Calculator form
Use a clinician-entered custom plan or select a reference profile, then review the output carefully before any real-world use.
Example data table
These are worked examples for demonstration only. They are not prescriptions.
| Scenario | Weight | Dose target | Doses/day | Strength | Each dose | Volume each dose |
|---|---|---|---|---|---|---|
| Scenario A | 8 kg | 30 mg/kg/day | 2 | 125 mg / 5 mL | 120 mg | 4.80 mL |
| Scenario B | 12 kg | 45 mg/kg/day | 2 | 400 mg / 5 mL | 270 mg | 3.38 mL |
| Scenario C | 18 kg | 25 mg/kg/day | 2 | 250 mg / 5 mL | 225 mg | 4.50 mL |
| Scenario D | 20 kg | 90 mg/kg/day | 2 | 400 mg / 5 mL | 900 mg | 11.25 mL |
Formula used
1. Total daily mg = Weight (kg) × Dose target (mg/kg/day)
2. Adjusted daily mg = Minimum of calculated daily mg and entered maximum daily mg, if a cap exists
3. Each dose mg = Adjusted daily mg ÷ Doses per day
4. Concentration (mg/mL) = Suspension strength mg ÷ Suspension reference volume mL
5. Each dose mL = Each dose mg ÷ Concentration (mg/mL)
6. Course total mL = Each dose mL × Doses per day × Duration days
7. Estimated bottles = Ceiling of course total mL ÷ Bottle size mL
How to use this calculator
- Enter age and weight in kilograms.
- Select a custom clinician-entered plan or a reference profile.
- Enter or confirm the dose target in mg/kg/day.
- Choose how many doses are given each day.
- Enter the suspension strength exactly as printed on the bottle.
- Add duration, optional maximum daily mg, and optional bottle size.
- Mark any allergy or renal caution flags for added warnings.
- Submit the form and review the results above the form.
- Use the graph, export buttons, and example table for review.
- Confirm every real medication decision with a licensed clinician.
FAQs
1) What does mg/kg/day mean?
It means the total amount of amoxicillin planned for one full day, scaled to body weight in kilograms before dividing into separate doses.
2) Why does the calculator ask for suspension strength?
Different bottles contain different amounts of medicine per 5 mL. The strength is needed to convert milligrams into the liquid volume actually measured.
3) Why can results differ between profiles?
Reference profiles use different mg/kg/day targets and different dosing frequencies. That changes both the daily milligram total and the volume required per dose.
4) Can this be used for infants younger than three months?
It can display arithmetic, but infants need extra caution. Immature renal function and age-specific labeling make clinician verification especially important.
5) What if the child has a penicillin allergy?
Do not rely on the calculated result alone. Allergy history can change whether amoxicillin should be used at all.
6) Why is 40 kg flagged?
Many pediatric weight-based references apply to children under 40 kg. At or above that weight, adult-labeled approaches are often considered instead.
7) Does kidney function matter?
Yes. Reduced kidney function can affect clearance and change the needed dose or dosing interval.
8) Is this calculator a prescription?
No. It is a structured math and review tool. The actual medication choice, dose, schedule, and duration must come from a licensed clinician.