How to Convert Square kilometres to Hectares (km² to ha)
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 square kilometres into hectares by hand, with examples and a quick-reference table.
The conversion
To convert square kilometres to hectares, 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.
Hectares = square kilometres × 100
Worked examples
- 3 km² = 300 ha
- 12.5 km² = 1,250 ha
- 75 km² = 7,500 ha
Square kilometres to Hectares table
| Square kilometres | Hectares |
|---|---|
| 1 km² | 100 ha |
| 2 km² | 200 ha |
| 5 km² | 500 ha |
| 10 km² | 1,000 ha |
| 20 km² | 2,000 ha |
| 25 km² | 2,500 ha |
| 50 km² | 5,000 ha |
| 100 km² | 10,000 ha |
| 250 km² | 25,000 ha |
| 500 km² | 50,000 ha |
| 1,000 km² | 100,000 ha |
Common questions
Is km² to ha 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 Hectares to Square kilometres converter.
Mistakes to avoid
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
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.
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.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
For any value, use the Square kilometres to Hectares Converter or browse all area converters.
Run your own numbers: Square kilometres to Hectares Converter