Dose por Peso (mg)

dose = mg/kg · peso.
Created by
Renato Passos, Eng. de Software
Reviewed by
Renato Passos, Eng. de Software

Last updated: Apr 18, 2026

Dose (mg)
700,00

Formula

mg = mg/kg · peso

About this calculator

The Dose by Weight calculator helps estimate the amount of medication in milligrams to be given to a patient, based on body weight and the prescribed dose per kilogram. The simple calculation, mg = mg/kg × weight, yields the total milligram amount to be administered.

To use it, enter the prescribed dose in milligrams per kilogram and the patient's weight in kilograms. The calculator performs the multiplication and displays the result in milligrams, ensuring the exact dose for children, the elderly, or animals requiring specific dosing.

Real‑world cases include dose adjustments in pediatrics, where the initial dose is often lower and must be recalculated as the child grows, or in veterinary medicine, where animal weight can vary widely. It can also be handy in emergencies to avoid under‑ or overdosing.

Common caution: confirm the weight unit (kg) and dose unit (mg/kg). Avoid arbitrary rounding, as small differences can affect efficacy or safety. Always verify the calculation with a healthcare professional before administering the drug.

Frequently asked questions

How do I convert the patient's weight from pounds to kilograms?

Multiply the value in pounds by 0.4536 to obtain the weight in kilograms.

Should I round the calculated dose?

Only round if the prescription or drug label explicitly requires it, because rounding can affect efficacy or safety.

Can this calculator be used for medications taken continuously?

Yes, but the daily dose may need adjustment over time; consult a healthcare professional.

Is it possible to use the calculator for animals?

Yes, as long as the dose is expressed in mg/kg and the animal’s weight is in kilograms.

What if the patient’s weight changes after the dose has been calculated?

Recalculate the dose immediately and adjust the amount administered if necessary.

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