Our software reliability prediction toolkit uses key practices from DO-178B as inputs.   So, if you have had an assessment for DO-178B, you will be able to predict software reliability based on those assessment results.  Our training and Frestimate software also addresses DO-178B.

Below is a screenshot from the Frestimate Full-Scale Model Survey Inputs page.   You can see that each Full-scale survey question is cross referenced to standards such as DO-178B.