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Drug Dosage Calculator

Calculate medication dosage based on weight and standard dose parameters.

Complete Guide

Overview

Calculate medication dosage based on weight and standard dose parameters. Use this calculator to get instant, accurate results based on standard health formulas and guidelines.

⚠️This tool is for educational and screening purposes only and is not a substitute for professional medical advice.

How to Use

Enter your details in the input fields above.

Select your preferred units (metric or imperial) if available.

Click the Calculate button to view your instant results and interpretation.

Formula & Calculation

Refer to the in-depth guide below for complete calculation formulas.

Benefits of Using This Calculator

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Accurate Results

Provides instant calculations for drug dosage calculator.

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Clear Guidance

Compares your score against standard medical reference ranges.

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Fast & Free

No sign-up required — fast, private calculation on any device.

Pro Tips

Enter accurate measurements for the most reliable results.
Track your results over time to identify long-term trends.
Consult a qualified healthcare professional for medical interpretation.

In-Depth Guide

Drug Dosage Calculator: Weight-Based Medication Dosing Made Simple

Many medications — particularly in paediatrics, oncology, and intensive care — are prescribed based on body weight. The standard approach is expressing the dose as milligrams per kilogram (mg/kg), then converting to the volume of the available liquid or suspension. This calculator does that conversion for you.

The Formula

Total Dose (mg) = Weight (kg) × Dose Required (mg/kg)
Volume (mL) = Total Dose (mg) ÷ Concentration (mg/mL)

Worked Example

Child: 20 kg. Dose: 15 mg/kg. Paracetamol suspension: 250 mg/5 mL (= 50 mg/mL)
Total = 20 × 15 = 300 mg
Volume = 300 ÷ 50 = 6 mL

Calculate weight-based doses with our Drug Dosage Calculator.

Common Paediatric Weight-Based Doses

Drug	Typical Dose	Max Dose
Paracetamol	15 mg/kg every 4–6 hours	90 mg/kg/day
Ibuprofen	10 mg/kg every 6–8 hours	40 mg/kg/day
Amoxicillin	25–50 mg/kg/day in 3 doses	500 mg per dose

Important Safety Notes

Always check the maximum dose — many paediatric drugs have an adult maximum that caps weight-based dosing.
Double-check units — mg/mL vs mg/5mL vs mg/tablet require different calculations.
Never round up beyond maximum. Round to the nearest practical measurable volume (e.g., nearest 0.5 mL).
Different age groups have different safe doses for many drugs — always verify against your formulary.

Final Thoughts

Weight-based dosing calculations are essential in paediatric care. This calculator reduces arithmetic errors — but always verify your calculation against the prescribing formulary and product information leaflet.

Calculate weight-based doses with our free Drug Dosage Calculator.

This tool is for educational and reference purposes. All medication doses must be verified with a pharmacist or prescribing clinician before administration.