**Drops per minute (dpm) is a measure which can be calculated based on the time, drop factor and total volume of liquid (or) fluid. Drops per minute are commonly used to calculate the IV flow rate of given liquid. For example, burette contains a plastic dropper which gives the number of drops per ml (the drop factor). A number of different drop factors are available (determined by the length, diameter of plastic dropper). The common drop factors are 10 drops/ml (blood set), 15 drops / ml (regular set) and 60 drops / ml (microdrop).**

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### Calculator of Drops Per Minute

Volume

volume

Calibration / Drop Factor

gtts/mL

Time

Drops Per Minute

gtts/min

### Formula of Drops Per Minute:

**Drops Per Minute** = (V * f) / t

**Where,**

**V**= Volume**f**= Calibration / Drop Factor**t**= Time

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