If I have nf1 what is the chance that I will have a child with nf1?

Neurofibromatosis. If you mean neurofibromatosis1, there is a 50% likelihood of the child inheriting the defective gene and the disease. It is an autosomal dominant disorder.
Fifty % for each. If this is really NF1, each child has a 50% chance of inheriting it. Talk with your physicians about options for preimplantation testing, and what other options may be available to you.
NF1?? Please be more specific about nf1. I cannot help you with something if I do not understand the question. I do not know this abbreviation nf1.