mg/kg to Tablets Calculator
Convert weight-based dosing (mg/kg) into total mg and tablets (mg/tablet)
Convert a weight-based dose (mg/kg) into tablets
How it works
This calculator converts a weight-based medication order (mg/kg) into a total dose in mg, then converts that dose into a tablet amount using the available tablet strength (mg/tablet).
It’s commonly used in paediatrics, antibiotics, analgesia, and any protocol where dosing depends on patient weight.
Formula
Worked examples
Example 1: 70 kg, 10 mg/kg, 500 mg/tablet
Tablets = 700 ÷ 500 = 1.4
Example 2: 25 kg, 15 mg/kg, 250 mg/tablet
Tablets = 375 ÷ 250 = 1.5
Example 3: 80 kg, 20 mg/kg, 400 mg/tablet
Tablets = 1600 ÷ 400 = 4
When this is used
- Weight-based antibiotic or analgesic dosing protocols
- Paediatric medication administration
- Quick conversion to confirm whether tablet splitting is required
Safety note: This calculator does not apply maximum dose limits. Always check single-dose and daily maximums in your local formulary. If needed, use the “max dose cap” calculator.
Frequently asked questions
Clinical reminder: Always follow local protocols and consult medication information sheets. These examples are for calculation practice only.
References & sources
Use these for dosing guidance, maximum doses, and medication safety standards.
Medication safety resources and error prevention guidance.
Australian product information and safety updates.
Prescribing guidance, formulations, and administration notes.
Paediatric prescribing guidance.
Australian medicines information and prescribing resources.