If we divide 3/4, we obtain 0.75. Therefore, you will need to convert the order dose from milligrams (mg) to micrograms (mcg) so that you have the same units:If you need to review how to convert units of measurement, see section on units of measurement above.Once stock strength and dose ordered are expressed in the same units of measurements, the formula can be applied:This activity will guide you through the process to calculate tablet doses.Yes, in this example the stock available is expressed in mg, and the dose required is expressed in g.Thus, you need to convert the order dose from g to mg. To convert from larger to smaller units: The dose prescribed is now expressed in mg: 1000 mg.No, in this example strength and dose required are expressed in mg.Yes, in this example dose required is expressed in mcg and strength is expressed in mg.Thus, you will need to convert from smaller to larger units of measurement:The formula will now be applied to calculate volume doses, including the volume of stock solution.

Thus: Dose= 15mg (prescribed dose) x 28 (child’s weight in kg) = 42mg dose requiredTo calculate the drug suspension dose, you will use the formula to calculate drug dosages that uses the stock strength, stock required and volume strength.Following the previous example: paracetamol is ordered for children at a dose of 15mg/kg/dose to a maximum of 4 doses per day. We will cover math for nurses thoroughly on this page. You can view them on-screen, and then print them, with or without answers. In this case, the stock strength is presented in mcg, but the order is in mg. Hint: you are converting from a smaller to a larger unit.Incorrect. Five and a three quarters of an hour = 5 and 3/4 hr. You need to know how to calculate required dosages accurately, including doses of tablets, doses of solutions, and intravenous fluid rates and medications.These drug calculations will require the application of some basic mathematics such as addition, subtraction, multiplication, and division. Since you are converting from a larger to a smaller unit, you need to multiply by 1000 or move the decimal point three places to the right.Incorrect. Working with Percents A child’s weight is 28kg, and the stock strength is 24mg/mL.Stock required= 420 mg (this is the stock required that was calculated in the previous step using the child’s weight)Finally, we know that each dose is 420 mg, and the child can have 4 doses per day.Therefore: 420 mg X 4 = 1680 mg per day. It is important to understand what it is meant by strength and volume, as you will need to check this information about the drug to use it correctly in the formula.This video is very helpful if you need more information on how to read the stock strength and stock volume of medication (that is, the amount of drug and solution available), and how to calculate the volume of solution required.The formula to calculate the required dose includes the stock required (prescribed by the doctor), the stock strength (amount of drug available) and volume (amount of solution available).Before you apply the formula, take into consideration two key aspects:In the next section, this formula will be applied to calculate oral (tablets) and volume doses.To calculate oral doses, the formula can be simplified. Every worksheet has thousands of variations, so you need never run out of practice material. You will need to be able to calculate dosages for oral and liquid medications.When using formulas, the most important step is to identify and understand what each part of the formula means.


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