TryBuildCalcPlot Area Calculator (Square Feet, Square Yards, Square Meters, Acres & Cost)
Calculate land area, perimeter, unit conversions, and estimated cost from plot dimensions.
Supports rectangle, square, triangle, circle, trapezoid, irregular (custom-point) plots, and common plot sizes like 30 × 40 and 40 × 60.
Calculate plot area, perimeter, conversions, and estimated land value.
🕒 Last updated: July 14, 2026
Inputs
Plot Dimensions
ℹ️Depth is the distance from frontage/road side to the rear boundary.
ℹ️Frontage is the road-facing plot width, such as 30 ft road-facing and 40 ft depth.
Unit & Cost Settings
ℹ️Optional. Enter land rate and choose whether it is per sq ft, sq yd, m², acre, or hectare.
Deduct road widening, setback, or corner chamfer area to see the usable construction area.
Plot Area
1,200 sq ft
Area in Sq Ft: 1,200 sq ft
Area in Sq Yards: 133.33 sq yd
Area in m²: 111.48 m²
Shape Used: Rectangle
Perimeter
140 ft
Perimeter in Feet: 140 ft
Perimeter in Meters: 42.67 m
Perimeter in Yards: 46.67 yd
Land Unit Conversion
Sq Ft: 1,200
Sq Yards: 133.33
m²: 111.48
Acres: 0.0275
Hectares: 0.0111
Approximate results for planning only. Verify with a professional.
What Does This Plot Area Calculator Calculate?
A plot area calculator helps you quickly measure land area based on plot dimensions and shape. It is commonly used as a land area calculator or plot size calculator to estimate area in square feet, square yards, and square meters for residential, commercial, and agricultural land.
This tool supports rectangle, square, triangle, circle, and trapezoid plots, plus an irregular (custom points) mode for boundaries that don't match a simple shape — calculating exact area and perimeter directly from the corner measurements instead of requiring you to split the plot yourself. It also allows unit conversion and optional plot cost estimation based on rate per square foot, square yard, or square meter.
It is useful for property buyers, civil engineers, architects, builders, and homeowners who need accurate land measurement for planning, valuation, and construction.
Note that this calculator estimates plot (land) area only — not built-up area or carpet area, which depend on the specific building design and are always smaller than the plot area. See the FAQ below for how the three differ.
Plot Area Calculator Formula & Calculation
Step 1 - Select the plot shape
The calculator first applies the correct formula for the selected plot shape. Rectangle and square plots use side dimensions, triangle plots use base and perpendicular height, circular plots use radius or diameter, and trapezoid plots use two parallel sides with height.
Rectangle Area = Length x Width
Square Area = Side x Side
Triangle Area = 0.5 x Base x Height
Circle Area = pi x Radius²
Trapezoid Area = 0.5 x (Side A + Side B) x Height
Step 1b - Irregular (polygon) plots use the shoelace formula
For an irregular plot entered as corner points (X₁,Y₁), (X₂,Y₂) ... (Xₙ,Yₙ) walked in order around the boundary, the exact area comes from the shoelace formula — named for the crisscross pattern the multiplication makes when written out.
Area = 0.5 × |Σ(Xᵢ × Yᵢ₊₁ − Xᵢ₊₁ × Yᵢ)|
(sum runs over every consecutive pair of corners, wrapping the last point back to the first)
Worked example with the default 6-point L-shaped plot — (0,0), (40,0), (40,20), (20,20), (20,30), (0,30) in feet:
(0×0 − 40×0) + (40×20 − 40×0) + (40×20 − 20×20) + (20×30 − 20×20) + (20×30 − 0×30) + (0×0 − 0×30)
= 0 + 800 + 400 + 200 + 600 + 0 = 2,000
Area = 0.5 × |2,000| = 1,000 sq ft
Step 2 - Calculate perimeter
Rectangle Perimeter = 2 × (Length + Width)
Square Perimeter = 4 × Side
Circle Circumference = 2 × π × Radius
Triangle and trapezoid perimeter are estimated from the entered height and sides.
Polygon Perimeter = sum of the straight-line distance between every consecutive pair of corners, including the closing edge back to the first point.
