Productive ToolboxSurvey Area Calculator
Calculate surveyed land area instantly. Supports rectangle, triangle, and polygon plots with real-time unit conversions.
Survey Area Calculator
Calculate land area for rectangle, triangle, and polygon plots. Get instant conversions to sq ft, sq m, acres, hectares, and more.
Settings
Total Area
Rectangle Dimensions
Quick Presets
What is a Survey Area Calculator?
A Survey Area Calculator is a land measurement tool that calculates the total area of a plot of land based on its shape and dimensions. It supports rectangular plots, triangular plots using Heron's formula, and irregular polygon plots using the Shoelace formula β covering the full range of real-world land shapes encountered in surveying.
The calculator accepts measurements in feet, meters, yards, or kilometers and instantly converts the result into all major area units: square feet, square meters, acres, hectares, square yards, decimal, bigha, and katha. This makes it useful for professionals and property owners worldwide.
All calculations run entirely in your browser with no data sent to any server. The tool includes preset templates for common plot sizes, a full conversion table, calculation history saved locally, and a TXT export option.
How to Use the Survey Area Calculator
Step-by-Step Guide
- 1Select your plot type: Rectangle, Triangle, or Polygon
- 2Choose your input unit (feet, meters, yards, or km)
- 3Enter the dimensions for your selected plot type
- 4Select your preferred primary output unit
- 5View the instant area result and full conversion table
- 6Copy, save, or export the result as needed
Key Features
- βRectangle, triangle, and polygon plot support
- βReal-time calculation as you type
- βInput units: feet, meters, yards, kilometers
- β8 output units including acres, bigha, katha
- βFull conversion table for all units at once
- βQuick presets for common plot sizes
- βSave history and export to TXT
Calculation Formulas
| Plot Type | Formula | Example |
|---|---|---|
| Rectangle | Area = Length Γ Width | 100 Γ 80 = 8,000 sq ft |
| Triangle (Heron's) | s = (a+b+c)/2, Area = β(s(s-a)(s-b)(s-c)) | a=10, b=12, c=14 β 58.79 sq ft |
| Polygon (Shoelace) | Area = Β½|Ξ£(xα΅’yα΅’ββ β yα΅’xα΅’ββ)| | (0,0)(100,0)(100,50)(0,50) β 5,000 sq ft |
Area Unit Conversion Reference
| Unit | Equals (sq ft) | Common Use |
|---|---|---|
| 1 Acre | 43,560 sq ft | US / UK land measurement |
| 1 Hectare | 107,639 sq ft | International / metric land |
| 1 Sq Meter | 10.764 sq ft | Metric construction |
| 1 Sq Yard | 9 sq ft | US / UK construction |
| 1 Decimal | 435.6 sq ft | Bangladesh / India |
| 1 Bigha | 14,400 sq ft | South Asia (varies by region) |
| 1 Katha | 720 sq ft | Bangladesh / India |
Example Area Calculations
| Plot | Dimensions | Sq Ft | Acres |
|---|---|---|---|
| Small Residential | 100 Γ 80 ft | 8,000 | 0.184 |
| Standard Lot | 150 Γ 100 ft | 15,000 | 0.344 |
| One Acre Plot | 209 Γ 209 ft | 43,681 | 1.003 |
| Commercial Plot | 300 Γ 200 ft | 60,000 | 1.377 |
| Triangle Plot | a=50, b=60, c=70 ft | 1,469 | 0.034 |
Who Uses This Calculator?
Land Surveyors
Quickly verify field measurements and compute plot areas from coordinate data.
Property Buyers
Understand the exact size of a plot before making a purchase decision.
Civil Engineers
Calculate land areas for site planning, grading, and construction layouts.
Farmers
Measure field and crop areas in acres, hectares, or local units like bigha.
Developers
Estimate plot sizes for residential and commercial development projects.
Legal Professionals
Verify land dimensions for property registration and legal documentation.
Frequently Asked Questions
How do I enter polygon coordinates?
Enter one coordinate pair per line in the format 'x y' (space-separated). For example: '0 0' on line 1, '100 0' on line 2, '100 50' on line 3, '0 50' on line 4. You need at least 3 points to form a valid polygon.
What is the Shoelace formula?
The Shoelace formula (also called the Surveyor's formula) calculates the area of any polygon given its vertex coordinates. It works by summing cross-products of consecutive coordinate pairs: Area = Β½|Ξ£(xα΅’yα΅’ββ β yα΅’xα΅’ββ)|.
What is Heron's formula?
Heron's formula calculates the area of a triangle when all three side lengths are known. First compute the semi-perimeter s = (a+b+c)/2, then Area = β(s(s-a)(s-b)(s-c)). The sides must satisfy the triangle inequality.
How accurate are the conversions?
The conversions use standard international factors: 1 acre = 43,560 sq ft, 1 hectare = 107,639 sq ft. Regional units like bigha and katha use common standard values (14,400 sq ft and 720 sq ft respectively), which may vary slightly by region.
Can I calculate area in meters and get the result in acres?
Yes. Select 'Meters (m)' as your input unit, enter your dimensions, then select 'Acres' as your primary output unit. The calculator automatically converts the area from square meters to acres.
What is a decimal in land measurement?
A decimal is a land unit used in Bangladesh and parts of India. 1 decimal equals 435.6 square feet or 1/100th of an acre. It is commonly used for smaller residential plots.
Related Tools
Polygon Area Calculator
Calculate the area of irregular polygon shapes using coordinates or interactive canvas plotting. Supports multiple units with real-time results.
Land Price Calculator
Calculate total land cost instantly using area size and rate per unit. Supports acre, decimal, katha, bigha, square feet, hectare, and more with multi-currency support.