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Levothyroxine Dosage Calculator
Calculate estimated Levothyroxine (Synthroid) replacement dose
Endocrinology Guidelines: Full replacement dose for primary hypothyroidism is typically calculated as 1.6 mcg/kg/day. For older adults or patients with known coronary artery disease, guidelines recommend starting at a lower conservative dose (25–50 mcg daily). Enter patient parameters below.
Patient Parameters Input
Calculation Results
⚠️ Not medical advice. For endocrinology, clinical pharmacology, and reference only. Thyroid hormone replacement therapy, initial dosing, and subsequent TSH level monitoring must be prescribed and supervised strictly by a qualified physician or endocrinologist.