Step 3 - Convert area units
1 sq yd = 9 sq ft
1 m² = 10.7639 sq ft
1 acre = 43,560 sq ft
1 hectare = 10,000 m²
Step 4 - Estimate plot value
Example Plot Area Calculation Using This Calculator
These examples show how the calculator works for every supported plot shape. The currently selected shape uses your entered inputs where possible, while the remaining shapes use default example values.
You haven't entered a land rate above, so these examples use a default placeholder rate: ₹ 4,000 per sq ft. Enter your own rate in the calculator to see the estimated value calculated with real figures.
Rectangle plot example
Selected shapeA common residential rectangular plot using frontage and depth.
- Depth / Length = 40 ft
- Frontage / Width = 30 ft
- Rate = ₹ 4,000 per sq ft
Step 1 - Plot area
Step 2 - Unit conversion
Area in Sq Yards = 133.33 sq yd
Area in m² = 111.48 m²
Area in Cent = 2.75 cent
Step 3 - Perimeter
Step 4 - Estimated value
Square plot example
A square plot where all sides are equal.
- Side = 30 ft
- Rate = ₹ 4,000 per sq ft
Step 1 - Plot area
Step 2 - Unit conversion
Area in Sq Yards = 100 sq yd
Area in m² = 83.61 m²
Area in Cent = 2.07 cent
Step 3 - Perimeter
Step 4 - Estimated value
Triangle plot example
A triangular plot measured by base and perpendicular height.
- Base = 30 ft
- Height = 40 ft
- Rate = ₹ 4,000 per sq ft
Step 1 - Plot area
Step 2 - Unit conversion
Area in Sq Yards = 66.67 sq yd
Area in m² = 55.74 m²
Area in Cent = 1.38 cent
Step 3 - Perimeter
Step 4 - Estimated value
Circle plot example
A circular plot or circular landscape area measured by radius.
- Radius = 20 ft
- Rate = ₹ 4,000 per sq ft
Step 1 - Plot area
Step 2 - Unit conversion
Area in Sq Yards = 139.63 sq yd
Area in m² = 116.75 m²
Area in Cent = 2.88 cent
Step 3 - Perimeter
Step 4 - Estimated value
Trapezoid plot example
A plot with two parallel sides and a perpendicular height.
- Parallel Side A = 50 ft
- Parallel Side B = 30 ft
- Height = 40 ft
- Rate = ₹ 4,000 per sq ft
Step 1 - Plot area
Step 2 - Unit conversion
Area in Sq Yards = 177.78 sq yd
Area in m² = 148.64 m²
Area in Cent = 3.67 cent
Step 3 - Perimeter
Step 4 - Estimated value
Irregular (L-shaped) plot example
An L-shaped plot entered as boundary corner points, walked in order from a reference corner.
- Point 1 (X, Y) = 0, 0 ft
- Point 2 (X, Y) = 40, 0 ft
- Point 3 (X, Y) = 40, 20 ft
- Point 4 (X, Y) = 20, 20 ft
- Point 5 (X, Y) = 20, 30 ft
- Point 6 (X, Y) = 0, 30 ft
- Rate = ₹ 4,000 per sq ft
Step 1 - Plot area
Step 2 - Unit conversion
Area in Sq Yards = 111.11 sq yd
Area in m² = 92.9 m²
Area in Cent = 2.3 cent
Step 3 - Perimeter
Step 4 - Estimated value
Essential Checklist+−
Complete these critical checks before approving the work or proceeding to the next construction stage.
✓Measurement and Input+-
- Dimensions were physically measured on site with a tape — not taken from sale documents or property cards.
- All four boundary lengths were measured independently — opposite sides of a plot are rarely equal.
- For irregular plots, either the polygon (custom points) mode was used with real boundary measurements, or the plot was divided into triangles/rectangles and each section measured separately — not eyeballed as one averaged shape.
- Dimensions were entered in the correct unit — do not mix metres and feet in the same calculation.
- For quadrilateral plots, the angle or diagonal entered matches the site geometry — not an assumed 90°.
- For circular plots, the radius/diameter toggle matches what was actually measured on site — entering a measured diameter into the radius field (or vice versa) quadruples or quarters the resulting area.
- For triangular and trapezoid plots, the perpendicular (vertical) height was entered — not the sloping side length, which overstates the area if used directly.
✓Irregular Plot (Polygon) Verification+-
- Every boundary corner was recorded, walked in one consistent direction around the plot — mixing clockwise and counter-clockwise entries for different corners produces an incorrect area.
