Enter the steam flow and steam quality into the calculator to determine the condensate flow rate. This calculator helps in understanding the amount of condensate produced from steam at a certain quality level.

Condensate Flow Rate Formula

The following formula is used to calculate the condensate flow rate.

CFR = SF * (1 - SQ / 100)


  • CFR is the condensate flow rate (pounds per hour)
  • SF is the steam flow (pounds per hour)
  • SQ is the steam quality (percentage of steam that is vapor)

To calculate the condensate flow rate, multiply the steam flow by the complement of the steam quality percentage.

What is Condensate Flow Rate?

Condensate flow rate is the measure of the mass of condensate produced per hour when steam is cooled below its saturation temperature. It is an important parameter in steam systems for the design and operation of condensate return lines and heat exchangers. The quality of steam, which is the proportion of steam that is vapor, directly affects the amount of condensate generated.

How to Calculate Condensate Flow Rate?

The following steps outline how to calculate the Condensate Flow Rate.

  1. First, determine the steam flow (SF) in pounds per hour.
  2. Next, determine the steam quality (SQ) as a percentage of steam that is vapor.
  3. Next, gather the formula from above = CFR = SF * (1 – SQ / 100).
  4. Finally, calculate the Condensate Flow Rate (CFR) in pounds per hour.
  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.

steam flow (SF) = 500 lbs/hr

steam quality (SQ) = 90%