How to Convert Hectares to Ares (ha to a)
Area conversions are everyday maths in Singapore property: HDB flats are listed in square metres while condo listings and PSF prices use square feet. This guide shows how to convert hectares into ares by hand, with examples and a quick-reference table.
The conversion
To convert hectares to ares, multiply the value by 100. To go the other way, divide by the same number (or multiply by 0.01). For a quick estimate, multiply by about 100.
Ares = hectares × 100
Worked examples
- 3 ha = 300 a
- 12.5 ha = 1,250 a
- 75 ha = 7,500 a
Hectares to Ares table
| Hectares | Ares |
|---|---|
| 1 ha | 100 a |
| 2 ha | 200 a |
| 5 ha | 500 a |
| 10 ha | 1,000 a |
| 20 ha | 2,000 a |
| 25 ha | 2,500 a |
| 50 ha | 5,000 a |
| 100 ha | 10,000 a |
| 250 ha | 25,000 a |
| 500 ha | 50,000 a |
| 1,000 ha | 100,000 a |
Common questions
Is ha to a exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Ares to Hectares converter.
Mistakes to avoid
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Background
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
For any value, use the Hectares to Ares Converter or browse all area converters.
Run your own numbers: Hectares to Ares Converter