Thyroid Equivalency Chart
        ~ for figuring your T3

        Here is a helpful chart that was once posted on the thyroid list, that was prepared by Leslie Blumenberg. I hope it helps in figuring your T3.

        Products with 80% T4 and 20% T3

         

        Bio-Tech Thyroid (all in mcg)
        1/4 grain  2.3 T3   +  9.3 T4  = T4 equivalency of 18.5 mcg 
        1/2 grain  4.6 T3  + 18.6 T4  = T4 equivalency of 37 mcg 
        1 grain  9.2 T3   + 37.1 T4  = T4 equivalency of 73.9 mcg 
        1-1/2 grains 13.9 T3  + 56.4 T4  = T4 equivalency of 112 mcg
        2 grains 16.8 T3  + 68.4 T4  = T4 equivalency of 135.6 mcg
        3 grains 27.8 T3  + 111.4 T4  = T4 equivalency of 222.6 mcg
        4 grains 36 T3  + 144.5 T4   = T4 equivalency of 288.5 mcg

         

        Thyrolar: (all in mcg)
        1/4 grain 3.1 T3  + 12.5 T4   = T4 equivalency of 24.9 mcg
        1/2 grain 6.25 T3  + 25 T4  = T4 equivalency of 50 mcg
        3/4 grain 9.375 T3  + 37.5 T4   = T4 equivalency of 75 mcg
        1 grain 12.5 T3  + 50 T4   = T4 equivalency of 100 mcg
        1 1/2 grains 18.75 T3   + 75 T4   = T4 equivalency of 150 mcg
        1 3/4 grains 21.88 T3  + 88 T4   = T4 equivalency of 175.52 mcg
        2 grains 25 T3   + 100 T4   = T4 equivalency of 200 mcg

         

        Armour: (all in mcg)
        1/4 grain 15mg  =  2.25 T3 / 9.5 T4   = T4 equivalency of 18.5 mcg
        1/2 grain 30mg  =  4.5 T3  / 19 T4  = T4 equivalency of 37 mcg
        3/4 grain 45mg  =  6.75 T3 + 28.5 T4   = T4 equivalency of 55.5 mcg
        1 grain 60mg  =  9 T3 + 38 T4   = T4 equivalency of 74 mcg
        1 1/2 grains 90mg  =  13.5 T3 + 57 T4   = T4 equivalency of 111 mcg
        2 grains 120mg  =  18 T3 = 76 T4   = T4 equivalency of 148 mcg

        In order to change the T4/T3 ratio in the above products, a small amount
         of T4 med could be added to shift the ratio from 80/20 to 90/10

         

        T4 only plus T3 only meds (eg. Unithroid, Synthroid plus Cytomel) 
        with 90% T4 and 10% T3
        25mcg of T4  + 2.5mcg of T3   =   T4 equivalency of 35mcg
        50mcg of T4  + 5mcg of T3   =   T4 equivalency of 70mcg
        75mcg of T4  + 7.5mcg of T3   =   T4 equivalency of 105mcg
        100mcg of T4  + 10mcg of T3   =   T4 equivalency of 140mcg
        112mcg of T4  + 11.2mcg of T3  =   T4 equivalency of 156.8mcg
        125mcg of T4  + 12.5mcg of T3  =   T4 equivalency of 175mcg
        137mcg of T4  + 13.7mcg of T3   =   T4 equivalency of 191.8mcg 
        150mcg of T4  + 15mcg of T3   =   T4 equivalency of 210mcg
        175mcg of T4  + 17.5mcg of T3   =   T4 equivalency of 245mcg
        200mcg of T4  + 20mcg of T3   =   T4 equivalency of 280mcg