- All corner offsets (X, Y) were measured from the same fixed reference point and baseline direction — switching reference points partway through introduces cumulative error.
- The number of corner points entered matches the actual number of direction changes on the boundary — a missed corner silently cuts off part of the plot.
✓Unit Conversion+-
- The output unit matches what is required for the task at hand — sq ft, m², sq yd, acres, or hectares as applicable.
- If using a local/regional land unit (such as cent, guntha, ankanam, marla, or kanal), the exact regional definition is confirmed first — these units vary by country and even by state/province, not just by name.
✓Legal and Site Verification+-
- The calculated area was compared against the area stated in the title deed, land registry extract, or official survey record — discrepancies must be resolved before construction.
- Setback and road-widening reservations were identified — these reduce the usable plot area below the total area.
✓Deductions, Cost & Value Verification+-
- Road widening, setback, and corner-chamfer deductions were measured on site or taken from an approved layout plan — not guessed as a round percentage of the gross area.
- The deduction unit (sq ft, sq yd, or m²) matches the unit the gross area is being reasoned about in — mixing units here silently under- or over-states the net usable area.
- The rate unit (per sq ft, sq yd, m², acre, or hectare) matches how the rate was actually quoted — applying a per-acre rate as if it were per-sq-ft (or vice versa) produces a wildly wrong estimated value.
Full QC Checklist+−
Verify plot measurements, units, boundaries, and legal area assumptions before relying on the result.
✓Measurement and Input+-
- Dimensions were physically measured on site with a tape — not taken from sale documents or property cards.
- All four boundary lengths were measured independently — opposite sides of a plot are rarely equal.
- For irregular plots, either the polygon (custom points) mode was used with real boundary measurements, or the plot was divided into triangles/rectangles and each section measured separately — not eyeballed as one averaged shape.
- Diagonal measurements were taken to verify right angles on rectangular plots.
- Dimensions were entered in the correct unit — do not mix metres and feet in the same calculation.
- For quadrilateral plots, the angle or diagonal entered matches the site geometry — not an assumed 90°.
- For circular plots, the radius/diameter toggle matches what was actually measured on site — entering a measured diameter into the radius field (or vice versa) quadruples or quarters the resulting area.
- For triangular and trapezoid plots, the perpendicular (vertical) height was entered — not the sloping side length, which overstates the area if used directly.
✓Irregular Plot (Polygon) Verification+-
- Every boundary corner was recorded, walked in one consistent direction around the plot — mixing clockwise and counter-clockwise entries for different corners produces an incorrect area.
- All corner offsets (X, Y) were measured from the same fixed reference point and baseline direction — switching reference points partway through introduces cumulative error.
- The number of corner points entered matches the actual number of direction changes on the boundary — a missed corner silently cuts off part of the plot.
- For a large or complex boundary, the calculated area was sanity-checked against a rough estimate (e.g. bounding rectangle minus obvious cut corners) before relying on the exact figure.
✓Unit Conversion+-
- The output unit matches what is required for the task at hand — sq ft, m², sq yd, acres, or hectares as applicable.
- If using a local/regional land unit (such as cent, guntha, ankanam, marla, or kanal), the exact regional definition is confirmed first — these units vary by country and even by state/province, not just by name.
- Any regional land unit conversion used is checked against a local authoritative source before being relied on for legal or high-value decisions, since this calculator's regional conversions are common reference values, not a universal legal standard.
- For legal or sale purposes, area was cross-checked against the registered deed, land registry extract, or official survey record.
✓Legal and Site Verification+-
- The calculated area was compared against the area stated in the title deed, land registry extract, or official survey record — discrepancies must be resolved before construction.
- Setback and road-widening reservations were identified — these reduce the usable plot area below the total area.
- The corner markers or boundary stones are clearly visible and undisturbed on site.
- For large or disputed plots, a licensed surveyor's measurement supersedes tape-measure calculations.
- Floor Area Ratio (FAR/FSI) and ground coverage calculations use the net plot area after deducting road reservations, not the gross plot area.
- Municipal or local authority approval drawings show dimensions that may differ from the actual site — always verify on ground.
✓Deductions, Cost & Value Verification+-
- Road widening, setback, and corner-chamfer deductions were measured on site or taken from an approved layout plan — not guessed as a round percentage of the gross area.
