I think that this may be what you are looking for
All this tools are very nice but achilles' heel of frequency calculation is the compliance value. Some manufactures are publishing C values @100 Hz which is useless. Look at this thread, there is a nice calculator which can be used at 100 Hz.
Moving on to another question. With an Ortofon arm, the other thing to consider, has to be an Ortofon SPU cartridge. Any views on these and which in the line up seems the sweet spot?
I do note they are heavy and tend to have a recomended tracking weight of 3gm, which may suggest some more vinyl wear