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Formula
Determines the drops per minute needed to deliver a specific volume over time.
Worked Example
Calculating IV Drip Rates
- The formula: Drip Rate (gtt/min) = [Total Volume (mL) × Drop Factor (gtt/mL)] / Total Time (min)
- The Drop Factor is specific to the IV tubing set (Macro-drip is usually 10, 15, or 20; Micro-drip is 60)
- To get time in minutes from hours, multiply by 60
- Always double-check calculations before starting an infusion
This tool provides a mathematical calculation. Clinical judgment and institutional protocols must always be followed when administering medications or fluids.
You can also calculate changes using our Body Fat Calculator or Calorie Calculator.
Frequently Asked Questions
What is a drop factor?
The drop factor is the number of drops (gtt) it takes to equal 1 mL of fluid. It is printed on the IV tubing packaging.
What is the difference between macro and micro drip?
Macro-drip sets deliver larger drops (10-20 gtt/mL) and are used for adult fluid resuscitation. Micro-drip sets deliver tiny drops (60 gtt/mL) and are used for precise dosing, often in pediatrics.
How do I convert hours to minutes?
Multiply the number of hours by 60. For example, 4 hours is 240 minutes.
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