How to Calculate MG/KG/DAY

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Milligrams per kilogram per day (mg/kg/day) is a simple way to calculate medication dosages for yourself or your patient. Follow these steps for calculating an accurate medication dosage.

Things You'll Need

  • Calculator
  • Pen
  • Paper

Determine your weight or your patient's weight in kilograms. This is done by dividing weight in pounds by 2.2. For example, if a person weighs 110 pounds, divide 110 by 2.2, which equals 50 kilograms (110/2.2 = 50). This is done because one kilogram is equal to 2.2 pounds.

Next, multiply milligrams by kilograms. For example, if a medication is recommended to be dosed at 100 mg/kg/day and the patient weighs 50kg: 100mg x 50kg = 5,000mg/day.

Here is a complete example: Your patient weighs 55lb. You have a drug order for 10mg/kg/day. First, divide 55lb by 2.2kg. This equals 25kg. You will then multiply 10mg x 25kg to equal 250mg. You will give your patient 250mg per day.

Tips & Warnings

  • Never use a zero after a terminal decimal point. This can lead to serious dosage errors. For example, 2 not 2.0 Always use a zero before a decimal point to prevent dosage errors. For example, 0.2 not .2
  • Think through your drug dosage. If it sounds like too much, it probably is. Question any dosage that doesn't make sense!

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