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There are 3 primary methods for calculating medication dosages; Dimensional Analysis, Ratio Proportion, and Formula or Desired Over Have Method. We will explore the Desired Over Have or Formula Method, one of these 3 methods, in more detail. Desired Over Have or Formula Method uses a formula or equation to solve for an unknown quantity (x), much like ratio proportion. Drug calculations require using conversion factors, for example, when converting from pounds to kilograms or liters to milliliters. Simplistic in design, this method allows clinicians to work with various units of measurement, converting factors to find the answer. These methods are useful in checking the accuracy of the other methods of calculation, thus acting as a double or triple check.

A 2016 study evaluated the role confidence plays in overall arithmetic in drug calculation skills. Study participants attended remedial math classes from a wide range of educational backgrounds and age dynamics seeking a first degree in nursing, a foundation degree, or post-registration courses (Shelton, 2016). The study revealed one-third of students feel a lack of confidence, which originated in an earlier stage of education, dating back to a primary school environment (Shelton, 2016). The study concluded that confidence plays a role in dosage calculations and the overall performance of mathematical calculations and can be improved in an environment that fosters a deep-learning approach (Shelton, 2016).

All members of the interprofessional team are responsible for dose calculations. Physicians, nurses, and pharmacists all must be knowledgeable regarding the desired formulas. This technique is invaluable in properly treating patients.