Convert Acres to Square meters
40 acres is 161,874.26 m². One acre is exactly 4046.8564224 square meters.
40 acres is 161874.26 square meters, because one acre is 4046.8564 square meters. To convert acres to square meters, multiply by 4046.8564; to go the other way, divide by 4046.8564 or multiply by 2.4711 × 10^-4. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Office of Weights and Measures. Exactly 43,560 square feet — historically the land one team of oxen could plough in a day.
Factor checked against the defining standard · How we check
- Acres × 4046.8564
40 * 4046.8564161,874.257 m²
40 acres in every area unit
| Unit | Value | Exact factor |
|---|---|---|
| square inches | 250,905,600 sq in | × 6,272,640 |
| square feet | 1,742,400 sq ft | × 43,560 |
| square yards | 193,600 sq yd | × 4,840 |
| acres (as entered) | 40 ac | — |
| square meters | 161,874.2569 m² | × 4,046.8564224 |
| square millimetres | 161,874,256,900 mm² | × 4,046,856,422.4 |
| square centimetres | 1,618,742,569 cm² | × 40,468,564.224 |
| square kilometres | 0.1618742569 km² | × 0.0040468564224 |
| square miles | 0.0625 mi² | × 0.0015625 |
| hectares | 16.18742569 ha | × 0.40468564224 |
Factors are entered by hand from NIST Office of Weights and Measures rather than derived from a units library, so the ones that terminate are exact rather than rounded.
The same converter answers this pair however it is written: acres to square metres is the British spelling of the same units — the metre and the litre are spelled that way outside the United States and the quantity does not change, and ac to sqm is how the symbols are typed on a keyboard with no superscript on it.
How do you convert acres to square meters? The converter and the working
- 1.Take the measurement in acres.
- 2.Multiply by 4046.8564 — that is how many square meters fit in one acre.
- 3.To go back the other way, divide by 4046.8564, or multiply by 2.4711 × 10^-4.
Worked example: 25 acres to square meters
- Formula
- ac × 4046.8564 = m²
- Arithmetic
- 25 × 4046.8564 = 101,171.41 m²
- Answer
- 25 ac = 101,171.41 m²
The factor is rounded for display; the figure above is computed from the full value.
Acres to square meters conversion table
| Acres | Square meters |
|---|---|
| 1 ac | 4,046.86 m² |
| 2 ac | 8,093.71 m² |
| 3 ac | 12,140.57 m² |
| 4 ac | 16,187.43 m² |
| 5 ac | 20,234.28 m² |
| 6 ac | 24,281.14 m² |
| 7 ac | 28,327.99 m² |
| 8 ac | 32,374.85 m² |
| 9 ac | 36,421.71 m² |
| 10 ac | 40,468.56 m² |
| 12 ac | 48,562.28 m² |
| 15 ac | 60,702.85 m² |
| 20 ac | 80,937.13 m² |
| 25 ac | 101,171.41 m² |
| 50 ac | 202,342.82 m² |
| 100 ac | 404,685.64 m² |
| 200 ac | 809,371.28 m² |
| 300 ac | 1,214,056.93 m² |
| 500 ac | 2,023,428.21 m² |
| 1000 ac | 4,046,856.42 m² |
| 2000 ac | 8,093,712.84 m² |
| 5000 ac | 20,234,282.11 m² |
| 10000 ac | 40,468,564.22 m² |
Two acres, and a land deed may mean either
The international acre is exactly 4,046.8564224 m². The US survey acre, built on the survey foot, is 4,046.8726 m² — larger by four parts per million, which is nothing on a garden and about 16 m² across a thousand acres. NIST retired the survey foot on 31 December 2022, but deeds, plats and state plane coordinates written before then still use it, so a boundary described in survey acres does not close against a modern one.
What is an acre?
Exactly 43,560 square feet — historically the land one team of oxen could plough in a day.
What is a square meter?
A meter on a side, and about 10.764 square feet.
How many square meters are in an acre?
One acre is 4046.8564 square meters. Going the other way, one square meter is 2.4711 × 10^-4 acres. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every area unit here
The whole group — 10 units with their symbols and the size of each one in square meters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to an acre.
Cite this page
- APA
- Rule Calculator. (2026). Convert Acres to square meters. Rule Calculator. https://rulecalculators.com/convert/acre-to-square-meter
- MLA
- "Convert Acres to square meters." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/acre-to-square-meter.
- Chicago
- Rule Calculator. "Convert Acres to square meters." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/acre-to-square-meter.
The date is when the figures on this page were last checked against their source, not the day you opened it. Add your own access date if your style needs one.
Questions people actually ask
- How many square meters are in an acre?
- 4046.8564. A meter on a side, and about 10.764 square feet.
- How do I convert square meters back to acres?
- Divide by 4046.8564, or multiply by 2.4711 × 10^-4 — they are the same operation.
The values people look up
Each one is this page with the value filled in, and each answers in its own title.
Other area conversions
Square meters to acres — the same conversion the other way.