Medical Dosage Calculations For Dummies
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Whenever you’re administering intravenous (IV) infusions, you need to know the flow rate, infusion time, and total volume. Fortunately, calculating any one of these three variables is easy to do when you know the other two variables. Use the following equations:

  • flow rate (mL/hr) = total volume (mL) ÷ infusion time (hr)

  • infusion time (hr) = total volume (mL) ÷ flow rate (mL/hr)

  • total volume (mL) = flow rate (mL/hr) × infusion time (hr)

For example, if you must administer 1 L (1,000 mL) of fluid over 4 hours, use the first formula to calculate the flow rate, like so:

flow rate (mL/hr) = total volume (mL) ÷ infusion time (hr)
flow rate (mL/hr) = 1,000 ÷ 4
flow rate (mL/hr) = 250

The flow rate is 250 mL/hr.

About This Article

This article is from the book:

About the book authors:

Dr. Richard W. Snyder, DO is an osteopathic physician, board certified in both internal medicine and nephrology. He has authored and coauthored several articles in peer-reviewed journals.

Barry Schoenborn is a longtime technical writer and is the coauthor of Technical Math For Dummies.

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