still leaves the answer about 0.17% low; the exact figure is 10,117 m².

Use the converter or the charts when the exact figure matters.

The two units

Acre (ac): The acre used here is 43,560 international square feet, exactly 4,046.8564224 m². Historical US survey acres are slightly larger, so check the foot definition when interpreting old survey records.

Square Meter (m²): The square metre is the SI unit of area, the area of a square 1 metre on each side. Floor space of homes and offices is given in square metres in most countries.