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IV Drip Rate Calculator

Calculate IV pump rate (mL/hr) and gravity drip rate (gtt/min) from volume, time, and drop factor.

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Version 1.0.0 · Last reviewed

Tool

From the IV tubing package.

Result

Live output from your inputs

Enter values and calculate to see results.

How it worksShow guide

Introduction

Calculate IV infusion rate in mL/hr and drops per minute from total volume, time, and tubing drop factor (macro/micro drip).

Disclaimer: This tool is for informational purposes only and is not professional medical, pharmaceutical, financial, or tax advice. Always verify doses with a licensed clinician or pharmacist.

Formula

Pump rate is volume divided by hours. Manual drip rate multiplies volume by drop factor and divides by minutes.

mL/hr=Vt,gtt/min=V×DFt×60\mathrm{mL/hr} = \frac{V}{t},\quad \mathrm{gtt/min} = \frac{V \times DF}{t \times 60}
  • V — Total volume (mL)
  • t — Infusion time (hours)
  • DF — Drop factor (gtt/mL)

Step-by-step

  1. Enter the total IV volume in milliliters.
  2. Enter the infusion duration in hours.
  3. Enter the tubing drop factor (e.g. 10, 15, 20, or 60 gtt/mL).

Worked example

1,000 mL over 8 hours is 125 mL/hr. With a 15 gtt/mL set that is about 31 gtt/min.

Use cases

  • Set an IV pump rate in mL/hr
  • Estimate gravity drip rate in gtt/min
  • Teach IV flow-rate pharmacy math

Frequently asked questions

What drop factor should I use?

Read the IV set package. Common macro sets are 10–20 gtt/mL; microdrip is typically 60 gtt/mL.

Does this include drug additives?

It only solves flow math for the bag volume and time you enter. Verify compatibility and dosing separately.

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Version 1.0.0 · Last updated: