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Clark's Rule Calculator

Result

Calculated result 0.1466666667 Based on the values entered.
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Clark's Rule Calculator — free online calculator.

Formula

Child dose = adult dose × (weight in lb / 150)
  • Clark's Rule Calculator calculates its result from Adult Dose, Weight In Lb. It uses the formula Child dose = adult dose × (weight in lb / 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, Weight In Lb. 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: Clark's Rule

Inputs
  • Adult Dose: 2
  • Weight In Lb: 11

Using Adult Dose = 2, Weight In Lb = 11, the calculated result is 0.1466666667.

Sample result: Calculating…

Frequently asked questions

What does the Clark's Rule calculate?

Clark's Rule Calculator — free online calculator.

Which values should I enter?

Enter Adult Dose, Weight In Lb using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Child dose = adult dose × (weight in lb / 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