Dosage By Weight Calculator
Enter patient weight and dose per kg to instantly calculate the correct medication dose in mg or ml.
Patient & Dose Inputs
Prescribed milligrams per kilogram of body weight.
Used to calculate total daily dose.
Enter to convert mg dose to ml volume.
If the calculated dose exceeds this, a warning is shown.
Single Dose
—
mg
—
ml
(volume)
Weight used
—
Dose rate
—
Total daily dose
—
Enter weight and dose rate to see the result.
Disclaimer: This tool is for educational reference only. Always verify doses with a licensed pharmacist or physician before administration.
Summary
Enter patient weight and dose per kg to instantly calculate the correct medication dose in mg or ml.
How it works
- Enter the patient's weight in kilograms or pounds.
- Input the prescribed dose rate in mg per kg (mg/kg).
- Optionally enter the medication concentration in mg/ml.
- The calculator multiplies weight × dose rate to get the total mg dose.
- If concentration is provided, it divides total mg by mg/ml to give volume in ml.
- Results update instantly as you type — no button press needed.
Use cases
- Calculate pediatric medication doses based on child's weight.
- Verify adult antibiotic or analgesic dosing before administration.
- Convert a mg dose to ml for liquid medications or oral suspensions.
- Double-check a prescribed dose against standard mg/kg guidelines.
- Calculate ibuprofen or acetaminophen dose for children by weight.
- Assist nurses and caregivers with weight-based drug calculations.
Frequently Asked Questions
Last updated: 2026-06-09 ·
Reviewed by Nham Vu