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Dosage Calculator

Calculate safe dosages based on your profile

Calculated Dose
Enter the herb information and patient details to calculate an age-appropriate dose.

Calculating dose for Gentiana purpurea

Standard adult dose: 2-4ml tincture 3x/day; 1-2g root tea

Reference child dose: Not established

tinctureteaextract
YearsMonths
kglbs

Enter details and click "Calculate" to see results

Clark's Rule

Dose based on weight ratio

Child Dose = (Weight in kg / 68) x Adult Dose

Dose based on weight ratio

Frequently asked questions

How do I calculate a safe herbal dose for a child?

Enter the adult reference dose, plus the child's age and weight. HerbAlly applies Clark's rule (weight-based) and Young's rule (age-based) and caps the result at the adult dose. Always consult your healthcare provider.

What is Clark's rule vs Young's rule?

Clark's rule scales by weight (child weight / 68kg × adult dose). Young's rule scales by age (age / (age+12) × adult dose). HerbAlly shows both so you can compare.

Is the herbal dosage calculator free?

Yes — free, evidence-based, no account required. Reference doses come from our 2,700+ herb database with PubMed, WHO and NCCIH sources.