Calculate Polygon Area in QGIS

How to Calculate Area of Polygon in QGIS

Updated on:

June 8, 2026

By:

Use this interactive demo to learn how to measure polygon areas directly in QGIS using the Processing Toolbox.

Quick summary

In QGIS, you can calculate the area of any polygon layer using the built-in Add Geometry Attributes tool in the Processing Toolbox, which appends area values directly to the layer's attribute table without any manual formulas. Once the tool runs, the computed area values are immediately available in the Attribute Table for use in analysis, reporting, or export.

Steps

Open the Processing Toolbox from the right-side menu in QGIS.
Use the search bar to find and select Add Geometry Attributes.
In the Input Layer dropdown, choose your target polygon layer (e.g., barangays, parcels, or land use).
Click Run to execute the tool and generate the output layer.
Right-click the newly added layer in the Layers panel and select Open Attribute Table.
Confirm that the area values are already calculated and available for use in the attribute table.

📌 Why this matters

Calculating polygon area in QGIS is a fundamental GIS task required for land use planning, environmental assessment, cadastral mapping, and spatial analysis. QGIS's Processing Toolbox makes this accessible to any user without coding — the Add Geometry Attributes tool automatically appends accurate area measurements to any vector polygon layer in seconds. This saves significant time compared to manual measurement and ensures consistency across large datasets such as barangay boundaries, land parcels, or administrative zones. For GIS professionals and analysts, mastering this workflow is essential for producing reliable, data-driven geographic reports.

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