Enter the volume of fluid to be administered and the time over which the fluid should be administered, as well as the drop factor of the IV set into the calculator to determine the Drip Factor.

Drip Factor Formula

The following formula is used to calculate the Drip Factor.

DF = (V / T) * F

Variables:

  • DF is the Drip Factor (drops per minute)
  • V is the volume of fluid to be administered (ml)
  • T is the time over which the fluid should be administered (minutes)
  • F is the drop factor of the IV set (drops/ml)

To calculate the Drip Factor, divide the volume of fluid to be administered by the time over which the fluid should be administered. Multiply the result by the drop factor of the IV set. The result is the Drip Factor in drops per minute.

What is a Drip Factor?

A Drip Factor is a term used in medical settings, specifically in intravenous (IV) therapy, to control the rate at which medication or fluid is delivered to the patient. It is usually measured in drops per minute (gtts/min) and is determined by the size of the IV tubing (microdrip or macrodrip). The drip factor is crucial in ensuring the patient receives the correct dosage of medication or fluid over the appropriate period.

How to Calculate Drip Factor?

The following steps outline how to calculate the Drip Factor.


  1. First, determine the volume of fluid to be administered (V) in milliliters (ml).
  2. Next, determine the time over which the fluid should be administered (T) in minutes.
  3. Next, determine the drop factor of the IV set (F) in drops per milliliter (drops/ml).
  4. Next, gather the formula from above = DF = (V / T) * F.
  5. Finally, calculate the Drip Factor.
  6. 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.

volume of fluid to be administered (V) = 500 ml

time over which the fluid should be administered (T) = 60 minutes

drop factor of the IV set (F) = 20 drops/ml