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Pharmacy Calculations 3 – Percent Weight-Volume, Weight-Weight, and Volume-Volume Relationships

Pharmacy compounding often involves dissolving a solute (i.e., the active pharmaceutical ingredient) inside a solvent (i.e., the base) to prepare a final homogenous mixture, known as a solution. The appropriate use of concentration expressions, such as weight-volume (w/v), weight-weight (w/w), and volume-volume (v/v), is vital for determining accurate solute and solvent amounts for a prescribed pharmaceutical preparation.

This eight-part eLearning program addresses weight-volume (w/v), weight-weight (w/w), and volume-volume (v/v) relationships using three calculation methods: the concentration-volume equation (C1V1 = C2V2), the ratio and proportion method, and the dimensional analysis method. This multiple method approach will provide participants with the necessary framework for problem solving and formulation verification in actual practice. Systematic instructions on how to use these calculation methods are provided through animations and interactive problem solving exercises to optimize engagement and retention. Completion of this eLearning program will provide participants with the confidence to accurately apply these essential pharmaceutical calculations in their day-to-day compounding practice.


Upon successful completion of the eLearning module you will receive an LP3 Network certificate, which can be printed and displayed in your compounding pharmacy as evidence of your training.


Intended audience

  • Pharmacists
  • Pharmacy Technicians
  • Training Supervisors
  • Auditors
  • Inspectors
  • Compliance Specialists


Learning Objectives

  • Identify the basic equation for weight-volume (w/v), weight-weight (w/w), and volume-volume (v/v) relationships.
  • Understand how to express the basic w/v, w/w, and v/v relationships in fraction and decimal form.
  • Recognize the basic w/v, w/w, and v/v expressions as percentages.
  • Recognize the reason for use of w/v, w/w, and v/v expressions in pharmacy practice.
  • Solve w/v, w/w, and v/v relationship-type problems using the concentration-volume equation, the ratio and proportion method, and the dimensional analysis method.

Hardware/software requirements

The eLearning module is best viewed on a computer or a tablet* in landscape mode.

*Note: If you are using a Windows 10 tablet, we recommend using a mouse (touchscreen compatibility varies by model).

High-speed internet connectivity and an updated internet browser are required to take the eLearning module. The broadband recommended is 1 Mbps or better. The minimum browser requirements to take the module are:

  • Google Chrome v39 or later
  • Mozilla Firefox v34 or later
  • Internet Explorer v8 or later
  • Microsoft Edge
  • Apple Safari v6 or later
Course summary
Available credit: 
  • 2.50 Contact Hours


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Cancellation and refund policy: 

There are no refunds, returns, or transfers upon purchase of the eLearning Module.


Course expires: