# 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.