TryBuildCalc20x30 Plot Area Calculator (Land Area, Perimeter & Cost Estimate)
Calculate 20x30 plot area in sq ft, sq yd, sq m, acres, hectares, and optional land cost. Adjust shape, dimensions, units, and rate to match your land measurement.
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 30, 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
600 sq ft
Area in Sq Ft: 600 sq ft
Area in Sq Yards: 66.67 sq yd
Area in m²: 55.74 m²
Shape Used: Rectangle
Perimeter
100 ft
Perimeter in Feet: 100 ft
Perimeter in Meters: 30.48 m
Perimeter in Yards: 33.33 yd
Land Unit Conversion
Sq Ft: 600
Sq Yards: 66.67
m²: 55.74
Acres: 0.0138
Hectares: 0.0056
Approximate results for planning only. Verify with a professional.
Looking for the verification checklist, reference tables, or tips and mistakes?See the complete Plot Area Calculator.
20x30 plot area calculation
This page is pre-filled for a compact 20 ft x 30 ft plot — a size often used for small homes and early boundary planning — giving an area of 600 sq ft and a perimeter of 100 ft.
At exactly half the area of the 30x40 plot on this calculator's other example page, 600 sq ft is a useful reference point for comparing how area scales with plot dimensions.
- Plot: 20 ft x 30 ft.
- Area: 600 sq ft.
- Perimeter: 100 ft.
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 = 30 ft
- Frontage / Width = 20 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
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
This page keeps things focused on the calculation above. For the full construction guide — verification checklist, reference tables, usage steps, tips, common mistakes, and limitations.See the complete Plot Area Calculator.