Acres to square metres

Multiply acres by 4,046.8564 to get square metres.

1 ac = 4,046.8564 m²NIST HB 44 · BIPM SI

Convert

8,093.7128m²

2 ac = 8,093.7128 m²

How to convert acres to square metres

The square metre is the SI unit of area, a square one metre on each side. The acre is exactly 43 560 square feet (4046.8564224 m²).

Worked example — 2 ac: 2 × 4,046.8564 = 8,093.7128 m².

Acres to square metres table

Common conversions. The reverse table is on square metres to acres.
Acres	Square metres
0.1 ac	404.6856 m²
0.25 ac	1,011.7141 m²
0.5 ac	2,023.4282 m²
1 ac	4,046.8564 m²
2 ac	8,093.7128 m²
5 ac	20,234.2821 m²
10 ac	40,468.5642 m²
20 ac	80,937.1284 m²
100 ac	404,685.6422 m²

Reverse and related

square metres → acresreverse conversion ft² → m²1 ft² = 0.092903 m² m² → ft²1 m² = 10.7639 ft² ac → ft²1 ac = 43,560 ft² ha → ac1 ha = 2.4711 ac ac → ha1 ac = 0.404686 ha m² → yd²1 m² = 1.196 yd²

About acres and square metres

Acre (ac)

1 ac = 4,046.8564 m²

Definition. Exactly 43 560 square feet (4046.8564224 m²)

History and origin

The acre began as the area a yoke of oxen could plough in a day, later fixed as 43 560 square feet, or one furlong by one chain. It equals about 4047 square metres.

Current use

Acres are the customary measure for land, farm plots and larger properties in the United States and United Kingdom.

Source: NIST Handbook 44, Appendix C (area); 1959 yard-and-pound agreement

Square metre (m²)

1 m² = 0.000247105 ac

Definition. The SI unit of area, a square one metre on each side

History and origin

The square metre is the SI unit of area, simply a square one metre on each side. It came with the metre in the metric system of the 1790s.

Current use

Square metres measure floor area and the size of rooms and apartments across the metric world.

Source: BIPM SI Brochure (2019)

Where people use this

Acres: land and farm plots, US real estate. Square metres: floor area, room and apartment sizes. 1 acre is about 4047 m².

How we know this is right

The factor is fixed by the standards that define the units, not chosen — so it is exact, not a measurement:

1 m² = 0.0002471053815 ac, so 1 ac = 1 ÷ 0.0002471053815 = 4,046.8564 m².

Every value is carried to full double precision; the display is rounded.

Sources: BIPM SI Brochure (2019); NIST Handbook 44, Appendix C (area); 1959 yard-and-pound agreement.

Questions people ask

How many m² in an acre?

One acre is about 4047 m² (4046.86 m²).

How many acres is 1000 m²?

1000 m² is about 0.247 acres.

How many m² is half an acre?

Half an acre is about 2023 m².

All acre conversions

Acres to hectares1 ac = 0.404686 ha Acres to square feet1 ac = 43,560 ft² Hectares to acres1 ha = 2.4711 ac Square feet to acres1 ft² = 0.0000229568 ac Square metres to acres1 m² = 0.000247105 ac Acres to square miles1 ac = 0.0015625 mi² Square miles to acres1 mi² = 640 ac