Length and Area
actoha
Convert acres (ac) to hectares (ha).
Factor1 ac = 0.4046856 ha
Converter
ac
Accepts numbers or expressions, e.g. 150 + 14.7
Result
ha
Rendered to 6 significant figures.
Formula
Formula
ha = ac × 0.4046856
Multiply any value in acres by 0.4046856 to obtain the value in hectares.
Worked example
Convert 50 ac to ha.
- 01Start with 50 ac.
- 02Multiply by the conversion factor: 50 × 0.4046856 = 20.2343 ha.
Result50 ac = 20.2343 ha
Conversion table
| ac | ha |
|---|---|
| 1 | 0.40469 |
| 2 | 0.80937 |
| 5 | 2.0234 |
| 10 | 4.0469 |
| 20 | 8.0937 |
| 50 | 20.234 |
| 100 | 40.469 |
| 200 | 80.937 |
| 500 | 202.34 |
| 1000 | 404.69 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from ac to ha?
1 ac equals 0.4046856 ha. To convert, multiply the value in acres by 0.4046856.
How do I convert 1 ac to ha?
1 ac = 0.404686 ha. For any value, multiply by 0.4046856.
How do I convert ha back to ac?
Divide by the same factor — or equivalently, multiply by 2.471054. So 1 ha = 2.47105 ac.
When would I need to convert acre to hectare?
Area conversions are common in heat-exchanger surface area, site layout, and land-use planning where imperial and metric conventions mix.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).