Drip Rate Calculator: mL/hr to gtt/min
Enter the rate set on the IV order or pump.
Drop factor is printed on your IV tubing packaging.
Results are approximate. Always verify against medical order and local protocols.
Written by George Lambroglou, RN • Last reviewed 21 Jun 2026
Convert an IV infusion rate in mL/hr into a gravity drip rate in drops per minute (gtt/min). Enter the rate and select your giving set drop factor.
Formula
gtt/min = (mL/hr ÷ 60) × drop factor
Worked Example
Order: 120 mL/hr. Drop factor: 20 gtt/mL. What is the drip rate?
mL/min = 120 ÷ 60 = 2 mL/min
gtt/min = 2 × 20 = 40 gtt/min
gtt/min = 2 × 20 = 40 gtt/min
Answer: 40 gtt/min
Safety note: Always confirm the drop factor printed on your giving set, the IV order, and local protocol before adjusting a gravity infusion.