# How do you calculate GTTS per minute?

Category:
science
physics

To

**calculate**the drops**per minute**, the drop factor is needed. The formula for**calculating**the IV flow rate (drip rate) is… total volume (in mL) divided by time (in**min**), multiplied**by the**drop factor (in**gtts**/mL), which equals the IV flow rate in**gtts**/**min**.

Considering this, how do I calculate flow rate?

The **flow rate** formula, in general, is Q = A × v, where Q is the **flow rate**, A is the cross-sectional area at a point in the path of the **flow** and v is the velocity of the liquid at that point.

**Drip Rates**— is when the

**infusion**volume is calculated into drops. The

**formula**for the

**Drip Rate**:

**Drip Rate**= Volume (mL) Time (h) . A patient is ordered to receive 1 000 mL of intravenous fluids to run over 8 hours.

Consequently, how many drops is 100 mL per hour?

Reference Chart of Drops per Minute

IV Tubing Drop Factor | Desired Hourly Rate: ML / HR | |

20 | 100 | |
---|---|---|

10 DROP/ML | 3 | 16 |

15 DROP/ML | 5 | 25 |

20 DROP/ML | 6 | 32 |

There are a number of different drip factors available in clinical practice, however the commonest are: **10 drops** per ml (blood set). 15 drops per ml (regular set). 60 drops per ml (burette, microdrop).