Enter the effluent flow and the blood rate flow into the Calculator. The calculator will evaluate the Flow Fraction. 

Flow Fraction Formula



  • FF is the Flow Fraction ()
  • EF is the effluent flow
  • BRF is the blood rate flow

To calculate Flow Fraction, divide the effluent flow by the blood rate flow.

How to Calculate Flow Fraction?

The following steps outline how to calculate the Flow Fraction.

  1. First, determine the effluent flow. 
  2. Next, determine the blood rate flow. 
  3. Next, gather the formula from above = FF = EF / BRF.
  4. Finally, calculate the Flow Fraction.
  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.

effluent flow = 430

blood rate flow = 300