Can this calculator tell me what dose to take?

No. It only checks arithmetic after the dose, frequency and concentration are known from a label, prescription or clinician instruction.

Why do I need the concentration in mg/mL?

A liquid dose in milligrams cannot be converted to milliliters without knowing how many milligrams are in each milliliter of that exact product.

Can I use this for antibiotics?

Only to verify math from a prescription or official label. Antibiotic choice, dose, interval and duration depend on diagnosis, age, kidney function, allergies and local guidance.

Drug Dosage Calculator

Check medication dose arithmetic from a label or prescription: mg/kg, concentration in mg/mL, mL per dose, doses per day, course volume and entered maximum-dose limits.

Medication

Example concentration: 24 mg per 1 mL for a 120 mg/5 mL product. Use only the dose and frequency from the FDA-approved label, DailyMed label, package label, or prescriber.

Check the exact strength, age limits, route, and directions in the FDA-approved label, DailyMed label, package label, or prescriber order.

Patient weight, kg

Dose, mg/kg per dose

Concentration, mg/mL

Example concentration: 24 mg per 1 mL

Doses per day

Course duration, days

Maximum doses from the label or prescriber order: used only to check the limits you enter.

Max single dose, mg

Max daily dose, mg

Max mg/kg/day

What this dosage calculator does

This tool checks arithmetic after you already have the dose from a prescription, package label, DailyMed label or clinician instruction. It does not choose a medicine, diagnose a condition or decide whether the dose is appropriate for a patient.

single dose_{m g} = W_{k g} \times D_{m g / k g}

Weight-based dose from patient weight and the label or prescriber dose per kilogram.

volume_{m L} = \frac{single dose _{m g}}{concentration _{m g / m L}}

Liquid medicine conversion from milligrams to milliliters.

Not prescribing advice

Use the result only to check math against the exact product label and prescriber directions. Renal impairment, liver disease, age limits, interactions, duplicate ingredients and high-risk medicines require clinician or pharmacist review.

Dose limits and liquid concentration

Input	Why it matters
Dose in mg/kg	Must come from the label or prescriber, not from this calculator.
Concentration in mg/mL	Different liquids can contain different strengths of the same active ingredient.
Doses per day	Determines total daily exposure and duplicate-dose risk.
Maximum dose fields	The calculator only checks the limits you enter.

For oral liquid medicines, use an oral syringe or the dosing device supplied with the product. Household spoons are not reliable measuring devices.

Frequently Asked Questions

Sources and References

Calculations are based on the listed reference sources. Links open in a new tab.

Updated: June 2, 2026

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