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Calcimator

Vitamin D Dosing Calculator

Calculate daily vitamin D (IU) needed to reach your target serum level based on current level, weight, and sun exposure.

Inputs

Results

Daily Dose

3,100 IU

Maintenance Dose

1,200 IU

Weekly Dose21,700 IU
Months to Target1 months
How to Use This Calculator
  1. Enter your most recent serum 25(OH)D level in ng/mL from a blood test.
  2. Set your target vitamin D level (optimal range is typically 40-60 ng/mL).
  3. Input your body weight and skin tone as both affect synthesis and distribution.
  4. Review the Recommended Daily IU dose to reach your target and the Estimated Weeks to Target.
  5. Note that vitamin D is fat-soluble - take with a meal containing healthy fats for best absorption.
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