Health
IV Drip Rate Calculator
Calculate IV drip rates (gtt/min), pump rates (mL/hr), and weight-based drug doses (mcg/kg/min, mg/hr). For nursing and pharmacy students.
IV infusion details
Read the drop factor from the tubing package. Standard sets are 10, 15, or 20 gtt/mL for macro and 60 gtt/mL for micro.
Gravity drip rate
31 gtt/min
- Pump-equivalent rate
- 125 mL/hr
- Total time
- 480 min
- Drop factor
- 15 gtt/mL
For education only
This calculator is a study and double-check aid, not a replacement for clinical judgment, the medication order, or your facility's protocols. Always confirm any infusion rate or dose with a clinical pharmacist (or a second licensed nurse) before programming a pump or starting a gravity infusion. Do not use this tool for real patient care without independent verification.
Frequently Asked Questions about the IV Drip Rate Calculator
How do I calculate drops per minute for a gravity IV?
Multiply the total volume in mL by the drop factor printed on the tubing, then divide by the total infusion time in minutes. For example, 1000 mL over 8 hours (480 minutes) with a 15 gtt/mL set works out to 31 gtt/min.
What drop factor should I use, 10, 15, 20, or 60?
Macro tubing typically runs at 10, 15, or 20 gtt/mL and is used for routine fluids. Micro tubing runs at 60 gtt/mL and is used for pediatric or small-volume infusions where precise control matters. Always read the value from the tubing package before you set the rate.
How is mL/hr different from gtt/min?
mL/hr is the volume per hour an infusion pump delivers. gtt/min is the drops per minute you count on a gravity drip chamber. Convert between them with the drop factor: gtt/min equals mL/hr times drop factor divided by 60.
How do I calculate a weight-based dose like mcg/kg/min?
First find the drug concentration in mcg/mL (drug mass divided by bag volume). Then use mL/hr equals dose times weight in kg times 60, divided by concentration in mcg/mL. For dopamine 400 mg in 250 mL at 5 mcg/kg/min for a 70 kg patient, that gives 13.125 mL/hr.
Can I use this calculator for real patient care?
No. This tool is for education and study only. Always verify any infusion rate, dose, or concentration with a clinical pharmacist and follow your facility's medication-administration policy before programming a pump or starting an infusion.