Field Calculator for QGIS

Quickly perform attribute calculations within QGIS using our free online tool, designed for GIS professionals and students needing efficient data processing.

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Total Calculations Run

< 15ms

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100%

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About This Tool

The Field Calculator for QGIS is an intuitive, web-based tool that allows users to create or update attribute data directly within their GIS projects. Simply select the target layer, choose an attribute field, and input your custom calculation formula. The tool provides real-time previews, validation, and supports batch processing for large datasets. Whether you're calculating areas, densities, or complex expressions, this tool helps streamline spatial data analysis. It is ideal for geospatial analysts, urban planners, environmental scientists, and students working on GIS projects. With support for exporting results in formats like CSV or GeoJSON, users can seamlessly integrate calculated data into other workflows or further GIS processing. Designed with modern UX principles, it offers a responsive, accessible interface, ensuring maximum usability across devices and for users with varying accessibility needs.

Save your calculation history with a free account

How to Use

Select your target layer from the dropdown.
Choose the attribute field to calculate.
Enter your calculation expression, e.g., "area / population".
Specify the output field name and type.
Preview the results to verify accuracy.
Click 'Apply' to update the layer, or export the data for external use.

Frequently Asked Questions

Find Quick Answers

Can I update multiple attributes at once?

Yes, you can define formulas for multiple fields by repeating the process or using batch templates and exporting the results for multiple updates.

Does it support advanced functions like trigonometry or GIS-specific functions?

Yes, the formula editor supports common mathematical functions, GIS functions, and allows custom expressions for complex calculations.

Is there a limit on dataset size?

Performance depends on your browser and system resources, but the tool handles typical GIS attribute tables efficiently. For very large datasets, consider processing in batches.

Can I save calculation formulas for later use?

Yes, the tool allows saving templates for quick reuse in future GIS projects.

Does it work offline?

No, this is a web-based online tool requiring an internet connection to function.

Need to run multiple calculations?

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