Sam,
They do not correlate at least not, if you do not also take into account the paper grade.
ISO Film Speed is defined as ISO = 0.8lxs / Hm, while Hm is the amount of light (in lxs) necessary for a density of 0.1logD above base.
ISO Paper Speed is defined as ISP-P = 1000lx / Hp, whereas Hp is the amount of light (in lxs) necessary to gain a paper density of 0.6logD.

I would recommend buying a lab meter.