Enter the field capacity and the wilting point into the Calculator. The calculator will evaluate the Plant Available Water. 

Plant Available Water Formula



  • PAW is the Plant Available Water ()
  • FC is the field capacity
  • WP is the wilting point

To calculate plant available water, subtract the wilting point from the field capacity.

How to Calculate Plant Available Water?

The following steps outline how to calculate the Plant’s Available Water.

  1. First, determine the field capacity. 
  2. Next, determine the wilting point. 
  3. Next, gather the formula from above = PAW = FC – WP.
  4. Finally, calculate the Plant’s Available Water.
  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.

field capacity = 95

wilting point = 60