Why land measurement gets confusing
What this tool does
How many square feet is each unit
Shotok, shatangsho and decimal: are they the same
A warning about the katha
How the bigha is calculated
How the plot sketch is drawn
How triangles and four-sided plots are worked out
Katha and shotok grid
Dividing the land
Price calculator
Comparing two plots
Saving the sketch as an image
How accurate the sketch is
When the deed, khatian and the real plot do not match
What land development tax is and why it is paid
Land development tax is now paid online
Steps to pay land development tax on the portal
When the tax is collected
This tool does not calculate the tax, so how does it help
Mutation (namjari) and khatian fees
Where the government information on this page comes from
Features explained
Results in every unit at once
Enter one number and see the area in hectare, acre, bigha, katha, shotok, chhatak, ayutangsho, square meter, square yard and square foot. You do not have to switch units and recalculate. Results are sorted from large to small and the row for your input unit is highlighted. If you change the katha size, the order adjusts by itself.
Four tabs for four jobs
Convert units, Sketch and split, Price calculator and Compare two plots sit on one page. Switching tabs does not erase what you typed in the others. The katha size setting works across all four.
To-scale plot sketch
The sketch is drawn from a rectangle (length and width), a triangle (three sides), a four-sided plot (four sides and one diagonal) or a trapezium (two parallel sides and the height). Every side length, the corner names, the total area and a scale bar appear on the sketch. Measurements can be in feet, hat or meters. If the measurements are impossible, the tool explains why.
Katha and shotok grid
You can lay square cells of one katha or one shotok over the sketch to see how many cells the plot equals. If the number of cells would be very large, the grid is not drawn and you are told why.
Land division
Split the plot into 2 to 12 equal parts or into a ratio such as 1:2:1 or 1/2, 1/4, 1/4. Choose the direction of the cuts (left to right or bottom to top). Each part is coloured on the sketch, and the list gives its sq ft, katha and shotok. For a rectangle it also shows where each cut falls. The list of parts can be copied.
Price calculator and plot comparison
Work out a total price from a rate, a rate from a total price, or the land a budget buys. Compare two plots in the same unit, with size, total price and price per unit side by side, plus a short summary of which is larger and which costs less per unit. Leave the prices empty and you get a size comparison only.
Save the sketch as a PNG
Save the sketch as a PNG image in one click. It is created in your browser. The image carries a note that it is an approximate sketch, not a survey. If a browser cannot create the image, an error message appears.
Adjustable katha size
By default 1 katha is 720 sq ft. If your area uses a different size, enter any value from 100 to 2,000 sq ft. The katha, chhatak and bigha results and the size of the katha grid change with it; shotok, acre, hectare, square meter and square yard do not. A value outside the range shows an error message.
Bengali or English digits, and decimals
You can type 5 or ৫, 2.5 or ২.৫. Commas and spaces inside a number are ignored. Only ‘.’ works as the decimal mark. If you enter a negative number or letters, the message tells you what to fix.
Quick example buttons
The buttons for 1 katha, 5 shotok, 1 bigha and 1 acre fill in that number and unit for you. They are handy when you just want to see how one unit compares with the others.
Copy and reset
The Copy button beside each row copies that unit’s number without grouping commas, so it can be pasted straight into a spreadsheet or calculator. Copy all results copies the whole list with unit names. Reset returns every field, unit and the katha size to the starting state.
Same use on phone, tablet and computer
On a phone the results sit in one column with large type and finger-sized buttons. On a wide screen they split into two columns. Every field has a label and the tool can be used from the keyboard. On phones the number keyboard opens for the input fields.
What can you use it for?
Comparing prices before buying land
One seller quotes a price per katha, another per shotok. Bring both plots to the same unit and work out the price per square foot to compare them fairly.
Matching the deed and khatian
Convert an area written in acres and shotok in the khatian into katha or square feet and see whether it agrees with the figure the seller gave you.
Dividing inherited land
Split the whole plot in a set ratio and see each person’s share coloured on the sketch, with the shotok or katha of every share listed. It helps when family members are talking things over; before dividing anything on the ground you need a surveyor and everyone’s agreement.
Plot size and house design
Measure the sides of a plot in feet or hat, draw it, and see how many katha or shotok it is. Save the sketch as an image to show a designer or builder.
Farmland figures
Convert land cultivated in bigha into acres or hectares to match government data, a loan application or a project document.
Preparing to pay land development tax
When you add a holding or khatian on the portal, check that the area shown agrees with the katha and shotok figures you already know.
