Levothyroxine Dose Calculator
Estimate a weight-based starting levothyroxine dose for hypothyroidism — for educational reference only, not medical advice.
Patient Details
For educational reference only — not a substitute for medical advice.
Enter patient details and click
Calculate Dose
Estimated Starting Dose
Daily Dose Range
— mcg/day
Practical Tablet Starting Strength
Nearest available commercial tablet strength (rounded to 25 mcg)
Weight used
Dose factor
Educational use only. This estimate is based on weight-based dosing guidelines and does not replace a clinical evaluation. TSH must be measured 6–8 weeks after initiating therapy. Consult your physician before starting or changing any medication.
Summary
Estimate a weight-based starting levothyroxine dose for hypothyroidism — for educational reference only, not medical advice.
How it works
- Enter your body weight and select kilograms or pounds.
- Choose your clinical condition from the dropdown (e.g., primary hypothyroidism, elderly patient, cardiac disease).
- Click "Calculate Dose" to see the estimated starting dose range.
- Review the educational notes about titration and monitoring.
- Share the result with your physician — never self-prescribe based on this estimate.
Use cases
- Quickly cross-check a physician-prescribed starting dose against published weight-based guidelines.
- Educate patients about why dose varies by weight and health status.
- Help pharmacy students and nurses understand dosing principles for hypothyroidism.
- Support clinical educators teaching thyroid hormone replacement concepts.
- Estimate dose adjustments when body weight changes significantly.
- Compare full-replacement vs. conservative dosing for different patient profiles.
Frequently Asked Questions
Last updated: 2026-07-01 ·
Reviewed by Nham Vu