How to Convert Square feet to Hectares (sq ft 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 feet into hectares by hand, with examples and a quick-reference table.
The conversion
To convert square feet to hectares, multiply the value by 9.290304e-06. To go the other way, divide by the same number (or multiply by 107,639.1041670972). Because the factor is tiny, scientific notation keeps the numbers manageable.
Hectares = square feet × 9.290304e-06
Worked examples
- 3 sq ft = 2.787091e-5 ha
- 12.5 sq ft = 0.000116 ha
- 75 sq ft = 0.000697 ha
Square feet to Hectares table
| Square feet | Hectares |
|---|---|
| 1 sq ft | 9.290304e-6 ha |
| 2 sq ft | 1.858061e-5 ha |
| 5 sq ft | 4.645152e-5 ha |
| 10 sq ft | 9.290304e-5 ha |
| 20 sq ft | 0.000186 ha |
| 25 sq ft | 0.000232 ha |
| 50 sq ft | 0.000465 ha |
| 100 sq ft | 0.000929 ha |
| 250 sq ft | 0.002323 ha |
| 500 sq ft | 0.004645 ha |
| 1,000 sq ft | 0.00929 ha |
Common questions
Is sq ft 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 feet converter.
Mistakes to avoid
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.
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.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Background
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.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Square feet to Hectares Converter or browse all area converters.
Run your own numbers: Square feet to Hectares Converter