Acre to Hectare Converter
Area · unit-converter
Convert Acre to Hectare 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: Acre (ac)
To: Hectare (ha)
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.
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.
How to convert acres to hectares
1 acre is equal to 0.40468564224 hectare:
1 ac = (4046.8564224 m² ÷ 10000 m²) ha = 0.40468564224 ha
Each acre is defined as 4046.8564224 m² and each hectare as 10000 m², so one ac equals 4046.8564224 ÷ 10000 ha = 0.40468564224 ha.
Let a(ac) be the numeric value of the same area measured in Acre (ac), and a(ha) the value in Hectare (ha). Then:
a(ha) = a(ac) × (4046.8564224 / 10000)
Equivalently, divide by how many ac fit into one ha (m² per ha divided by m² per ac):
a(ha) = a(ac) ÷ 2.47105381467165
Or: hectare = acre ÷ 2.47105381467165
Examples
Example #1: Convert 20 ac to hectare
20 ac = 20 ac × (4046.8564224/10000) ha = 8.0937128448 ha
20 ac = 20 ac ÷ 2.47105381467165 = 8.0937128448 ha
Example #2: Convert 50 ac to hectare
50 ac = 50 ac × (4046.8564224/10000) ha = 20.234282112 ha
50 ac = 50 ac ÷ 2.47105381467165 = 20.234282112 ha
Summary
To convert Acre to Hectare, multiply the value in ac by the ratio of square meters per ac divided by square meters per ha. Equivalently: value_ha = value_ac × (4046.8564224 / 10000). Numerically, 1 ac equals 0.40468564224000003 ha.
Relationship context
You are converting between US customary / imperial (Acres) and metric (SI) (Hectares). 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 4.046856e-1.
Conversion tables
| Acre (ac) | Hectare (ha) |
|---|---|
| 0.1 | 0.0404685642 |
| 1 | 0.4046856422 |
| 2 | 0.8093712845 |
| 3 | 1.2140569267 |
| 4 | 1.618742569 |
| 5 | 2.0234282112 |
| 6 | 2.4281138534 |
| 7 | 2.8327994957 |
| 8 | 3.2374851379 |
| 9 | 3.6421707802 |
| Acre (ac) | Hectare (ha) |
|---|---|
| 10 | 4.0468564224 |
| 20 | 8.0937128448 |
| 30 | 12.1405692672 |
| 40 | 16.1874256896 |
| 50 | 20.234282112 |
| 60 | 24.2811385344 |
| 70 | 28.3279949568 |
| 80 | 32.3748513792 |
| 90 | 36.4217078016 |
| 100 | 40.468564224 |