For U.S. shipping what Canada Post service have you specified that you are using? You must separate the U.S. from other countries as they have different services. For example, you would use Small Packet USA to the U.S. and Small Packet International to other countries. The calculator won't tell a buyer how much tracked packet international costs in the U.S. because there is no such service for the U.S. You would have to used Tracked Packet USA. TP international does go only to specific countries so if you are shipping worldwide you would have to specify another service for some countries.
Also, if you are using Canada Post Expedited to the U.S. the minimum measurements are different than the min. measurements for Expedited within Canada and if your measurements are too small for that service then the calculator won't work.
I suggest that for less expensive items you don't use a tracked service as most buyers are not willing to pay more for shipping an item than the actual cost of the item. Instead of charging $43 shipping for a $13 book to the UK you could used small packet international for around $10.
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