Calcoid

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.

IV Rate Calculation Examples

The calculator converts volume and time between pump rate, gravity drip rate, and weight-based dose rate.

OrderPump rateDrop factorGravity drip rate
1,000 mL over 10 hours100 mL/hr15 gtt/mL25 gtt/min
1,000 mL over 8 hours125 mL/hr10 gtt/mL21 gtt/min
500 mL over 4 hours125 mL/hr15 gtt/mL31 gtt/min
250 mL over 2 hours125 mL/hr60 gtt/mL125 gtt/min
250 mL over 3 hours83.3 mL/hr60 gtt/mL83 gtt/min

For education only. Verify every IV order, concentration, pump setting, and drop factor under your institution's medication-safety process.

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.

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