Infusion Drip Rate
Enter the total infusion volume and desired duration to calculate the intravenous drip rate in millilitres per hour and per minute.
Specify additional minutes beyond whole hours.
Infusion rate
125.0 mL/hr
Infusion rate (per minute)
2.08 mL/min
How to Use This Calculator
Identify infusion volume
Use the total fluid volume to be infused, such as a 1000 mL normal saline bag.
Set the desired infusion time
Enter hours and minutes. A 90 minute infusion equals 1 hour and 30 minutes.
Use the calculated rate
Program infusion pumps with the mL/hr figure. For gravity sets, convert mL/min to drops per minute using the tubing drop factor.
Formula
Volume per minute = Total volume (mL) / Total time (minutes)
Volume per hour = Volume per minute * 60
Drop rate (gtt/min) = (mL per minute * drop factor) / 1 mL.
Full Description
Accurate drip rate calculations prevent under infusion and over infusion. Converting orders into mL/hr simplifies pump programming. When gravity tubing is used, convert the result to drops per minute based on the tubing drop factor. Confirm fluid orders, patient status, and local protocols before starting the infusion.
Frequently Asked Questions
How do I convert to drops per minute?
Multiply mL per minute by the tubing drop factor. The drops-per-minute calculator can assist with this conversion.
What if the infusion time is provided in minutes only?
Enter the minutes and leave hours set to zero. The calculator handles the conversion to total minutes.
Can I adjust for patient weight?
This page focuses on volume and time. Use a weight based dosing calculator when orders are written per kilogram per hour.
Why does accuracy matter?
Incorrect drip rates can cause fluid overload, inadequate resuscitation, or medication dosing errors. Always double check calculations and pump settings.