How to Convert Square metres to Acres (m² to ac)
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 metres into acres by hand, with examples and a quick-reference table.
The conversion
To convert square metres to acres, multiply the value by 0.0002471054. To go the other way, divide by the same number (or multiply by 4,046.8564224). Because the factor is tiny, scientific notation keeps the numbers manageable.
Acres = square metres × 0.0002471054
Worked examples
- 3 m² = 0.000741 ac
- 12.5 m² = 0.003089 ac
- 75 m² = 0.018533 ac
Square metres to Acres table
| Square metres | Acres |
|---|---|
| 1 m² | 0.000247 ac |
| 2 m² | 0.000494 ac |
| 5 m² | 0.001236 ac |
| 10 m² | 0.002471 ac |
| 20 m² | 0.004942 ac |
| 25 m² | 0.006178 ac |
| 50 m² | 0.012355 ac |
| 100 m² | 0.024711 ac |
| 250 m² | 0.061776 ac |
| 500 m² | 0.123553 ac |
| 1,000 m² | 0.247105 ac |
Common questions
Is m² to ac 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 Acres to Square metres 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.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
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
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.
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.
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.
For any value, use the Square metres to Acres Converter or browse all area converters.
Run your own numbers: Square metres to Acres Converter