Hectare to Acre Converter
Area · unit-converter
Convert Hectare to Acre with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use square-meter-based definitions (international feet / yard standards, acre, hectare, and regional units like pyeong/tsubo).
Calculator
From: Hectare (ha)
To: Acre (ac)
About Hectare
The hectare is 10,000 square meters (100 m × 100 m). It is widely used for farmland, forests, and land registration outside the US.
About Acre
The international acre is 4,046.8564224 m² by definition. Acres are standard for rural and suburban land in the US and still appear in UK property contexts.
How to convert hectares to acres
1 hectare is equal to 2.47105381467165 acre:
1 ha = (10000 m² ÷ 4046.8564224 m²) ac = 2.47105381467165 ac
Each hectare is defined as 10000 m² and each acre as 4046.8564224 m², so one ha equals 10000 ÷ 4046.8564224 ac = 2.47105381467165 ac.
Let a(ha) be the numeric value of the same area measured in Hectare (ha), and a(ac) the value in Acre (ac). Then:
a(ac) = a(ha) × (10000 / 4046.8564224)
Equivalently, divide by how many ha fit into one ac (m² per ac divided by m² per ha):
a(ac) = a(ha) ÷ 0.40468564224
Or: acre = hectare ÷ 0.40468564224
Examples
Example #1: Convert 20 ha to acre
20 ha = 20 ha × (10000/4046.8564224) ac = 49.4210762934 ac
20 ha = 20 ha ÷ 0.40468564224 = 49.4210762934 ac
Example #2: Convert 50 ha to acre
50 ha = 50 ha × (10000/4046.8564224) ac = 123.552690734 ac
50 ha = 50 ha ÷ 0.40468564224 = 123.552690734 ac
Summary
To convert Hectare to Acre, multiply the value in ha by the ratio of square meters per ha divided by square meters per ac. Equivalently: value_ac = value_ha × (10000 / 4046.8564224). Numerically, 1 ha equals 2.471053814671653 ac.
Relationship context
You are converting between metric (SI) (Hectares) and US customary / imperial (Acres). Metric area is decimal from the square meter; US/imperial units use feet, yards, miles, and acres tied to international feet (0.3048 m) and related definitions. The numeric factor used here is 2.471054e+0.
Conversion tables
| Hectare (ha) | Acre (ac) |
|---|---|
| 0.1 | 0.2471053815 |
| 1 | 2.4710538147 |
| 2 | 4.9421076293 |
| 3 | 7.413161444 |
| 4 | 9.8842152587 |
| 5 | 12.3552690734 |
| 6 | 14.826322888 |
| 7 | 17.2973767027 |
| 8 | 19.7684305174 |
| 9 | 22.239484332 |
| Hectare (ha) | Acre (ac) |
|---|---|
| 10 | 24.7105381467 |
| 20 | 49.4210762934 |
| 30 | 74.1316144401 |
| 40 | 98.8421525869 |
| 50 | 123.552690734 |
| 60 | 148.26322888 |
| 70 | 172.973767027 |
| 80 | 197.684305174 |
| 90 | 222.39484332 |
| 100 | 247.105381467 |