Math

Land Area Calculator

Calculate Land and Lot Area

Determine the area of a piece of land, a building lot, or an agricultural field. This calculator supports multiple shapes and automatically converts the result to acres, hectares, and other practical land measurement units.

A = l × w

Area Calculation Tips

Click to show tips

Try an Example

Pick a scenario to see how the calculator works, then adjust the values

Living Room Floor

Calculate the floor area of a 5m x 3m rectangular living room.

Key values: Rectangle · 5m x 3m · 15 m²

Circular Garden

Find the area of a circular garden bed with a 5-meter radius.

Key values: Circle · Radius: 5m · ≈78.54 m²

Triangular Plot (SSS)

Calculate the area of a triangular land plot with sides 3, 4, and 5 meters using Heron's formula.

Key values: Triangle (SSS) · Right triangle · 6 m²

Hexagonal Patio

Find the area of a regular hexagonal patio with 10m sides.

Key values: Regular Polygon · 6 sides · 10m per side

Documentation

This calculator is also known as Land Area Calculator.

Read the complete guide

Common Land Area Units

Understanding land area units:

Category	Value
1 acre	43,560 ft squared or 4,046.86 m squared
1 hectare	10,000 m squared or 2.471 acres
1 km squared	100 hectares or 247.1 acres
1 mi squared	640 acres or 259 hectares

Examples

Triangular Lot Survey

A surveyor measures a triangular lot with sides 85 m, 120 m, and 95 m.

Using Heron's formula: s = 150, area = sqrt(150 x 65 x 30 x 55) = 4,010.9 m squared, which equals approximately 0.99 acres.

Key takeaway: Heron's formula is the surveyor's best friend when perpendicular heights are hard to measure in the field.

Land Measurement Best Practices

Ensure accurate land area calculations:

Use consistent units across all measurements before calculating
For irregular lots, break the shape into triangles and rectangles
Cross-check calculations against deed or survey records
Remember that 1 acre = 43,560 ft squared and 1 hectare = 10,000 m squared

Frequently Asked Questions about Land Area Calculator

How many square feet are in an acre?

One acre equals 43,560 square feet. An acre is roughly the size of a football field without the end zones (which is 48,000 square feet including end zones).

How do I measure an irregularly shaped lot?

Divide the lot into simpler shapes (rectangles and triangles), measure and calculate each piece separately, then add the areas together. For GPS-surveyed lots with coordinate data, use the Shoelace formula.