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Field Area Calculator

By Rafay Javed

Updated June 16, 2025

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Field Shape: Rectangular Circular Irregular Polygon

Unit System: Metric (m, m², ha) US (ft, ft², acres)

Length (m):

Width (m):

Radius (m):

Coordinates (x,y per line):

Calculate Reset

Area (m²):

Area (ha):

The Field Area Calculator helps farmers, engineers, and land surveyors quickly measure the area of a piece of land. Knowing the exact area is very important for planning crops, irrigation, fencing, and budgeting. This tool removes the guesswork by using basic measurements or GPS coordinates to give accurate results for fields of any shape. This calculator belongs to the Land Measurement Calculator category and is used in agriculture, construction, and landscaping.

g">formula of Field Area Calculator

1. For a rectangular or square field:
   Field Area = Length × Width

Where:
Length is the longer side (in meters, feet, etc.)
Width is the shorter side (same unit)
Field Area comes out in square units like m², ft², acres, or hectares

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For an irregular polygon-shaped field (using coordinates):
Field Area = (1/2) × | Σ (xᵢ yᵢ₊₁ − xᵢ₊₁ yᵢ) |

Where:
xᵢ, yᵢ are the coordinates of each corner point, listed in order around the boundary
Connect the last point back to the first to close the shape

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For a circular field:
Field Area = π × r²

Where:
r is the radius of the field
π is about 3.14159

Common unit conversions

:
1 acre = 43,560 ft²
1 hectare = 10,000 m²

Common Field Size and Unit Reference Table

This table shows simple conversions and common sizes that people often check.

Unit	Square Feet (ft²)	Square Meters (m²)	Acres	Hectares
1 Acre	43,560	4,046.86	1	0.4047
1 Hectare	107,639.1	10,000	2.471	1
Football Field	~57,600	~5,350	1.32	0.53

This makes it easy to compare your field to standard units.

Let’s look at three quick examples.

1. Rectangular Field:
   Length = 200 feet
   Width = 150 feet
   Area = 200 × 150 = 30,000 ft²
   In acres: 30,000 ÷ 43,560 ≈ 0.69 acres
2. Circular Field:
   Radius = 50 meters
   Area = π × (50)² = 3.14159 × 2,500 = 7,853.98 m²
3. Irregular Field (simple triangle as an example):
   Points: (0,0), (50,0), (50,40)
   Area = (1/2) × | (0×0 + 50×40 + 50×0) − (50×0 + 50×0 + 0×40) |
   Area = (1/2) × | (0 + 2000 + 0) − (0 + 0 + 0) |= (1/2) × 2000 = 1,000 units²

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