How to Calculate w/v (Weight by Volume)

By Tim Banas; Updated April 24, 2017
Weight by volume is a common way to express the concentration of a solution.

Weight by volume is an easy way to express the concentration of a solution. It is calculated by dividing the mass in grams of the solute -- or what is dissolved in the liquid -- by the volume in milliliters of the whole solution. Weight by volume is usually abbreviated as w/v and expressed as a percentage.

Example w/v Calculation

Suppose you want to express the concentration of a sucrose -- table sugar -- solution you are making in w/v. If you created a 750-milliliter solution by adding 150 grams of sucrose to water, the w/v calculation would look like the following:

150 g / 750 mL = .20 or 20% w/v sucrose

Another example could be if you created a 200 mL solution by dissolving 57.0 grams of salt in water. The calculation would look like the following:

57.0 g / 200 mL = .285 or 28.5% w/v salt

About the Author

Tim Banas started writing professionally in 2009 after teaching high school science for seven years. He has since written and edited for various online publications including Demand Studios, FYILiving.com, Tree.com and BinaryOption.com. He has a Master of Science in biology from Southern Illinois University.