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Manage measurement scales
Last updated on
Oct 27, 2025
Learn more about setting a measurement scale, creating presets for frequently used scales, and deleting presets in Photoshop.
Set measurement scale
Select Image > Analysis > Set Measurement Scale > Custom. The Ruler tool is automatically selected.
Enter a value in the Pixel Length text box.
Enter the Logical Length and Logical Units to set equal to the Pixel Length.
Example: If the Pixel Length is 50 and you want a scale of 50 pixels per micron, enter 1 for Logical Length and type microns as the unit.
Select OK in the Measurement Scale dialog box to apply the scale to image.
Select File > Save to save the measurement scale setting with the document.
Create a measurement scale preset
Open an image.
Select Image > Analysis > Set Measurement Scale > Custom.
Define a measurement scale.
Select Save Preset and enter a name for the preset.
Select OK. The new preset is added to Image > Analysis > Set Measurement Scale submenu.
Delete a measurement scale preset
Select Image > Analysis > Set Measurement Scale > Custom.
From the list of presets, select the one you want to delete.
Select Delete Preset and then select OK.
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