Calc4Living

Gardening & Landscaping · Free calculator

Lawn Area Calculator

Calculate the area of a rectangular, circular or triangular lawn in square meters, square feet and acres.

Your measurements

Prefilled values are editable examples. Measure your own space and check the selected units. Allowance and bed count may be left blank; all other fields are required.

Enter your measured dimension in the selected unit. Zero gives zero area or volume.

Enter your measured dimension in the selected unit. Zero gives zero area or volume.

Changing units converts the current measurements; changing any input clears the previous result.

Your estimate

Lawn area

Review the example measurements, select your units and calculate. No quantities have been calculated yet.

How do I calculate the area of my lawn?

Rectangle: length × width. Circle: π × (diameter ÷ 2)². Triangle: base × perpendicular height ÷ 2. Convert linear dimensions before calculating area.

Worked example

A 10 m × 5 m rectangle covers 50 m² (about 538.1955 ft² or 0.0123553 acres). A 10 m diameter circle covers about 78.5398 m². A triangle with base 10 m and perpendicular height 5 m covers 25 m².

Unit conversions

1 ft = 0.3048 m; 1 in = 0.0254 m; 1 cm = 0.01 m. 1 yd³ = 27 ft³ = 0.764554857984 m³; 1 liter = 0.001 m³. 1 acre = 4,046.8564224 m². 1 lb = 0.45359237 kg.

Assumptions & limitations

  • This tool calculates simple shapes from measurements you provide; it does not automatically measure an irregular lawn or use map data.
  • For an irregular lawn, split it into non-overlapping rectangles, circles or triangles, calculate each separately and add the areas. Subtract paths and beds separately.
  • Use the perpendicular triangle height, not the sloping edge. Circle input is the full diameter, not the radius. Assumes a flat horizontal area; slope surface area is not modeled.