Tool information
| Tool type | Land area unit converter |
|---|---|
| Input method 1 | One number and a unit (hectare, acre, bigha, katha, shotok, chhatak, ayutangsho, square meter, square yard or square foot) |
| Input method 2 | Shapes in the Sketch tab (rectangle, triangle, four-sided plot, trapezium) with side lengths in feet, hat or meters |
| Input method 3 | Price tab: area, a rate or total price or a budget (in taka) |
| Input method 4 | Compare tab: the area of two plots and, optionally, their total prices |
| Output | Results in ten units and the total in square feet; a to-scale sketch; the list of land shares; price and comparison figures; copy options and a PNG image |
| Sketch maths | Heron’s formula for triangles and four-sided plots; average of the parallel sides × height for trapezia |
| Land division | 2 to 12 parts; equal or by ratio (numbers or fractions); parallel cuts, split by area |
| Katha or shotok grid | Side of a 1-katha cell ≈ 26.83 ft (with a 720 sq ft katha); side of a 1-shotok cell ≈ 20.87 ft |
| Base unit | Square foot |
| Default katha size | 1 katha = 720 sq ft (can be changed between 100 and 2,000 sq ft) |
| Number input | Bengali or English digits, ‘.’ for decimals; commas and spaces are ignored |
| Decimal places in results | Up to 4 for values of 1 or more, up to 6 for values below 1 |
| Very large numbers | Numbers far larger than any real plot are rejected with an error message |
| Processing | Entirely in the browser; nothing is sent to a server for the calculation |
| Account required | No |
| Mobile support | Yes, responsive layout for phone, tablet and computer |
| 1 acre | 43,560 sq ft = 100 shotok |
| 1 hectare | 10,000 sq m ≈ 107,639.10 sq ft ≈ 247.105 shotok |
| 1 bigha | 20 katha = 14,400 sq ft (with a 720 sq ft katha) ≈ 33.0579 shotok |
| 1 katha | 720 sq ft (default) = 16 chhatak ≈ 1.6529 shotok |
| 1 shotok (shatangsho, decimal) | 435.6 sq ft = 100 ayutangsho ≈ 0.605 katha |
| 1 chhatak | 45 sq ft (with a 720 sq ft katha) |
| 1 ayutangsho | 4.356 sq ft |
| 1 square meter | ≈ 10.7639 sq ft |
| 1 square yard | 9 sq ft |
| 1 hat (length) | 1.5 ft (18 inches) |
Benefits
- One number gives you the area in ten units, with no need for separate converters.
- The katha size can be set to match your area, so the results stay close to local practice.
- Bengali digits and lakh-style grouping make results easy to read for local users.
- The numbers you enter stay in your browser and no account is needed.
- The same page also gives basic guidance on land development tax, mutation and khatian fees.
Limitations
- It is not a substitute for a legal or surveyed measurement. The actual area of land is set by the deed, khatian and official survey.
- Regional units such as kani, ganda, kora and kranti are not included.
- Katha and bigha sizes can differ by region. The bigha is always taken as 20 katha; if your area uses a different ratio, the results will not match.
- The sketch is an approximate picture. It has no direction, roads, curved boundaries or true angles; a surveyor’s measurement is needed for those.
- The sketch tab has four shapes. A plot with five or more sides cannot be drawn here; split it into triangles or four-sided plots and add the separate results.
- Land division is a purely arithmetic split by area. It does not account for roads, trees, possession or legal rights, and it is not a substitute for a legal division of property or mutation.
- The tool does not calculate land development tax or mutation fees. The Price tab only does arithmetic on the prices you enter; registration costs, taxes and broker charges are not included. For tax and fees, the government portal’s figures are final.
- Government rules, fees and portal details can change over time.
Security
This tool does not ask for your NID, mobile number, khatian number or any personal detail. You only enter numbers for the land area and size. When you pay land development tax, the government portal will ask for your NID and mobile number; give those only on the Ministry of Land’s own address, not on ToolsAli.
Privacy
The conversion runs entirely in your browser. The tool’s code does not send the numbers you enter to a server and does not save them in the browser. Closing or refreshing the page clears the fields. The Copy buttons only write to your device’s clipboard, and the sketch PNG is created in your browser and is not uploaded anywhere.
Tips
- Before buying, bring the deed and khatian figures into the same unit and compare them.
- Before working in katha or bigha, confirm how many square feet a katha is in your area and set the Katha size first.
- To compare prices, convert each plot to square feet and divide the price by that number.
- If acres, shotok and ayutangsho are written separately, bring everything to shotok as a decimal; for example 0 acre 12 shotok 50 ayutangsho is 12.5 shotok.
- Use Copy all results to keep the figures in a spreadsheet or note.
- To discuss a division among heirs, try a ratio in the Sketch and split tab to see the shares, then have a surveyor measure them on the ground.
