🏘️ Land & property
Decimal to Square Feet Converter
Enter decimals and press Convert to get square feet. 1 decimal in square feet is 435.6. One decimal is 435.6 sq ft — one hundredth of an acre.
About the Decimal to Square Feet Converter
A decimal is one hundredth of an acre, which makes it exactly 435.6 sq ft or 40.4686 m². The unit is standard in West Bengal, Assam, Odisha and parts of Bangladesh, where plots are advertised as “3 decimal” or “5 decimal” rather than in square feet.
The arithmetic is simple and worth memorising: 1 decimal is 435.6 sq ft, so 5 decimal is 2,178 sq ft and 10 decimal is 4,356 sq ft. One acre is 100 decimal, and one bigha in the Bengal system is about 33 decimal.
How the calculation works
- 1 decimal = 435.6 sq ft = 40.468564224 m²
- 1 acre = 100 decimal
- decimal = square feet ÷ 435.6
Reference values
| Decimal | Square feet | Square metres |
|---|---|---|
| 1 decimal | 435.6 sq ft | 40.47 m² |
| 2 decimal | 871.2 sq ft | 80.94 m² |
| 3 decimal | 1,306.8 sq ft | 121.41 m² |
| 5 decimal | 2,178.0 sq ft | 202.34 m² |
| 10 decimal | 4,356.0 sq ft | 404.69 m² |
| 50 decimal | 21,780 sq ft | 2,023.43 m² |
| 100 decimal (1 acre) | 43,560 sq ft | 4,046.86 m² |
Worked examples
- 4 decimal is 1,742.4 sq ft, a typical small plot in Kolkata.
- 7.5 decimal is 3,267 sq ft, about a fifteenth of an acre.
- 33.3 decimal is roughly one Bengal bigha.
Checking the answer by hand
Multiply decimal by 435.6. For 6 decimal that is 2,613.6 sq ft. A quick sanity check: 100 decimal must come back to 43,560 sq ft, exactly one acre. If your figure for 100 is not 43,560, the factor is wrong.
Common mistakes
- Using 435 instead of 435.6, which is 0.14% out — small per plot, material across a development.
- Treating decimal as a currency of area rather than a fraction of an acre.
- Mixing decimal with cent as if they differed. They are the same area: 1/100 acre.
A last check on the numbers: 37 Decimal / cent works out to 16,117.2 Square foot, and reversing that with the same factor brings you back to 37 Decimal / cent. Because Decimal / cent to Square foot is a single multiplication, any tool that gives a different figure for the same input is rounding somewhere in the middle rather than only at the end.