Drug Dosage Calculator

Weight-based dosing translates a patient's body weight and a prescribed dose per kilogram into a single, defensible number. With the move toward personalized medicine in 2026, getting that number right is what separates an effective treatment from an adverse drug reaction. Treat the figures here as an educational illustration of how the arithmetic works, not as clinical guidance for administering medication.

The math itself is simple multiplication: take the patient's weight in kilograms and multiply it by the ordered dose per kilogram, such as mg/kg. A drug prescribed at 5 mg/kg for someone weighing 70 kg therefore yields a total of 350 mg. Pharmacology relies on this same weight-based relationship across countless agents, which is exactly why a clean, consistent calculation matters.

Unit confusion is where weight-based dosing most often goes wrong. Mixing up kilograms and pounds, or milligrams and micrograms, can quietly distort the result, and a single misplaced decimal can produce a tenfold overdose or underdose. Because individual patient factors shape what the right dose actually is, the values shown here are for learning only and any real administration belongs in the hands of a healthcare professional.