About Creating a Calculation

You can use operators and functions to calculate a new value based on existing property values. You can use the resulting value to filter or select data. For example, you can calculate the area of parcels and then select parcels whose areas are above a certain area value.

Note: In AutoCAD Map 3D, you can store the resulting calculation as a new property in the Data Table. The calculated property is stored with the map, but is not written back to the original data store. To save the property to a data store, export the layer to an SDF file or Bulk Copy the feature class to another data store.

The syntax for calculations varies, depending on whether you use operators or functions.

Note: Connect to the data store that contains the data for the calculation to create or manage calculations.

Note: For some calculations, values do not update automatically because the data providers do not support their underlying functions. Instead, the values display as read-only properties. If you do not see a new calculated value immediately, refresh the layer manually. In AutoCAD Map 3D, right-click the layer in Display Manager and click Refresh Layer.

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Procedures	To perform a calculation using an operator To perform a calculation using a function To find area or length To create a calculated property
Related topics	About Calculated Properties Using Expressions to Filter Feature Data Geometric Options Creating Expressions for Queries Creating Expressions - Reference

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Videos	Show me how to create a calculated field.
Tutorials	Exercise 5: Create a calculated property