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Home and Garden Calculator

Land Area Calculator

Draw any yard, garden bed, lawn, or plot directly on a satellite map to get an accurate area measurement. Results are shown in square feet, square yards, acres, and square meters — ready to plug into your next material calculator.

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Tap or click "Add area" then place points on the map. Double-tap or double-click the first point to close the shape.

Search for your address above, then click Add area and trace your plot on the map. Add as many areas as you need, then click Calculate to see your total.

Use this area in another calculator

Once you know your square footage, plug it straight into one of these material calculators to figure out how much to order.

How We Calculate

Formula, assumptions, and sources

Inputs you provide

  • Polygon vertices — the points you click on the map to trace an area. The calculator uses the latitude/longitude of each vertex; nothing is measured by pixel counting.

Formula

Each vertex's latitude/longitude is projected to planar (x, y) coordinates using an equirectangular projection centered on the polygon. Then the area of the resulting polygon is computed using the Shoelace formula (surveyor's formula):

A = ½ × |Σ(xi·yi+1 − xi+1·yi)|

The resulting area (in square meters) is then converted to square feet, square yards, acres, and hectares for display. Multiple separate polygons are summed.

Assumptions

  • 1° of latitude = 111,320 meters (spherical Earth approximation). Longitude scales by the cosine of latitude to account for meridians converging near the poles.
  • The equirectangular projection treats small areas as flat — a reasonable approximation for plots up to a few acres, where Earth's curvature introduces negligible error.
  • Standard conversions: 1 m² = 10.7639 sq ft; 1 acre = 43,560 sq ft; 1 hectare = 10,000 m².

Sources

Limitations

  • Accuracy depends on how carefully you trace the boundary. For typical yard sizes (under an acre), the math is accurate to well under 1%; human tracing error is usually the dominant source of variance.
  • Equirectangular projection error grows with area and latitude. For plots under a few acres at typical US latitudes, the error is under 1%. For large parcels (tens of acres or more), use a UTM-projected GIS tool for legal or financial decisions.
  • Satellite imagery in the map tiles is a visual reference, not a survey. Property lines, easements, and setbacks are not shown and cannot be measured from the image. For legal boundary, closing, or construction-permit work, a licensed land surveyor is the right source.

Frequently Asked Questions

How accurate is this land area calculator?

For typical yard and garden sizes the calculator is accurate to within about 1%. It uses an equirectangular projection with the Shoelace formula — which is highly accurate for plots spanning a few acres or less. For very large land parcels (tens of acres), consider a professional survey for legal or financial decisions.

How do I measure an irregular yard shape?

Search for your address to jump to your property on the satellite view, then click Add area. Click along the boundary of your yard to place points, following the edges as closely as you can. Double-click (or click the first point) to close the shape. You can drag any vertex afterward to fine-tune.

How do I measure a yard that has a house or driveway in it?

Just trace the areas you actually want to measure — usually the grass or planting beds — and skip over the house, driveway, or patio. You can click Add area as many times as you like to outline each separate section of lawn or garden. The breakdown panel shows every area you added, and the total is the sum of all of them.

How many square feet are in an acre?

One acre equals exactly 43,560 square feet. An average suburban lot is roughly 0.2–0.25 acres (about 8,700–10,900 sq ft). A standard American football field (including end zones) is about 1.32 acres.

What is a square yard and when should I use it?

A square yard is 9 square feet (3 ft × 3 ft). Landscaping materials like mulch, topsoil, and gravel are often sold by the cubic yard, so knowing your area in square yards alongside your desired depth makes it easy to calculate volume without extra conversion steps.

Does this work on mobile?

Yes. The map uses single-finger panning and drawing so your finger doesn't get “trapped” scrolling the page. Tap Add area, then tap points around your yard boundary. Pinch to zoom in for better accuracy. Double-tap the final point (or tap the starting point) to close the shape.

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