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In image menu select image size or click
Ctrl + Alt + i and change pixels
Choose Image > Image Size.
Do any of the following to modify the image preview:
To change the unit of measurement for the pixel dimension, click the triangle next to Dimensions and choose from the menu.
To maintain the original ratio of width to height measurement, make sure that the Constrain Proportions option is enabled. If you want to scale the width and height independently of each other, click the Constrain Proportions icon to unlink them.
Note:
You can change the unit of measurement for width and height by choosing from the menus to the right of the Width and Height text boxes.
Do any of the following:
(Optional) From the Fit To menu:
Enter values for Width and Height. To enter values in a different unit of measurement, choose from the menus next to the Width and Height text boxes.
The new image file size appears at the top of the Image Size dialog box, with the old file size in parentheses.
To change the Resolution, enter a new value. (Optional) You can also choose a different unit of measurement.
If your image has layers with styles applied to them, select Scale Styles from the gear icon to scale the effects in the resized image. This option is available only if you selected the Constrain Proportions option.
When you finish setting options, do any of the following:
To restore the initial values displayed in the Image Size dialog box, either choose Original Size from the Fit To menu, or hold down Alt (Windows) or Option (Mac OS), and click Reset.