# Real size
In order for the module to calculate the design cost, it need to know the product real size
in centimeters.
You can determine this real size by resizing the ruler and entering the size in cm.
You can also define a real size for each combination image if your product has different images
You can also define a different size for each side of the product.
TIP
If no real size is defined for an image, the real size of the default image will be used.