Calculator Inputs
Example Data Table
| Medicine | Weight | Ordered Dose | Strength | Frequency | Rounded Dose | Course Volume |
|---|---|---|---|---|---|---|
| Amoxicillin suspension | 18 kg | 10 mg/kg per dose | 250 mg / 5 mL | 3 times daily | 3.5 mL | 52.5 mL over 5 days |
| Ibuprofen oral suspension | 24 kg | 200 mg fixed dose | 100 mg / 5 mL | 4 times daily | 10 mL | 120 mL over 3 days |
| Acetaminophen liquid | 12 kg | 15 mg/kg per dose | 160 mg / 5 mL | 4 times daily | 5.5 mL | 44 mL over 2 days |
These examples illustrate method only. Real prescriptions must match the exact label, patient, and clinician instructions.
Formula Used
This calculator converts a prescribed amount into milliliters by using the labeled concentration. It supports fixed doses and weight-based doses.
Weight in kg = Weight in lb ÷ 2.20462
Concentration (mg/mL) = Label strength in mg ÷ Label volume in mL
Single dose in mg = Weight in kg × Ordered mg/kg per dose
Single dose in mL = Single dose in mg ÷ Concentration in mg/mL
Rounded dose in mL = Round(Single dose in mL ÷ Step) × Step
Daily volume = Rounded single dose × Doses per day
Course volume = Daily volume × Duration in days
Bottles needed = Ceiling(Course volume ÷ Bottle size)
Rounding is helpful for syringe readability, but it may slightly change the exact dose. The calculator reports that difference so you can review it before use.
How to Use This Calculator
- Enter patient weight and choose kilograms or pounds.
- Select weight-based dosing or a fixed prescribed dose.
- Type the liquid label strength exactly as printed, such as 250 mg per 5 mL.
- Enter dosing frequency, treatment days, bottle size, and rounding preference.
- Press Calculate Dosage to show results above the form.
- Review the exact volume, rounded volume, daily total, course total, and bottle count.
- Use the graph to visualize daily use and cumulative supply needs.
- Export the summary with the CSV or PDF buttons after calculation.
Frequently Asked Questions
1) What does this calculator actually compute?
It converts a prescribed amount into milliliters using the medicine’s label strength. It also estimates daily intake, total course volume, bottle coverage, and a rounded administration amount.
2) Can I use pounds instead of kilograms?
Yes. The calculator converts pounds into kilograms automatically before any weight-based dose math is performed.
3) Why is there both an exact dose and a rounded dose?
Exact volume comes directly from the formula. Rounded volume makes measuring easier with a syringe or cup. Review the percentage difference before using a rounded value.
4) What does mg per 5 mL mean?
It describes concentration. For example, 250 mg per 5 mL means every 5 mL contains 250 mg of medicine. The calculator converts that into mg per mL automatically.
5) Should I follow this tool or the prescription label?
Always follow the prescription label and clinician instructions. Use the calculator as a checking aid, not as a replacement for medical directions.
6) Why does the bottle count matter?
Bottle count helps estimate whether the current supply can finish the full course. This is useful when planning refills or dispensing enough medicine for treatment.
7) Which measuring device is better?
Small doses are usually easier to measure with an oral syringe. Larger doses may work with a dosing spoon or oral cup, depending on the label directions.
8) Can this calculator decide the correct medicine dose for a patient?
No. It only performs arithmetic from entered values. Dose selection should come from a licensed clinician, pharmacist, or the official prescribed instructions.