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Fried's Rule Calculator

months

Result

Calculated result 0 Based on the values entered.
↗ Health

Fried's Rule Calculator Fried's Rule is a pediatric dosing formula to calculate safe medication doses for infants (under 1 year). Enter the adult dose and infant age in months to estimate the appropriate infant dose. — free online calculator.

Formula

Fried arithmetic = adult dose × infant age in months ÷ 150.
  • Fried's Rule Calculator calculates its result from Adult dose from prescription/reference, Infant age (months). It uses the formula Fried arithmetic = adult dose × infant age in months ÷ 150.. Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
  • The main inputs are Adult dose from prescription/reference, Infant age. Enter them in the units and format shown in the calculator.
  • Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Fried's Rule

Inputs
  • Adult dose from prescription/reference: 0
  • Infant age: 6 months

Using Adult dose from prescription/reference = 0, Infant age (months) = 6, the calculated result is 0.

Sample result: Calculating…

Frequently asked questions

What does the Fried's Rule calculate?

Fried's Rule Calculator Fried's Rule is a pediatric dosing formula to calculate safe medication doses for infants (under 1 year). Enter the adult dose and infant age in months to estimate the appropriate infant dose. — free online calculator.

Which values should I enter?

Enter Adult dose from prescription/reference, Infant age using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Fried arithmetic = adult dose × infant age in months ÷ 150..

Why might my result differ from another source?

Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026