I've had several customers request nutritional analyses on my bakery goods. So I analyzed my Toffee biscotti recipe using my nutrition software. If you are interested go to the Toffee biscotti post.
It wasn't as easy as it should have been, but I'm fairly confident that it is a good approximation. I would have analyzed all my recipes already if not for several obstacles:
1. my items are handmade so the portions aren't exact
2. the bread doesn't come pre-sliced
3. my analysis software does not contain all my specialty ingredients in its database
4. I am not required by law to have nutritional information b/c I am a "mom & pop" operation, to have real nutrition info I would need to have my food sent off and physically tested
All that said I'm glad to provide some information. On my biscotti I have listed the information for a serving size of 1 large biscotti (or sometimes 2 small) equal to 1/12 the recipe size. And when I get the bread analyzed I will list the numbers for a portion of the bread- your slices may be bigger or smaller than mine. But hopefully my analysis will be helpful.