Formula Used
Rectangle: area equals length multiplied by width. Square: area equals side squared. Circle: area equals π multiplied by radius squared.
Triangle: area equals one-half base multiplied by height. Trapezoid: average the parallel sides, then multiply by height. Ellipse: multiply π by both semi-axes.
L-shaped areas subtract the cut-out rectangle. Polygon areas use the coordinate shoelace method. Final coverage includes slope and allowance.
How to Use
- Add every measurable lawn section.
- Choose each shape and measurement unit.
- Enter dimensions and identical section quantities.
- Add patios, beds, buildings, or other deductions.
- Apply slope and extra purchasing allowance.
- Enter turf, seed, soil, irrigation, and cost details.
- Select the preferred result unit and calculate.
Example Data
| Example | Inputs | Calculated area |
|---|---|---|
| Rectangular lawn | 12 m × 8 m | 96 m² |
| Circular lawn | Radius 5 m | 78.54 m² |
| Triangular corner | Base 7 m, height 4 m | 14 m² |
| Trapezoid | Bases 8 m and 5 m, height 6 m | 39 m² |
| L-shaped lawn | 10 m × 8 m minus 3 m × 2 m | 74 m² |
| Lawn with patio | 100 m² gross minus 20 m² patio | 80 m² net |
| Sloped lawn | 100 m² at 20% slope | 101.98 m² surface |
Frequently Asked Questions
How do I measure an irregular lawn?
Divide it into rectangles, triangles, circles, or trapezoids. Measure every section. Add their calculated areas together.
Can I subtract a patio or driveway?
Yes. Add each non-grass feature under excluded areas. The calculator subtracts them from gross area.
What allowance should I use for sod?
Five percent suits simple rectangular lawns. Ten percent handles curves and cutting. Complex layouts may require fifteen percent.
Does slope change the lawn area?
Yes. Sloped ground has more surface than its plan view. The slope adjustment estimates that additional surface.
What coordinates should polygons use?
Enter points as x,y pairs separated by semicolons. Keep every point in the same unit. Follow the boundary order.
How are sod rolls rounded?
The calculator divides final coverage by one roll’s area. It always rounds upward. This prevents material shortages.
Can this estimate overseeding?
Yes. Enter the recommended overseeding rate from the seed label. The required weight and bags update accordingly.
How is irrigation water calculated?
One millimetre over one square metre equals one litre. The calculator multiplies area, depth, and weekly cycles.
Are project costs exact quotations?
No. They are planning estimates from entered prices. Confirm labour, delivery, taxes, and supplier coverage before ordering.