IV Flow Rate Calculator
IV Drip Rate (gtt/min)
Calculate drops per minute for IV infusion
mL
hours
mL per Hour (Pump Rate)
Calculate mL/hr rate for IV pump settings
mL
hours
Infusion Time Calculator
Calculate how long an IV infusion will take
mL
mL/hr
Formula
Drip rate (gtt/min) = (Volume (mL) x Drop factor (gtt/mL)) / Time (min) | mL/hr = Total volume (mL) / Time (hours) | Infusion time (hours) = Total volume (mL) / Rate (mL/hr)
Frequently Asked Questions
What is a drop factor?
The drop factor (calibration) is the number of drops per milliliter that an IV tubing set delivers. Common values: macro drip (10, 15, or 20 gtt/mL) for larger volumes, micro drip (60 gtt/mL) for precise small-volume infusions.
How do you calculate IV drip rate?
Drip rate (gtt/min) = (Volume in mL x Drop factor in gtt/mL) / (Time in minutes). For example: 1000 mL over 8 hours with 15 gtt/mL tubing = (1000 x 15) / 480 = 31.25 = ~31 gtt/min.
When should I use micro drip vs macro drip tubing?
Micro drip (60 gtt/mL) is used for pediatric patients, precise medication infusions, and KVO (keep vein open) rates. Macro drip (10-20 gtt/mL) is used for standard adult fluid replacement and blood products.
How do I verify the drip rate?
Count the drops falling into the drip chamber for 15 seconds and multiply by 4 to get gtt/min. Compare with the calculated rate. Adjust the roller clamp as needed. Recheck periodically.
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