Free calculator

Dose-by-weight calculator

Enter the patient's weight and the ordered mg/kg. See the weight-based dosing lesson for the full method.

Patient weight

Ordered dose (mg/kg)

Daily dose divided into several doses

Dose

100 mg

1. Convert the patient's weight to kilograms

22 lb × ( 1 kg ÷ 2.2 lb )

= 10 kg

2. Multiply weight by the ordered mg/kg

10 kg × ( 10 mg ÷ 1 kg )

= 100 mg