About the lawn area calculator
Seed, sod, fertilizer, and water all start with your lawn’s area. Few yards are a perfect rectangle, so this calculator lets you add as many shapes as you need and subtract the areas that aren’t grass.
Enter each shape’s dimensions, and the total updates instantly in square feet, square meters, square yards, and acres.
How to use this calculator
- Sketch your yard and split the lawn into rectangles, circles, triangles, and trapezoids.
- Add each shape and enter its measurements.
- Use “Subtract” for beds, patios, sheds, and other areas inside the lawn.
- Use the total in the seed, sod, or fertilizer calculators.
Worked examples
- Main lawn 50 × 40 ft = 2,000 sq ft
- Subtract a 10 × 10 ft patio = 100 sq ft
1,900 sq ft of lawn.
Measurement guidance
Use a long tape or wheel
A 100 ft tape or a measuring wheel is much faster than a short tape for lawns. Measure along the ground.
Curved edges
Approximate a curved edge with a trapezoid or two, or treat a rounded corner as a quarter of a circle (enter the full circle and divide mentally by four).
Frequently asked questions
How do I measure an irregular lawn?
Divide it into simple shapes, measure each one, add them together, and subtract anything inside the lawn that isn’t grass.
How many square feet is an acre?
43,560 square feet, or about 4,047 square meters.
Can I use satellite maps?
Many map tools include an area measurement feature that gives a useful cross-check for large lawns. Ground measurements are usually more precise.