- To compare two plots fairly, use the Compare two plots tab and look at the price per shotok or per katha side by side.
- Before paying tax or fees, or applying for mutation, confirm the current details on land.gov.bd or through 16122.
Frequently asked questions
How many square feet is 1 katha?
It is usually taken as 720 sq ft, which is about 1.6529 shotok. Some areas follow a different local katha size, though. You can change the Katha size setting in this tool to calculate with your area’s value.
How many square feet is 1 shotok? Are shotok, shatangsho and decimal the same?
1 shotok is 435.6 sq ft. Yes, in common use shotok, shatangsho and decimal are the same area: one hundredth of an acre.
How many shotok or square feet is 1 bigha?
This tool takes 1 bigha as 20 katha. With a 720 sq ft katha, a bigha is 14,400 sq ft, about 33.0579 shotok. Many people simply say 33 shotok.
How many bigha, katha and shotok are in 1 acre?
1 acre is 100 shotok, or 43,560 sq ft. With a 720 sq ft katha that is 60.5 katha and about 3.025 bigha.
How do I convert shotok to katha?
1 shotok is 435.6 sq ft and 1 katha is 720 sq ft, so multiply shotok by 0.605 to get katha. For example 5 shotok is about 3.025 katha. To go the other way, multiply katha by 1.6529 to get shotok. The tool does this automatically when you enter a number and a unit.
What if the katha size in my area is different?
Click Katha size and enter how many square feet one katha is (between 100 and 2,000). The katha, chhatak and bigha results will change to match. Confirm the size with the local land office or an experienced surveyor.
Which plot shapes can the Sketch tab draw?
Four: a rectangle (length and width), a triangle (three sides), a four-sided plot (four sides and one diagonal) and a trapezium (two parallel sides and the height). Plots with five or more sides or curved boundaries cannot be drawn; split them into triangles or four-sided plots and add the separate areas, or use a surveyor’s measurement. When measuring by hand, 1 hat is taken as 1.5 ft.
Why does the tool say a triangle or four-sided plot cannot be drawn?
A triangle exists only when any two sides together are longer than the third. In a four-sided plot the diagonal splits the plot into two triangles, and both must satisfy that rule. That is also why a four-sided plot needs a diagonal along with its four sides; four sides alone do not fix the shape. Measure again and check for a mistyped number.
How do I split land equally or in a ratio?
In the Sketch and split tab, draw the plot first, then turn on Divide the land. Choose 2 to 12 equal parts, or type a ratio such as 1:2:1 or 1/2, 1/4, 1/4. Pick the direction and each part will be coloured on the sketch, with its sq ft, katha and shotok listed below. Before dividing anything on the ground you need a surveyor’s measurement and everyone’s agreement.
Is the sketch as accurate as a survey?
No. The sketch is drawn only from side lengths, so its shape and area agree mathematically with them. Direction, roads, curved boundaries and real angles are not part of it. It is meant for discussion and rough planning, not as a substitute for a survey or a deed.
What can the Price calculator do?
Three things: work out a total price when you know the rate per shotok or katha, work out the price per unit when you know the total price and the area, and show how much land a budget buys at a given rate. It is arithmetic only; registration costs, taxes and mutation fees are not included.
How do I save the sketch as an image?
Once the sketch is drawn, a button to save it as an image (PNG) appears under it. Press it and the picture downloads to your device. The image is created in your browser and is not uploaded anywhere. If it does not download, refresh the page or try another browser.
What should I do if the deed or khatian area does not match the real plot?
First bring both figures into the same unit with this tool and check that the difference is real. If it is, have the land measured through a surveyor or the land office and take a lawyer’s advice. Do not base a purchase decision on a converter result alone.
Does this tool calculate land development tax?
No. The tax depends on the type and size of the land and on the rates in the current law, and this tool has no tax formula. Check the tax and any dues on the land.gov.bd or ldtax.gov.bd portal.
Where do I pay land development tax?
On the Ministry of Land’s land.gov.bd or ldtax.gov.bd portal, or in the Land Development Tax mobile app. You can also call the 16122 hotline for help. Registration on the portal asks for your NID number, mobile number and date of birth.
Until when can land development tax be paid?
Under the law, since 1 July 2024 the collection period is 1 July to 30 June, matching the government fiscal year. The exact deadline and rules for arrears can change, so check the current rules on the portal or through 16122.
Are my numbers sent or stored anywhere?
No. The calculation happens in your browser. The tool’s code does not send the numbers to a server and does not save them in the browser. Closing or refreshing the page clears the fields.
Can I type Bengali digits?
Yes. Bengali digits (such as ৫) and English digits (such as 5) both work. Use ‘.’ for the decimal mark, for example 2.5. Commas or spaces inside a number are ignored.