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Problem: The Measure tool is disabled in ArcMap

Description

When accessing the Tools toolbar in ArcMap, the Measure tool is disabled (grayed out).

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Cause

This issue occurs because the map does not have known units.

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Solution or Workaround

Set the map unit of the data frame

Set the map unit of the data frame with a known unit such as Meters or Miles.

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Note:
The map units are determined by the data frame's coordinate system.
 

Specify a coordinate system

1. Specify a coordinate system for the data frame.

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2. After the coordinate system of the data frame is specified, the map unit is also set with a known unit.

Note:
The data frame's coordinate system is usually determined by the first layer added to the map. Apply a projected coordinate system (PCS) to measure areas. For more information on changing and assigning a coordinate system, refer to Specifying a coordinate system.

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