How accurate is the map area calculator?

The calculator uses Google Maps' geodesic area computation, which accounts for the curvature of the Earth. For typical land parcels, accuracy is within 0.1-0.5% of the true area. Accuracy depends on how precisely you place the boundary points.

Can I measure irregularly shaped fields?

Yes. You can place as many boundary points as needed to trace complex, irregular shapes. The more points you use along curves and corners, the more accurate your measurement will be.

What units are supported?

Area can be displayed in square meters (m²), square feet (ft²), acres (ac), and hectares (ha). Perimeter is available in meters, feet, kilometers, and miles. You can switch units at any time.

Can I adjust the boundary after measuring?

Yes. After closing the polygon, you can drag any vertex to adjust the boundary. The area and perimeter recalculate in real time as you move points.

Are my measurements saved?

Yes. Your drawn polygon and unit preferences are saved in your browser's local storage. When you return to the page, your last measurement will be restored automatically.

Free Map Area Calculator - Measure Land Area on a Map

About Field Area Measurement

Measuring land area accurately is essential for farmers, property owners, surveyors, landscapers, and real estate professionals. This free map area calculator lets you draw directly on a satellite map to measure any field, lot, or property boundary — no special equipment or software needed.

The tool uses geodesic calculations that account for the curvature of the Earth, providing highly accurate results for areas of any size — from a small garden to a large farm.

How It Works

Navigate to your land

Use the satellite view to find your field. The map will try to center on your current location automatically.

Draw the boundary

Click around the edges of the area you want to measure. Each click adds a point to your polygon outline.

Close and measure

Click the first point again or press "Close & Measure" to complete the polygon. Area and perimeter appear instantly.

Fine-tune

Drag any vertex to adjust the boundary. Measurements update in real time. Switch units with the dropdown.

Common Use Cases

✓ Farming & Agriculture — Measure crop fields, paddocks, and grazing areas for planning and record-keeping
✓ Real Estate — Quickly estimate lot sizes when evaluating properties for purchase or sale
✓ Landscaping — Calculate lawn, garden, or patio areas for materials estimation
✓ Construction — Measure building sites and plot boundaries for project planning
✓ Environmental Studies — Map forest plots, wetlands, or conservation areas
✓ Property Disputes — Get a quick independent measurement of boundary areas

Accuracy Information

This tool uses the Google Maps Geometry library's computeArea() function, which calculates geodesic area accounting for the Earth's curvature. For most land parcels, expect accuracy within 0.1–0.5% of the true area.

Precision depends primarily on how carefully you place boundary points. For the best results, zoom in closely and place points at each corner and along curved boundaries. The satellite imagery helps you align points precisely with visible property lines, fences, tree lines, or other landmarks.

Free Map Area Calculator