IV drip rate calculation:

\\text{Drip Rate (drops/min)} = \\frac{\\text{Volume (mL)} \\times \\text{Drop factor (drops/mL)}}{\\text{Time (minutes)}}

= \\frac{1000 \\text{ mL} \\times 20 \\text{ drops/mL}}{8 \\times 60 \\text{ min}}

= \\frac{20{,}000}{480} = 41.67 \\approx 42 \\text{ drops/min}

Common IV drop factors:

• Macro-drip sets: 10, 15, or 20 drops/mL
• Micro-drip sets: 60 drops/mL (used for pediatrics and precise small-volume infusions)

This is a frequently tested calculation in Charge/Head Nurse examinations. Always verify the drop factor printed on the IV administration set packaging.