No - a close look in your OM part A ch. 8 should produce words to the effect that "...the observed visibility may be converted...".
The only time you can use converted visibility is:
a) No RVR measurement available and either
b) CAT I ILS, or
c) Straight-in NPA
That means that you cannot convert during the planning stage, to detemine if RVR required for TO exists, during CAT II/III ops and (for obvious reasons) for circling approaches.
Brgds,
Empty