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Area • NIST Exact

Hectares → Acres

ha → ac

1 ha = 2.47105381 ac• NIST Exact

ha → ac Reference Table

ha ac
0.01 ha 0.02471053815 ac
0.1 ha 0.2471053815 ac
0.5 ha 1.235526907 ac
1 ha 2.471053815 ac
2 ha 4.942107629 ac
5 ha 12.35526907 ac
10 ha 24.71053815 ac
20 ha 49.42107629 ac
50 ha 123.5526907 ac
100 ha 247.1053815 ac
500 ha 1235.526907 ac
1000 ha 2471.053815 ac

Values based on NIST SP 811 conversion factors

🌍 Real-World Examples

FIFA soccer field (≈0.7 ha → pitch area)

0.4 ha = 0.9884215259 ac

Small family farm plot

1 ha = 2.471053815 ac

Medium-sized farm (1 km²)

100 ha = 247.1053815 ac

Vineyard / small estate

10 ha = 24.71053815 ac

Why Convert Hectares to Acres?

Converting between hectares (ha) and acres (ac) is one of the most common area conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert ha to ac saves time and prevents errors.

Area conversions between ha and ac are critical in real estate, agriculture, and urban planning. When buying property internationally, apartment sizes are quoted in square meters in most countries but square feet in the US. Agricultural land in China uses mu (亩), while Western countries use hectares or acres. Understanding area conversion helps compare real estate prices across different markets accurately.

How to Convert Hectares to Acres

To convert hectares to acres, use the following formula:

ac = ha × 2.471053815

Example: 1 ha = 2.471053815 ac

For example, 5 ha = 12.35526907 ac, 10 ha = 24.71053815 ac, and 100 ha = 247.1053815 ac. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Use Cases

  • FIFA soccer field (≈0.7 ha → pitch area): 0.4 ha = 0.9884215259 ac
  • Small family farm plot: 1 ha = 2.471053815 ac
  • Medium-sized farm (1 km²): 100 ha = 247.1053815 ac
  • Vineyard / small estate: 10 ha = 24.71053815 ac

Common Mistakes to Avoid

  • Square vs linear: When converting area, the factor is squared. If 1 m = 3.281 ft, then 1 m² = 10.764 ft² (3.281²), not 3.281 ft².
  • Hectare vs acre precision: 1 hectare = 2.471 acres. Many people round to 2.5, which introduces 1.2% error — significant for land transactions.
  • Regional units: Asian countries use unique area units (畝/mu in China, 坪/pyeong in Korea/Taiwan). Don't assume universal standards.

Pro Tips

  • Memorize the factor: 1 ha = 2.471053815 ac. For quick mental math, remember this base conversion.
  • Quick reference: 5 ha = 12.35526907 ac · 10 ha = 24.71053815 ac · 25 ha = 61.77634537 ac · 50 ha = 123.5526907 ac · 100 ha = 247.1053815 ac
  • Bookmark this page: Save this converter for instant access. It works offline once loaded — no internet needed.

Hectares to Acres Conversion Table

haac
0.01 ha0.02471053815 ac
0.1 ha0.2471053815 ac
0.5 ha1.235526907 ac
1 ha2.471053815 ac
2 ha4.942107629 ac
5 ha12.35526907 ac
10 ha24.71053815 ac
20 ha49.42107629 ac
50 ha123.5526907 ac
100 ha247.1053815 ac
500 ha1235.526907 ac
1000 ha2471.053815 ac

All values in this table are mathematically exact per NIST SP 811.

Frequently Asked Questions

How many acres are in 1 hectare?

1 ha equals 2.471053815 ac. This is an exact conversion factor defined by NIST.

How do I convert hectares to acres?

Multiply the value in ha by the conversion factor. For example, 10 ha = 24.71053815 ac. Use our calculator above for instant results.

Is the hectares to acres conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Area More Conversions

m² → ft² ft² → m² ac → ha km² → mi² mi² → km² m² → 亩 亩 → m²