Need the right RT3 Ratio Calulation

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I have seen numerous posts on calculating the RT3 ratio and I need help

determining the right one. Both results are pg/ml so do I multiply by

1000? Another site says to multiply by 100? So confused. FT3 3.5

(2.0-4.4 pg/ml) RT3 205 (90-350 pg/ml). My Ft4 dropped a while back and

has not come back up too easily even with a lower than ever TSH. FT4

1.14 (.71-1.85) and TSH .838 (.27-4.2). I still feel very crummy and

was going to ask the Dr to switch me to NTH over the Synthroid after all

the reading and research I have done, I think I am ready for the switch

but want to rule in or out this RT3 thing. Thank you!