Lawn Size Calculator

To measure your lawn or yard by address, enter it in the tool above. The map jumps to a satellite view of your property, so you can see exactly how big your yard is from overhead. Tap the corners of your lawn to trace its outline, and the square footage is calculated automatically as you go.

It works for the front yard, the backyard, or the whole property. Draw each turf area separately if they are disconnected, and the tool adds them up. This is the fastest way to answer "how big is my lawn?" without measuring anything by hand, and the number is accurate enough to buy fertilizer, seed, and sod against.

Drop a pin at your address, zoom in until the lawn fills most of the screen, and trace the boundary by clicking corners. The tool computes the area of the resulting polygon with standard geodesic area math over georeferenced imagery, the same approach mapping and GIS tools use.

Under good conditions the result lands within a few percent of a tape-measured value, close enough for fertilizer rates, seed-bag math, sod orders, and irrigation zones. The two things that hurt accuracy are tree canopy hiding turf edges and very small lawns under 500 sq ft, where one pixel of error matters more.

To calculate lawn square footage by hand, measure the length and width of the area in feet and multiply them. A lawn that is 80 feet long and 100 feet wide is 80 × 100 = 8,000 square feet. That is the same number the map gives you, just measured with a tape instead of satellite imagery.

Real lawns are rarely one clean rectangle, so split the yard into rectangles you can measure, work out each one, and add them together. A front yard of 40 × 60 (2,400 sq ft) plus a backyard of 50 × 90 (4,500 sq ft) is 6,900 square feet total. Curved or triangular sections can be approximated as rectangles, or typed into the Enter Dimensions tab, which adds multiple areas for you.

To convert square feet to acres, divide by 43,560. A 10,890 square foot lawn is 10,890 ÷ 43,560 = 0.25 acres. Most residential lawns land between a tenth and a third of an acre, so if your number comes out much larger, double check that you did not include the house, driveway, or beds. The area toggle on this tool switches between square feet, acres, and square meters automatically once you have a measurement.

Census Bureau housing data puts the median lot for a newly built single-family home at roughly 8,200 to 8,900 square feet, about a fifth of an acre, and new lots have been shrinking for three decades. Across all existing single-family homes the commonly cited median is closer to 10,900 square feet, a quarter acre. The lawn itself is smaller than the lot: subtract the house footprint, driveway, patio, and beds, and most properties end up with 30 to 60 percent less turf than the deed suggests.

Region moves the number more than anything else. New England lots run around three times the national median, while dense urban lots often leave under 5,000 square feet of yard. Add it all up nationwide and researchers estimate about 40 million acres of lawn in the lower 48, which is why NASA once called turf grass America's largest irrigated crop.

For lawns over 1000 sq ft, satellite measurement is faster, more accurate, and lets you remeasure later without re-walking the property. The polygon approach handles irregular shapes (curved beds, kidney-shaped backyards) that a tape measure has to approximate as rectangles.

For tiny urban lots under 500 sq ft, a tape measure is competitive — pixel-level error matters when every square foot is 0.2% of the total. For everything in between, the satellite tool is the right default.