Enter the amount of plaster (oz) and water (oz) into the Calculator. The calculator will evaluate the Plaster To Water Ratio. 

Plaster To Water Ratio Formula

PWR = P / W


  • PWR is the Plaster To Water Ratio (oz/oz)
  • P is the amount of plaster (oz)
  • W is the amount of water (oz)

To calculate Plaster To Water Ratio, simply divide the amount of plaster by the amount of water.

How to Calculate Plaster To Water Ratio?

The following steps outline how to calculate the Plaster To Water Ratio.

  1. First, determine the amount of plaster (oz). 
  2. Next, determine the amount of water (oz). 
  3. Next, gather the formula from above = PWR = P / W.
  4. Finally, calculate the Plaster To Water Ratio.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

amount of plaster (oz) = 323

amount of water (oz) = 234