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🇧🇩 BD Plots · Sqft · Decimal · Katha · Bigha
Land Measurement Calculator
Calculate plot area from dimensions for rectangular, square, triangular, and L-shaped plots. Instantly converts to Square Feet, Square Metres, Katha, Bigha, Decimal, Acre, and Hectare using Bangladesh standard measurements.
Uses Dhaka standard: 1 Katha = 720 sqft · 1 Bigha = 14,400 sqft · 1 Decimal = 435.6 sqft. Last reviewed: May 2026.
How to Use
- 1Select your plot shape: Rectangle, Square, Triangle, Right Triangle, or L-Shape.
- 2Choose your measurement unit: Feet, Metres, or Yards.
- 3Enter the dimensions for your selected shape.
- 4For L-shaped plots, enter both rectangles' dimensions separately.
- 5All area units update instantly — cross-check with your deed or khatian.
Example Calculation
- Plot shape: Rectangle
- Length: 60 ft · Width: 40 ft
- Area: 60 × 40 = 2,400 sqft
- = 222.97 sqm
- = 3.33 Katha (Dhaka, 720 sqft)
- = 5.51 Decimal
0.165 Bigha · 0.0551 Acre · 0.02230 Hectare
Formula Used
Rectangle: L × W
Square: S²
Triangle: ½ × B × H
L-Shape: (L₁×W₁) + (L₂×W₂)
All in sqft · converts automatically
Metres and yards are converted to feet before calculation (1m = 3.28084 ft, 1 yd = 3 ft).
Bangladesh Land Measurement Units
Standard conversion values used in this calculator. Note that Katha and Bigha vary by district — Dhaka standards shown.
| Unit | = Square Feet | = Square Metres | Notes |
|---|---|---|---|
| 1 Decimal (Shotok) | 435.6 sqft | 40.47 sqm | 1/100th of an acre — used in most BD deeds |
| 1 Katha (Dhaka) | 720 sqft | 66.89 sqm | Dhaka standard; Sylhet = 360 sqft |
| 1 Katha (Sylhet) | 360 sqft | 33.45 sqm | Verify locally — differs by upazila |
| 1 Bigha (Dhaka) | 14,400 sqft | 1,337.8 sqm | = 20 Katha (Dhaka); Rajshahi = 25,920 sqft |
| 1 Bigha (Rajshahi) | 25,920 sqft | 2,408.3 sqm | = 36 Katha; northern Bangladesh standard |
| 1 Acre | 43,560 sqft | 4,047 sqm | International standard |
| 1 Hectare | 107,639 sqft | 10,000 sqm | International standard |
⚠️ Katha and Bigha are not standardised nationally. Values vary significantly between Dhaka, Sylhet, Rajshahi, Chittagong, and rural upazilas. Always confirm with the local sub-register office or a licensed surveyor before any transaction.
References & Data Sources
- Ministry of Land, Government of Bangladesh — Land Record and Survey Directorate (DLRS); mouza map and khatian measurement standards. land.gov.bd
- Bangladesh Standards and Testing Institution (BSTI) — national units of measurement; Decimal defined as 1/100th acre per international standard (1 acre = 43,560 sqft).
- Registration Directorate, Ministry of Law — deed registration standards; area expression in Decimal, Katha, and Gonda per Sub-Register office guidelines. minlaw.gov.bd
- RAJUK (Rajdhani Unnayan Kartripakkha) — Dhaka building and plot measurement standards; 1 Katha = 720 sqft used in RAJUK zone planning documents. rajuk.gov.bd
- Survey of Bangladesh — CS (Cadastral Survey), RS (Revisional Survey), and BS (Bangladesh Survey) khatian standards for plot area recording.
Local Katha and Bigha values are based on established practice in each district. This calculator uses Dhaka standards as default. Verify regional standards with the local AC Land office before any property transaction. Last reviewed: May 2026.
Land Measurement Tips for Bangladesh
- 1Always measure at the longest straight boundary edges — not diagonally — to avoid overstating rectangular plot area
- 2For triangular plots, the formula is ½ × Base × Height where Height is the perpendicular distance from apex to base, not a slant edge
- 3Compare your calculated area with the mouza map (CS/RS/BS) before paying baina — discrepancies of 5–10% are common in older records
- 4Dhaka uses 1 Katha = 720 sqft but this is not a national standard — confirm with the local sub-register office for your upazila
- 5RAJUK and most Dhaka city deeds express area in Decimal and Katha — use this calculator to cross-check any quoted area before signing
- 6For L-shaped plots, measure and record each rectangle separately — the two sub-areas are sometimes documented individually in mouza records
Frequently Asked Questions
How do I measure an L-shaped plot?
Split the plot into two rectangles. Measure Length 1 × Width 1 for the first section, then Length 2 × Width 2 for the second. Add the two areas together. This is the standard method used by surveyors in Bangladesh — the same approach the RS (Revisional Survey) and BS (Bangladesh Survey) records use for irregular plot documentation.
How many square feet is 1 Katha in Bangladesh?
It depends on the district. Dhaka: 1 Katha = 720 sqft (most common in property deeds and MoU documents). Sylhet: 1 Katha = 360 sqft. Some parts of Comilla and Noakhali: 1 Katha = 600 sqft. Chittagong: varies 500–720 sqft. This calculator uses the Dhaka standard (720 sqft). Always verify the local standard before signing any deed.
What is 1 Decimal or Shotok in square feet?
1 Decimal (also called Shotok) = 435.6 sqft. It is 1/100th of an acre (1 acre = 43,560 sqft). Decimal is the most widely used unit in Bangladesh property deeds, mouza maps, and DCR (Duplicate Carbon Receipt) documents. The terms Decimal and Shotok are interchangeable.
How many Katha make 1 Bigha?
In Dhaka: 1 Bigha = 20 Katha = 14,400 sqft. In Rajshahi and northern Bangladesh: 1 Bigha = 36 Katha = 25,920 sqft. In some areas of Mymensingh and Tangail, 1 Bigha = 32 Katha. The variation is significant — always check the local standard for the specific upazila. This calculator uses the Dhaka standard (1 Bigha = 14,400 sqft).
What is the difference between Khatian area and measured area?
Khatian area is the recorded area in land records (RS, CS, BS khatians) maintained by the Sub-Register office. Measured area is what you physically measure on the ground. They often differ — older surveys used different instruments and some plots have been encroached or reshaped since the last survey. Always measure the plot physically and compare with the khatian before token money or baina.
How do I convert my measurement to Decimal for a deed?
Calculate the area in sqft first, then divide by 435.6 to get Decimal. Example: a 30 ft × 40 ft plot = 1,200 sqft ÷ 435.6 = 2.75 Decimal. Property deeds (deed of sale / baina patra) in Bangladesh express area in Decimal, Katha, and Gonda. This calculator shows all three automatically once you enter dimensions.