Utility

Drop factor calculator

Converts mL/hr to drops/minute for gravity-drip sets without a pump. Check the drop factor printed on your IV tubing package.

Drops per minute
15drops/min
60.0 mL/hr · 15 drops/mL
Precise
15.00 drops/min
Seconds per drop
4.00 s
Formula
$$\text{drops/min} = \frac{ 60.0 \times 15 }{60} = 15.00$$

mL/hr × drops/mL ÷ 60 min/hr