IV Drug Calculation Tutorial


Volume/Time – IV mL Rate Questions

Given a certain amount of liquid and a time period, what is the necessary IV flow rate in mL/hr? Measurement used when IV regulated electronically by infusion pump.


Volume (mL)
Time (hr)
 =  Y (Flow Rate in mL/hr)

Example: Infuse 250 mL over the next 120 minutes by infusion pump.

Volume (mL)
Time (hr)
 =  Y (Flow Rate in mL/hr)

Convert 120 minutes to hours.

  • min → hr    ( ÷ by 60 )
  • 120 min ÷ 60 = 2 hr
250 mL
2 hr
 =  125 mL/hr

Example: Ordered 1000 mL D5W IV to infuse in 10 hours by infusion pump.

Volume (mL)
Time (hr)
 =  Y (Flow Rate in mL/hr)
1000 mL
10 hr
 =  100 mL/hr




Photo of author
Anna Curran. RN, BSN, PHN

Anna Curran. RN, BSN, PHN
Clinical Nurse Instructor

Emergency Room Registered Nurse
Critical Care Transport Nurse
Clinical Nurse Instructor for LVN and BSN students

Anna began writing extra materials to help her BSN and LVN students with their studies and writing nursing care plans. She takes the topics that the students are learning and expands on them to try to help with their understanding of the nursing process and help nursing students pass the NCLEX exams.

Her experience spans almost 30 years in nursing, starting as an LVN in 1993. She received her RN license in 1997. She has worked in Medical-Surgical, Telemetry, ICU and the ER. She found a passion in the ER and has stayed in this department for 30 years.

She is a clinical instructor for LVN and BSN students and a Emergency Room RN / Critical Care Transport Nurse.

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