Health & Fitness

Medication Dosage Calculator

An educational, weight-based dose reference for common OTC medications. This is not medical advice - always confirm dosing with a pharmacist, doctor, or the product label.

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Medication Dosage Calculator
Weight-based dose calculator for common OTC medications
Disclaimer: Always consult a doctor or pharmacist before taking medications. This tool is for informational reference only.
Select medication and enter weight

Medical disclaimer. This calculator is provided for educational and informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional regarding your health, diet, exercise, or medication decisions. Read full disclaimer →

About Medicine Dosage Calculator

This calculator computes weight-based paediatric and adult medication dosages using the formula: Dose = Weight (kg) x Dose per kg (mg/kg). Common weight-based dosing examples: Paracetamol 10-15 mg/kg every 4-6 hours (max 60 mg/kg/day); Ibuprofen 5-10 mg/kg every 6-8 hours (max 40 mg/kg/day); Amoxicillin 25-45 mg/kg/day divided every 8 hours.

Important: This calculator is a reference tool only - always verify dosage with a registered pharmacist or physician before administering. Doses for renally or hepatically impaired patients require adjustment. Maximum adult doses apply regardless of weight above approximately 50kg for most drugs. Paediatric dosing differs significantly from adult dosing due to differences in drug metabolism and elimination. Never exceed stated maximum doses. For emergency situations always contact a healthcare provider immediately.

Frequently Asked Questions

No. This tool is provided strictly for general educational reference and illustrates how weight-based dosing formulas work (Dose = weight in kg x dose per kg). It is not medical advice, is not a substitute for consulting a doctor or pharmacist, and should never be used as the sole basis for administering medication to yourself or anyone else, especially a child.
The general formula used for reference is Dose = Body Weight (kg) x Dose per kg (mg/kg), with the result capped at a maximum single-dose limit and a maximum daily total for the medication selected. Actual clinical dosing also depends on factors this simplified tool does not account for, such as age, kidney or liver function, other medications, and the specific product's concentration.
Aspirin is contraindicated in children and teenagers under 16 due to the risk of Reye's syndrome, a rare but serious condition linked to aspirin use during viral illness in children. This is exactly the kind of safety detail that only a pharmacist, doctor, or the product packaging can confirm correctly for a specific person - never give aspirin to a child without professional guidance.
Always verify the exact product concentration (mg per mL or per tablet, which varies by brand and formulation), confirm the dosing interval and maximum daily limit on the product label or from a pharmacist, and account for any other medications being taken to avoid duplicate ingredients (for example, combination cold/flu products often already contain paracetamol or ibuprofen). For infants, children, pregnant or breastfeeding individuals, or anyone with kidney, liver, or other health conditions, dosing should always be confirmed by a healthcare professional before use.
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