Adobe PhotoShop - Use Free Transform To Resize An Image With Specific Dimensions (Photoshop 7/CS)
You can resize your selections to an exact measurement using the Free Transform function. Just select the area you want resized. Then, press [command]T ([Ctrl]T in Windows) to access the Free Transform function. Next, go to the tool options bar and enter the appropriate measurements in the W (width) and H (height) text boxes, making sure to follow up the value with inches, pixels, etc. Then, press [enter] to apply your changes.