Decimal to Square Feet Converter

Convert decimals to square feet (decimal to sq ft)

To convert decimals to square feet, multiply the value in decimals by 435.6. Land in Bihar, Jharkhand, Odisha and West Bengal is registered in decimals (dismil), while houses are planned in square feet. This decimal to square feet converter works both ways: type decimals or square feet into either box above and the other box, the worked formula and the chart below update as you type.

A decimal — dismil in Bihar and Jharkhand, shatak or satak in Bengal and Bangladesh — is one hundredth of an acre, 435.6 sq ft. Bihar’s Revenue Glossary (Revenue & Land Reforms Department, 2025) gives the same value. Land records in Bihar, Jharkhand, Odisha and West Bengal count small plots in decimals. One decimal is 435.6 square feet.

A square foot (sq ft) is a square one foot on each side — exactly 0.09290304 m², because the international foot is 0.3048 m. Going the other way, one square foot equals 0.00229568 decimals. Flats, houses and plots in India are advertised, approved and taxed in square feet, so it is the common language between local land units.

How to convert decimal to square feet with this tool

1. Type a number into the Decimal (dismil) (decimal) box — it starts at 1 decimal as an example.
2. Read the answer in the Square feet (sq ft) box and in the result panel, which also shows the formula with your number.
3. To go the other way, type into the square feet box and the decimals value is worked out backwards. For other units, open the area converter.
4. Choose how many decimal places you want, or tap a quick value such as 2 decimals, 5 decimals, 10 decimals.
5. Press Copy result to paste the conversion into a message, spreadsheet or note.

Decimal to Square Feet converter features

Decimal to Square Feet formula

The formula is sq ft = decimals × 435.6. It is exact because a decimal is 1/100 of an acre of exactly 43,560 square feet.

The reverse formula is decimals = sq ft ÷ 435.6. Three worked examples:

• One decimal: 1 decimal × 435.6 = 435.6 sq ft
• A 5 decimal plot: 5 decimals × 435.6 = 2,178 sq ft
• A 10 decimal plot: 10 decimals × 435.6 = 4,356 sq ft

Decimal, katha and bigha by region

A decimal is 1/100 acre wherever it is used, so 10 decimals = 4,356 sq ft. What changes from state to state is the unit around it: a West Bengal katha is 720 sq ft (about 1.65 decimal), while a Bihar kattha is about 1,361 sq ft around Patna. The NGDRS survey of state land units notes that in Odisha house-site plots are often reckoned at 435 sq ft per decimal rather than 435.6 — check which figure your document uses.

For katha and bigha by state, use the katha to square feet and bigha to square feet converters.

Decimal to Square Feet quick reference

The values people look up most often, worked out with the exact factor:

• 1 decimal = 435.6 sq ft
• 1 sq ft = 0.00229568 decimals
• 2 decimals = 871.2 sq ft
• 5 decimals = 2,178 sq ft
• 10 decimals = 4,356 sq ft
• 20 decimals = 8,712 sq ft

Quick tip: Multiply by about 436 for a quick check: 4 decimals = 1,742.4 sq ft.

Related conversions: Gaj to Square Feet, Guntha to Square Feet and the full area converter.

Decimal to Square Feet conversion table

Values in square feet are rounded to 4 decimal places (more for very small numbers). For any value not listed, type it into the converter above.