IV Drip Rate Calculator

Calculate IV drip rates from volume, time, and drop factor. Get results in gtt/min for manual counting and mL/hr for pump settings.

IV Drip Rate Calculator

Volume to Infuse (mL)

Infusion Time

Hours

Minutes

Total: 60 minutes

Drop Factor (gtt/mL)

250 gtt/min

1000 mL/hr

1000 mL over 60 min | 15 gtt/mL tubing

* Rate exceeds 150 gtt/min — difficult to count manually. Consider using an IV pump for accuracy.

* Rate exceeds 999 mL/hr — verify order and clinical appropriateness.

Formula: gtt/min = (Volume x Drop Factor) / Time (min)
Calculation: (1000 x 15) / 60 = 250 gtt/min
mL/hr: (1000 / 60) x 60 = 1000 mL/hr

Reference: Standard IV drip rate formula used in EMS and nursing pharmacology education. gtt/min = (V x DF) / T. mL/hr = (V / T) x 60.

Drop Factor Guide

10 gtt/mL: Macro drip (blood sets)

15 gtt/mL: Macro drip (standard)

20 gtt/mL: Macro drip (some brands)

60 gtt/mL: Micro drip (pediatric/precise)

Always check tubing packaging for exact drop factor. Common prehospital sets are typically 10 or 15 gtt/mL.

Formula Reference

Drip Rate (gtt/min):

(Volume x Drop Factor) / Time (min)

Flow Rate (mL/hr):

(Volume / Time in min) x 60

Counting Drops:

Count drops in drip chamber for 15 seconds, multiply by 4. Adjust roller clamp to match target rate.

Safety Note

This calculator provides estimated drip rates for manual IV administration. Actual flow rates may vary based on catheter size, IV height, tubing length, and patient factors. Always verify rates against physician orders and monitor patients for signs of fluid overload or infiltration. Use an IV pump when available for precise rate control.