Calculate mg/kg, daily limits, and liquid volumes easily. Compare weight-based and surface-area methods for flexibility. Always confirm prescriptions with licensed pediatric clinicians before use.
Use the fields below to estimate weight-based, daily, or surface-area dosing. The results appear above this form after submission.
This calculator is for education and workflow support. It does not replace a licensed pediatrician, pharmacist, hospital guideline, renal or hepatic adjustment protocol, or the official drug monograph. Verify age restrictions, indication, route, formulation strength, dose ceilings, allergies, and interval before administration.
| Case | Weight | Height | Mode | Input | Frequency | Concentration | Estimated Result |
|---|---|---|---|---|---|---|---|
| Case A | 12 kg | 90 cm | mg/kg/dose | 10 mg/kg | 3/day | 125 mg / 5 mL | 120 mg per dose, 4.8 mL |
| Case B | 18 kg | 108 cm | mg/kg/day | 30 mg/kg/day | 2/day | 250 mg / 5 mL | 270 mg per dose, 5.4 mL |
| Case C | 32 kg | 135 cm | mg/m²/day | 300 mg/m²/day | 2/day | 100 mg / 1 mL | About 0.55 mL per dose |
Single Dose (mg) = Weight (kg) × Ordered Dose (mg/kg/dose)
Daily Dose (mg) = Weight (kg) × Ordered Dose (mg/kg/day)
Single Dose (mg) = Daily Dose ÷ Frequency per Day
BSA (m²) = √[(Height in cm × Weight in kg) ÷ 3600]
Daily Dose (mg) = BSA × Ordered Dose (mg/m²/day)
Single Dose (mg) = Daily Dose ÷ Frequency per Day
mg/mL = Drug Amount (mg) ÷ Volume (mL)
Volume per Dose (mL) = Final Single Dose (mg) ÷ Concentration (mg/mL)
Final Dose = Lesser of calculated dose and entered maximum limits
This page first checks a single-dose ceiling, then checks the daily ceiling, and recalculates the per-dose amount if a daily cap applies.
It estimates pediatric medication amounts using weight-based or surface-area methods. It can also convert the final drug amount into milliliters when you enter the liquid concentration.
Yes. The form accepts pounds and automatically converts them to kilograms before running the calculation. You should still confirm that the original patient weight is current and accurately measured.
Use BSA mode only when the medication reference specifically orders dosing in mg per square meter. Height and weight are both required for that calculation.
Many pediatric references include dose ceilings. These fields help prevent a calculated amount from exceeding the single-dose or daily maximum you enter from a trusted drug reference.
No. It is only a calculation aid. Final medication selection, indication, interval, dilution, route, contraindications, and monitoring must be reviewed by qualified clinicians.
The page divides the final dose in milligrams by the product concentration in mg per mL. It then shows the dose volume and a rounded volume for easier administration planning.
If the calculated dose exceeds a configured ceiling, the tool reduces it to the maximum allowed value. The displayed daily or per-dose value is then recalculated from that cap.
No. Some medicines require age bands, renal adjustment, infusion rates, titration rules, loading doses, or disease-specific protocols. Those rules must be checked separately before use.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.