- The deduction unit (sq ft, sq yd, or m²) matches the unit the gross area is being reasoned about in — mixing units here silently under- or over-states the net usable area.
- The land rate entered reflects the current market rate for this specific location and plot category (corner plot, road-facing, interior) — a generic area-average rate can be significantly off for a specific plot.
- The rate unit (per sq ft, sq yd, m², acre, or hectare) matches how the rate was actually quoted — applying a per-acre rate as if it were per-sq-ft (or vice versa) produces a wildly wrong estimated value.
- The estimated plot value is treated as an indicative planning figure only, and cross-checked against an actual valuation, registration/circle rate, or broker quote before any transactional decision.
Common plot size conversion table
| Plot Size | Area in Sq Ft | Area in Sq Yards | Area in Sq Meters |
|---|---|---|---|
| 20 × 30 ft | 600 | 66.67 | 55.74 |
| 25 × 40 ft | 1,000 | 111.11 | 92.9 |
| 30 × 40 ft | 1,200 | 133.33 | 111.48 |
| 30 × 50 ft | 1,500 | 166.67 | 139.35 |
| 30 × 60 ft | 1,800 | 200 | 167.23 |
| 36 × 50 ft | 1,800 | 200 | 167.23 |
| 40 × 60 ft | 2,400 | 266.67 | 222.97 |
| 60 × 40 ft | 2,400 | 266.67 | 222.97 |
| 50 × 80 ft | 4,000 | 444.44 | 371.61 |
These common plot size conversions are widely used in India for land measurement, property valuation, and construction planning.
How to Use the Plot Area Calculator
- Select the plot shape — or choose “Irregular (Custom Points)” if the boundary doesn't match a simple shape.
- Choose a common plot preset or enter custom dimensions (or corner points, for irregular plots).
- Select the input unit as feet, meters, or yards.
- Choose the preferred output unit for the main result.
- Enter an optional land rate to estimate plot value.
- Review area, perimeter, conversions, and estimated cost in the result card.
Plot Measurement Tips & Best Practices
- Verify right angles with the 3-4-5 method
- Measure both diagonals — they should be equal for a true rectangle
- For road-facing plots, confirm whether the stated frontage includes or excludes the road setback before comparing to sale documents
- For an irregular plot, pick one corner as your reference point, then walk the boundary in a single consistent direction recording each corner's offset — mixing directions partway through gives a wrong area.
- For a very complex boundary, sanity-check the polygon result against a rough bounding rectangle before trusting the exact figure.
Common Mistakes When Calculating Plot Area
- Confusing plot (land) area with built-up area or carpet area — a “1,200 sq ft plot” and a “1,200 sq ft flat” are very different quantities, and mixing them up leads to wrong material and cost estimates.
- Mixing input units mid-calculation, such as entering length in feet and width in meters — always confirm the same unit applies to every dimension before reading the result.
- Assuming a plot is a perfect rectangle without measuring both diagonals — real plots are frequently a few degrees off-square, which the diagonal check catches immediately.
- Splitting an irregular plot into rectangles/triangles by eye instead of using the polygon mode or careful section-by-section measurement — small errors in each piece compound into a noticeably wrong total.
- Entering irregular-plot corner points in an inconsistent order (jumping around the boundary instead of walking it in one direction) — this produces an area that's silently wrong rather than throwing an error.
- Using the plot's gross area for construction costing without deducting setback, road-widening, or corner-chamfer reservations — the usable/buildable area is often meaningfully smaller than the total plot area.
- Treating a regional land unit conversion (cent, guntha, marla, etc.) as fixed and universal, when the exact value can vary by region — always confirm the local definition for legal or high-value transactions.
Plot Area Calculator Limitations
- This calculator is for quick area estimation and unit conversion, not a legal survey.
- Actual land records should be verified with survey drawings, title documents, or a licensed surveyor.
- Triangle perimeter is estimated as an isosceles triangle from base and height.
- Trapezoid perimeter is estimated using equal non-parallel sides.
- The irregular (polygon) mode assumes a simple boundary that doesn't cross itself — it isn't designed for a plot with a genuine hole or a self-intersecting outline.
- Regional land unit conversions (cent, guntha, ankanam, marla, kanal) are common reference values, not a substitute for the locally defined legal conversion where one exists.
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