Drug Dose Calculator
Weight-based (mg/kg) and BSA-based (mg/m²) doses with volume to give.
Enter your values to see the result.
For education and clinical decision support only. Results do not replace professional judgment, local protocols or the product information, so always verify doses and values before acting on them.
Continue your work
- Body Surface Area Calculator — Calculate BSA for mg/m² doses.
- IV Infusion Rate Calculator — Convert the dose to an infusion rate.
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Clear instructions
Find steps, examples and limitations below.
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How to use the Drug Dose Calculator
Weight-based (mg/kg) and BSA-based (mg/m²) doses with volume to give.
- 1 Choose the dosing basis and enter the prescribed dose per dose or per day.
- 2 Enter weight (and height for mg/m²) and doses per day.
- 3 Add the maximum dose and concentration to get the capped dose and volume.
Example and practical tips
15 mg/kg for a 20 kg child is 300 mg per dose; with a 120 mg/5 mL suspension that is 12.5 mL.
Frequently asked questions
Per dose or per day?
Prescriptions give either. Choose “per day” when the total daily dose is divided into several doses.
Why add a maximum dose?
Weight-based doses can exceed adult maximums in heavier patients. The cap keeps the dose within the limit.
Can I use this to make treatment decisions?
It supports education and clinical decision-making but does not replace clinical judgment, local protocols or product information. Always double-check results.
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