Enter the volume to be infused and the infusion time into the calculator to determine the infusion rate per hour. This calculator helps in setting up intravenous therapy with a constant rate.

Infusion Rate Per Hour Formula

The following formula is used to calculate the infusion rate per hour.

IR = V / T

Variables:

  • IR is the infusion rate (mL/hour)
  • V is the volume to be infused (mL)
  • T is the infusion time (hours)

To calculate the infusion rate per hour, divide the volume to be infused by the infusion time.

What is an Infusion Rate Per Hour?

An infusion rate per hour is a measure of the flow rate at which intravenous fluid is administered to a patient. It is typically measured in milliliters per hour (mL/hour) and is crucial for ensuring that the patient receives the correct amount of fluid or medication over the prescribed period.

How to Calculate Infusion Rate Per Hour?

The following steps outline how to calculate the Infusion Rate Per Hour.


  1. First, determine the volume to be infused (V) in milliliters (mL).
  2. Next, determine the infusion time (T) in hours.
  3. Use the formula from above = IR = V / T.
  4. Finally, calculate the Infusion Rate Per Hour (IR) in mL/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.

Volume to be infused (V) = 500 mL

Infusion time (T) = 4 hours