Levothyroxine Dosage Calculator
Health & FitnessEstimate a weight-based starting levothyroxine dose using standard endocrinology replacement rates for full and subclinical hypothyroidism.
Suggested Starting Dose
The suggested starting daily dose. A conservative flat starting dose is used for cardiac disease or older adults, titrated up gradually.
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Frequently Asked Questions
How is the dose adjusted after starting?
TSH is typically rechecked 6 to 8 weeks after starting or changing the dose, and the dose adjusted based on the result.
Why is a lower starting dose used for older adults or heart disease?
Starting too high can strain the heart, so a conservative starting dose (commonly 25 mcg) is titrated up slowly instead.
Is this a substitute for medical advice?
This tool is for educational reference only and is not a substitute for professional medical advice. Always confirm dosing with a doctor or pharmacist before giving or taking any medication.
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