My view is a bit biased as I am a sort of pilot-engineer mix with a foot firmly in both camps. However, one of Tech Log's strengths is its ability to act as a training facilitation vehicle and the mods revel in this sort of thread.
Generally the pilot is not called on to calculate DOI but there is no reason why you should not be able to do so .. in any case, knowledge is generally a useful thing in its own right ...