Thyroid Dose Calculator

Levothyroxine dose from TSH and body weight.

Medical Disclaimer

This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.

Inputs

Body Weight (kg)

TSH (mIU/L)

Free T4 (ng/dL)

Patient Type (0=Young, 1=Elderly/Cardiac)

Tab to move between fields

Results

Calculated Dose (µg/day)

112

Nearest Tablet (µg)112

Recommended Starting Dose (µg)112

Dose Adjustment (µg)18.75

TSH Status (0–3)2

Free T4 Status (0–2)1

How to Use This Calculator

Enter Body Weight (kg), TSH (mIU/L), and Free T4 (ng/dL).
Select Patient Type (Young healthy adult or Elderly/Cardiac) — cardiac patients start at a lower dose.
Review Calculated Dose (ug/day) and the Nearest Available Tablet strength.
Check Recommended Starting Dose — initiate at 25-50 ug/day in elderly or cardiac patients.
Note TSH Status and Free T4 Status to guide dose adjustment at the 6-8 week recheck.

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