How to Measure Land Without a Surveyor
Four ways to get the area of a plot yourself, what each one is good for, and where each one goes wrong. Use them to screen plots — then pay an amin for the one you buy.
You are standing on a plot. The seller says it is 6 katha. You have no idea whether that is true.
Hiring an amin for every plot you look at is slow and expensive, and you probably want to filter out the obvious mismatches first. Here is how to get a reliable estimate yourself.
The short version: if the plot is a neat rectangle, measure two sides and multiply. If it is not, mark the corners on a satellite map and let the app do the geometry. Use a surveyor only for the plot you actually decide to buy.
Method 1: rectangle, measured by tape
Works when the plot has four corners and square angles.
- Measure the length in feet.
- Measure the width in feet.
- Multiply them for square feet.
- Divide: ÷ 720 for katha, ÷ 435.6 for shotok, ÷ 14,400 for bigha.
A plot 60 ft × 48 ft is 2,880 sq ft, which is 4 katha or 6.6 shotok. Use the conversion tables if you need another unit.
Check the corners are square. Measure both diagonals. On a true rectangle they are equal. If one diagonal is longer, the plot is a parallelogram and this method will overstate the area.
Method 2: triangles, for four-sided plots that are not square
Most real plots have at least one crooked side. You can still do it by hand.
Split the plot into two triangles by measuring one diagonal. For each triangle you need the base and the perpendicular height, then:
Area = ½ × base × height
Add the two triangles together. It is fiddly on uneven ground, and getting a true perpendicular height without equipment is harder than it sounds — but it beats assuming a rectangle.
Method 3: mark the corners on a satellite map
This is the one most people should use, and it needs no tape at all.
Open a satellite map, tap each corner of the plot in order, and the area inside those points is calculated for you. It handles any number of sides, so a five-sided or L-shaped plot is no harder than a rectangle.
What makes it practical:
- You do not have to be there. Check a plot before you spend a day travelling to it.
- Irregular shapes are no problem. No splitting into triangles, no arithmetic.
- You can compare plots quickly. Measure five listings in an evening.
The limit is that you have to know where the boundaries are. On open farmland with visible edges, that is easy. Inside a dense area where one boundary wall looks like another, it is not — and that is when you go and look.
Method 4: walking with GPS
Some apps record your position as you walk the perimeter.
It sounds ideal and is usually the least accurate option. Consumer phone GPS drifts by several metres, and on a small plot that drift is a large share of the total. On a 3 katha plot it can be the difference between 3 and 4.
Use it for rough farmland figures. Do not use it to decide a price.
How accurate is each method?
| Method | Good for | Main weakness |
|---|---|---|
| Tape, rectangle | Regular plots you can walk | Wrong if corners are not square |
| Triangles | Four-sided crooked plots | Hard to get a true height |
| Satellite map | Any shape, from anywhere | Needs visible boundaries |
| GPS walking | Large farmland | Drift; poor on small plots |
| Licensed surveyor | Anything legal or final | Cost and time |
When you genuinely need a surveyor
Self-measuring is for screening. Pay an amin when:
- You have decided to buy and the price depends on the exact area
- Land is being divided between family members
- There is any disagreement with a neighbour about where a boundary sits
- The figure has to appear on a document
- The plot needs matching against the mouza map
A phone measurement tells you whether a claim is roughly honest. It does not settle anything legally, and nobody should pretend otherwise.
Measuring on your phone
Area and Plot Measurement does methods 1 to 3 without the arithmetic.
- Map calculator — tap the corners on a satellite or street map and watch the area update as you place each point.
- Shape calculator — enter dimensions for a rectangle or triangle, or add as many vertices as an irregular plot needs.
- Every unit at once — katha, bigha, shotok, acre and square feet from the same measurement.
- Saved history — name each plot, add notes, mark favourites, and compare listings later.
- Google account backup, so a lost phone does not lose your records.
- Bangla and English, switchable from the menu.
It is Android only, and — worth repeating — it is a measuring tool, not a survey. Use it to decide which plots are worth a visit, then bring an amin to the one you choose.
Before you go and look
Measure the plot on the map first. If the area is nowhere near what the seller claims, you have saved yourself the trip.
And when the number does look right, convert it into whatever unit the deed uses before you discuss price — because katha, shotok and bigha get mixed up constantly, and the mix-up is rarely in your favour.
And if your figure comes out well below what the paperwork says, that has five usual explanations — not all of which mean someone is lying.
Frequently asked questions
How do I calculate land area in katha?
Measure length and width in feet, multiply for square feet, then divide by 720 to get katha. For shotok divide by 435.6, and for bigha divide by 14,400. This only works if the corners are square — check by measuring both diagonals, which are equal on a true rectangle.
How do I measure an irregular plot?
Length times width only works for rectangles. Either split the plot into triangles and add them, or mark every corner on a satellite map and let an app calculate the enclosed area, which handles any number of sides.
Is GPS accurate enough to measure land?
Usually not for small plots. Consumer phone GPS drifts by several metres, and on a three katha plot that drift is a large share of the total. It is acceptable for rough farmland figures and a poor basis for a price.
Can I measure land without going there?
Yes, if you know where the boundaries are. Marking the corners on a satellite map gives you the area without visiting, which is useful for filtering listings before you spend a day travelling.
Do I still need a surveyor?
Yes, for anything final. Self-measuring is for screening plots. Pay a licensed amin once you have decided to buy, when land is being divided, when a boundary is disputed, or when the figure has to appear on a document.