Pediatric Dosing Calculator
Calculate age- and weight-adjusted medication doses for children using Young's, Clark's, and Fried's rules.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
AAP: weight-based dosing standard; typical pediatric weights: 6 mo 7 kg; 1 yr 10 kg; 5 yr 18 kg; 10 yr 32 kg
Results
Young's Rule Dose
166.7mg
Clark's Rule Dose
142.9mg
How to Use This Calculator
- Enter child weight (kg) and age (years/months).
- Select the medication and review weight-based and age-based dose recommendations.
- Always verify with current Harriet Lane or BNFc guidelines — this tool is for reference only.
How the result changes with Adult Dose
| Adult Dose | Young's Rule Dose | Clark's Rule Dose |
|---|---|---|
| 501 | 167mg | 143.1mg |
| 1,751 | 583.7mg | 500.3mg |
| 3,250 | 1,083.3mg | 928.6mg |
| 4,500 | 1,500mg | 1,285.7mg |
What each input means
- Child's Age
- Age of the child in years. Use decimals for months (e.g., 0.5 = 6 months).
- Child's Weight
- Child's body weight in kilograms. Weight-based dosing (mg/kg) is standard for pediatrics per FDA pediatric labeling and AAP guidelines. Always verify calculated dose against maximum adult dose and product labeling.
- Adult Dose
- Standard adult dose of the medication in milligrams.
How this is calculated
Worked example, using the default values
- Identify Input ParametersChild's Age = 6, Child's Weight = 20, Adult Dose = 500 = 3 input(s) provided
- Calculate Young's Rule DoseYoung's Rule Dose166.7 = 166.7
- Calculate Clark's Rule DoseClark's Rule Dose142.9 = 142.9
- Calculate Fried's Rule DoseFried's Rule Dose0 = 0
- Calculate BSA-Based DoseBSA-Based Dose213 = 213
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