Senefelder.co.uk offers the following tools for publishers:

Calculate thickness
For the correct processing of a threadless (unsewn) bound product, the cover must be equipped with a ‘spine’. Our calculating tool provides a simple method for determining the spine width of your threadless bound issue.

Calculate postal weight
Looking for a simple way to determine the postal weight of your issue? Use our calculating tool. This rapidly gives you insight into the weight of your issue.