Antibiotic Dose by Weight Calculator
Enter a weight and select a reference regimen to illustrate its weight-based daily and per-administration amounts. A prescriber must select and verify the actual regimen.
Use the Antibiotic Dose by Weight Calculator
Patient Details
Educational arithmetic only — not a prescription or a medication-safety check. The tool does not collect age, indication, allergies, pregnancy, formulation, kidney/liver function, interactions, or local resistance. A licensed prescriber and pharmacist must select and verify the complete regimen before any antibiotic is administered.
Enter weight and select an antibiotic to calculate the dose.
Total Daily Dose
mg / day
Dose per Administration
mg / dose
Frequency
Weight Used
kg
Configured Reference Range
5-Day Dosing Schedule
Summary
Enter a weight and select a reference regimen to illustrate its weight-based daily and per-administration amounts. A prescriber must select and verify the actual regimen.
How it works
- Enter the patient weight in kilograms or pounds — the tool converts automatically.
- Select the antibiotic from the dropdown list.
- Choose the indication or dosing tier if multiple options exist.
- The calculator applies the selected reference mg/kg/day value and divides by its configured frequency.
- Results show total daily dose, dose per administration, and the patient-specific configured mg/kg range.
- A notice appears when the arithmetic result is limited by the configured absolute daily cap.
Use cases
- Illustrate amoxicillin mg/kg arithmetic for a teaching example.
- Explore how a multi-day azithromycin reference schedule changes after day one.
- Compare the displayed trimethoprim-based arithmetic with a prescribed regimen.
- Compare weight-based arithmetic across the listed educational reference regimens.
- See how an absolute daily cap changes a weight-based calculation.
- Compare dosing across multiple antibiotics for the same patient weight.
- Support clinical education and pharmacology learning.
- Practice converting between mg/kg/day and mg per administration.