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Vitamin D Status Calculator

Work out vitamin d status instantly with clear inputs, formula shown and shareable results.

About Vitamin D Status Calculator

Converts a 25-hydroxyvitamin D result between ng/mL and nmol/L and applies the Endocrine Society status categories.

Formula

Vitamin D status

nmol/L = ng/mL x 2.496. Deficiency under 20 ng/mL (50 nmol/L), insufficiency 20-29, sufficiency 30-100 ng/mL

Worked example

With the default values below, Vitamin D Status Calculator returns Status category of Insufficiency (20 to 29 ng/mL). Change any input above and every figure here is recalculated in your browser.

Inputs used

25-hydroxyvitamin D levelaccepts 1–200
22
Unitsone of ng/mL, nmol/L
ng/mL

Results

Status category
Insufficiency (20 to 29 ng/mL)
Level
22.0 ng/mL
Level
54.9 nmol/L
Gap to 30 ng/mL
8.0 ng/mL

Step by step

  1. 1Values used
  2. 2Vitamin D status
  3. 3Status category= Insufficiency (20 to 29 ng/mL)
  4. 4Level= 22.0 ng/mL
  5. 5Level= 54.9 nmol/L
  6. 6Gap to 30 ng/mL= 8.0 ng/mL

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Do guidelines agree on the thresholds?

No. The Institute of Medicine treats 20 ng/mL as sufficient, while the Endocrine Society prefers 30 ng/mL.

Which test is correct?

Total 25-hydroxyvitamin D; 1,25-dihydroxyvitamin D does not reflect stores.

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