Pediatric Dose Table: Estimated child dose (Clark's rule) by Adult dose
Reference table of estimated child dose (clark's rule) for Pediatric Dose across a range of adult dose values — exact, engine-computed figures you can read off at a glance.
Pediatric Dose Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Estimated child dose (Clark's rule)
142.9
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Pediatric Dose Calculator
The Pediatric Dose Calculator works out your estimated child dose (clark's rule) in an instant. Enter adult dose and child's weight and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the adult dose.
- Enter the child's weight.
- Read off your estimated child dose (clark's rule) — the calculator updates automatically, with no button to press.
Formula
The Pediatric Dose Calculator uses the formula:
Estimated child dose (Clark's rule) = Adult dose × Child's weight ÷ 70
Worked example
For example, with adult dose of 500 mg and child's weight of 20 kg, the estimated child dose (clark's rule) is 142.9.
| Adult dose | 500 mg |
|---|---|
| Child's weight | 20 kg |
| Estimated child dose (Clark's rule) | 142.9 |
|---|
Results are estimates for educational use, not professional advice.
Frequently asked questions
It estimates a child's dose as adult dose × child weight ÷ 70 kg. A 20 kg child gets about 143 mg of a 500 mg adult dose.
Weight-based dosing reflects body size better than age, giving a more appropriate amount for a child.
No. It is for education only. Always follow the label and a healthcare professional's instructions for actual dosing.
Yes, such as Young's rule based on age. Modern practice usually uses weight-based or body-surface-area dosing under medical guidance.
The Pediatric Dose Calculator uses the formula: Estimated child dose (Clark's rule) = Adult dose × Child's weight ÷ 70. For example, with adult dose of 500 mg and child's weight of 20 kg, the estimated child dose (clark's rule) is 142.9.
Enter the adult dose. Enter the child's weight. Read off your estimated child dose (clark's rule) — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Pediatric Dose: Formula, Steps & Examples
Learn how to calculate Pediatric Dose — the formula explained step by step, with worked examples and a free calculator to check your answer.