This online calculator converts acres (ac) to square meters (m²) using the legally exact factor for the international acre. The square meter is the SI unit of area, defined within the SI Brochure; the acre is defined in UK law with an exact value in square meters.

Acres (ac) to Square Meters (m²) Converter

Enter a value in acres (ac) below and press the button to convert it to square meters (m²).

Acres (ac)

Result in Square Meters (m²)

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Calculation process will appear here.
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How to Use

  1. Enter an area in acres (ac) in the input field.
  2. Select preferred Decimal Places (0–10).
  3. Press Convert to display the result in square meters (m²) and the calculation step.
  4. Use Copy Result to place the value on the clipboard.
  5. Use Clear All to reset fields and the calculation trace.
  6. Swap — opens the companion square meters to acres calculator.

Acres to Square Meters (ac to m2) Online Converter

Definitions of Measurement Units

Acre (ac) — A customary/Imperial unit of area used for land measurement. The international acre is defined exactly as 4,046.8564224 m² and equals 43,560 ft² (with the foot defined as exactly 0.3048 m). System: Imperial/US customary. Abbreviation: ac. Cross-system reference: 1 ac = 4,046.8564224 m² (exact).

Square meter (m²) — SI derived unit of area, formed from the SI base unit metre. System: SI. Abbreviation: m². Cross-system reference: 1 m² ≈ 10.7639104167 ft² (from 1 ft = 0.3048 m exactly).

Conversion formula

From acres to square meters: m² = ac × 4,046.8564224. From square meters to acres: ac = m² ÷ 4,046.8564224. The factor is exact per the UK Units of Measurement Regulations 1995 (Schedule: “acre … 4,046.8564224 square metres”).

Source: UK Units of Measurement Regulations 1995, Schedule.

Conversion table

Acres (ac)Square Meters (m²)
0.0014.05
0.00520.23
0.01040.47
0.02080.94
0.050202.34
0.100404.69
0.2501,011.71
0.5002,023.43
0.7503,035.14
1.0004,046.86
1.5006,070.28
2.0008,093.71
3.00012,140.57
5.00020,234.28
7.50030,351.42
10.00040,468.56
20.00080,937.13
50.000202,342.82
100.000404,685.64
200.000809,371.28

Real-World Examples

  • NBA basketball court (94 ft × 50 ft): 436.64 m² = 0.107897 ac.
  • Tennis court, doubles (23.77 m × 10.97 m): 260.76 m² = 0.064434 ac.
  • Tennis court, singles (23.77 m × 8.23 m): 195.63 m² = 0.048341 ac.
  • Olympic swimming pool (50 m × 25 m): 1,250.00 m² = 0.308882 ac.
  • Volleyball court (18 m × 9 m): 162.00 m² = 0.040031 ac.
  • Badminton court, doubles (13.40 m × 6.10 m): 81.74 m² = 0.020198 ac.
  • NHL ice hockey rink (200 ft × 85 ft): 1,579.35 m² = 0.390266 ac.
  • American football field including end zones (360 ft × 160 ft): 5,351.22 m² = 1.322314 ac.
  • Team handball court (40 m × 20 m): 800.00 m² = 0.197684 ac.
  • One square mile: 2,589,988.11 m² = 640.000000 ac.

What is this calculator used for in daily work or projects? Suggestions for other area tools or unit combinations are welcome in the comments; popular requests are prioritized.

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