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(T4) Equivalent
1/4 grain
9.5 mcg T4
2.25 mcg T3 18.5 - 25 mcg
1/2 grain
19 mcg T4
4.5 mcg T3 37 - 50 mcg
1 grain
38 mcg T4
9 mcg T3 74 - 100 mcg
1 1/2 grain
57 mcg T4
13.5 mcg T3 111 - 150 mcg
2 grain
76 mcg T4
18 mcg T3 148 - 200 mcg
3 grain (bisected)
114 mcg T4
27 mcg T3 222 - 300 mcg
4 grain
152 mcg T4
36 mcg T3 296 - 400 mcg
5 grain (bisected)
190 mcg T4
45 mcg T3 370 - 500 mcg