Lawn Area Calculator
Calculate lawn square footage for rectangles, circles, triangles and L-shapes.
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What this tool does
The Lawn Area Calculator measures your lawn in square feet using simple shapes, lets you subtract hardscape, and converts to acres and square yards (how sod is sold).
How to use the Lawn Area Calculator
- Pick the shape that best matches the lawn section.
- Enter the dimensions.
- Subtract areas that aren't grass.
- Repeat for other sections and add them together.
Formula
Rect = L × W; Circle = π × (D ÷ 2)²; Triangle = ½ × B × H; L = L1 × W1 + L2 × W2
- L, W
- Length, width
- D
- Diameter
- B, H
- Base, height
Worked example
A 60 × 40 ft rectangular back lawn.
Inputs
- ShapeRectangle
- Length / diameter / base60 ft
- Width / height40 ft
- Second rectangle length20 ft
- Second rectangle width15 ft
- Subtract (patio, house, beds)0 sq ft
Result
- Lawn area2,400 sq ft
- Acres0.0551 ac
- Square yards (sod)266.7 sq yd
Area unit conversions
| Unit | Square feet |
|---|---|
| 1 square yard | 9 |
| 1 square meter | 10.764 |
| 1 acre | 43,560 |
| 1 hectare | 107,639 |
Results explained
- Lawn area
- Square feet of grass.
- Acres
- Area ÷ 43,560.
- Square yards
- For ordering sod.
Frequently asked questions
Break it into rectangles, circles and triangles, calculate each, and add them, subtracting the house and patios.
Roughly 10,000 sq ft (about a quarter acre), though suburban lots vary widely.
43,560 square feet.
By the square yard or pallet; a pallet typically covers 400–500 sq ft.
Approximate curves with several triangles or use the circle for rounded sections.