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Fluoride Dose Calculator

Work out fluoride dose instantly with clear inputs, formula shown and shareable results.

About Fluoride Dose Calculator

Applies the ADA fluoride supplementation schedule by age and water fluoride concentration, and shows the probably toxic dose of 5 mg F per kilogram.

Formula

ADA supplementation schedule

Under 6 months: none. 6 months to 3 years: 0.25 mg if water under 0.3 ppm. 3 to 6 years: 0.5 mg under 0.3 ppm, 0.25 mg at 0.3-0.6 ppm. 6 to 16 years: 1 mg under 0.3 ppm, 0.5 mg at 0.3-0.6 ppm

Worked example

With the default values below, Fluoride Dose Calculator returns Daily fluoride supplement of 0.50. Change any input above and every figure here is recalculated in your browser.

Inputs used

Ageaccepts 1–216 months
36 months
Fluoride in drinking wateraccepts 0–2 ppm
0.2 ppm
Body weightaccepts 3–90 kg
14 kg

Results

Daily fluoride supplement
0.50 mg F
Schedule note
Supplement indicated by the ADA schedule
Probably toxic dose for this weight
70 mg F
Water fluoride band
Under 0.3 ppm

Step by step

  1. 1Values used
  2. 2ADA supplementation schedule
  3. 3Daily fluoride supplement= 0.50 mg F
  4. 4Schedule note= Supplement indicated by the ADA schedule
  5. 5Probably toxic dose for this weight= 70 mg F
  6. 6Water fluoride band= Under 0.3 ppm

Assumptions and limits

  • The result is derived only from the 3 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 2 decimal places, 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.

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

Why is water fluoride needed?

Supplementation is only appropriate where water fluoride is low, otherwise fluorosis risk rises.

What is the probably toxic dose?

5 mg of fluoride per kilogram body weight, the level at which emergency assessment is advised.

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