This online calculator converts square meters (m²) to acres (ac) using the exact legal factor for the international acre. Square meter is the SI unit of area (BIPM SI Brochure). The acre is defined in UK law as an exact number of square meters.
Square Meters (m²) to Acres (ac) Converter
Enter a value in square meters (m²) below and press the button to convert it to acres (ac).
Square Meters (m²)
Result in Acres (ac)
How to Use
- Input field accepts areas in square meters (m²).
- Decimal Places controls rounding (0–10).
- Press Convert to display acres and the calculation step.
- Copy Result places the output on the clipboard.
- Clear All resets fields and the calculation trace.
- Swap — opens the companion acres to square meters calculator.
Definitions of Measurement Units
Square meter (m²) — SI derived unit of area, equal to the area of a square with 1 m sides. System: SI. Abbreviation: m². Cross-system reference: 1 m² = 10.7639104167 ft² (exact via 1 ft = 0.3048 m). Useful identity in this calculator: 1 m² ≈ 0.0002471053815 ac.
Acre (ac) — Land area unit in the Imperial/US customary systems. International acre is defined exactly as 4,046.8564224 m² (also 43,560 ft²). System: Imperial/US customary. Abbreviation: ac. Cross-system identity: 1 ac = 4,046.8564224 m² (exact).
Conversion formula
From square meters to acres: ac = m² ÷ 4,046.8564224.
From acres to square meters: m² = ac × 4,046.8564224.
Exact factor source: UK Units of Measurement Regulations 1995
Conversion table
| Square Meters (m²) | Acres (ac) |
|---|---|
| 0.100 | 0.000025 |
| 0.500 | 0.000124 |
| 1.000 | 0.000247 |
| 2.000 | 0.000494 |
| 5.000 | 0.001236 |
| 10.000 | 0.002471 |
| 20.000 | 0.004942 |
| 50.000 | 0.012355 |
| 75.000 | 0.018533 |
| 100.000 | 0.024711 |
| 250.000 | 0.061776 |
| 500.000 | 0.123553 |
| 750.000 | 0.185329 |
| 1,000.000 | 0.247105 |
| 2,000.000 | 0.494211 |
| 5,000.000 | 1.235527 |
| 10,000.000 | 2.471054 |
| 20,000.000 | 4.942108 |
| 50,000.000 | 12.355269 |
| 100,000.000 | 24.710538 |
Real-World Examples
- NBA basketball court (94 ft × 50 ft): 436.644288 m² = 0.107897 ac.
- Tennis court, doubles (23.77 m × 10.97 m): 260.7569 m² = 0.064434 ac.
- Tennis court, singles (23.77 m × 8.23 m): 195.6271 m² = 0.048341 ac.
- Olympic swimming pool (50 m × 25 m): 1,250.0000 m² = 0.308882 ac.
- Volleyball court (18 m × 9 m): 162.0000 m² = 0.040031 ac.
- Badminton court, doubles (13.40 m × 6.10 m): 81.7400 m² = 0.020198 ac.
- NHL ice rink (200 ft × 85 ft): 1,579.35168 m² = 0.390266 ac.
- American football field including end zones (360 ft × 160 ft): 5,351.215104 m² = 1.322314 ac.
- Team handball court (40 m × 20 m): 800.0000 m² = 0.197684 ac.
- One hectare: 10,000.0000 m² = 2.471054 ac.
What tasks bring this calculator into play? Requests for additional area tools or specific unit pairs are welcome in the comments; frequently requested ideas are prioritized.
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