If you want to make a cover template for your CD cases, you can download templates from the Internet. You can also do the job for free using the standard Microsoft Paint software on your computer, or even design a cover template by hand with the right measurements. You can make your CD stand out with your own designs, but to make the cover fit the CD case you must have the right dimensions.
Pen and paper method
Measure the dimensions for the CD cover using a ruler with a right angle. This will make it completely square. The dimensions for a CD cover for a regular CD case (not a slim case) are 15 x 11.8 cm (5.906 x 4.646 inches). You can estimate for bleed, which will help your graphics blend into the folded edges, by scaling the measurements up by 3 mm (1/8 inch).
Draw the back cover with your right-angled ruler. The dimensions for the back cover of your CD case are 11.9 x 11.9 cm (4.724 x 4.724 inches). You can round this measurement up to make the job easier with a ruler.
Add your artwork to the CD cover and back. The folds on the front cover are 6 mm (1/4 inch), so keep that in mind while you are designing your cover.
Copy your cover for multiple CD covers or cut out and insert the one you created for a one-of-a-kind CD cover.
Open your design software and go to the menu that lets you resize the image. Size the front cover image and mark out the folds, using the same dimensions as in the first section. Save the document.
Open a new file. As with the previous step, resize the image so that it measures the correct dimensions for the back cover.
Add your artwork to the front and back covers of the CD case. Save both files frequently as you work. Keep in mind the folds of the front cover as you design it.
Print the cover and cut it out, or duplicate it for multiple CD case covers.