What is drop factor (gtt/mL)?

Drop factor is the number of drops per milliliter that a specific IV administration set delivers. Macro-drip sets are typically 10, 15, or 20 gtt/mL; micro-drip sets are 60 gtt/mL. This value is printed on the IV tubing packaging.

What is the formula for mL/hr?

mL/hr = Total Volume (mL) ÷ Duration (hours). For example, 500 mL over 4 hours equals 125 mL/hr.

What is the formula for drops per minute?

Drops/min = (Volume in mL × Drop Factor) ÷ (Duration in minutes). This gives the drip rate to set on a gravity infusion set.

When is drops/min used instead of mL/hr?

Drops/min is used for gravity (free-flow) IV sets that do not have an electronic pump. mL/hr is used when programming a volumetric infusion pump.

Is this calculator accurate enough for clinical use?

This tool is designed for educational and biomedical engineering reference. Always verify infusion parameters with your institution's clinical pharmacist or prescribing clinician before patient administration.

What drop factor should I use for a micro-drip set?

Micro-drip (also called mini-drip) sets deliver 60 drops per mL. They are typically used for pediatric patients or when very precise, small-volume infusions are required.

IV Pump Flow Rate Calculator

Name: IV Pump Flow Rate Calculator
Availability: InStock
Author: Nham Vu

Enter infusion volume, duration, and drop factor to instantly compute mL/hr and drops/min flow rates for IV pump programming.

Infusion Parameters

Total Volume (mL)

Duration

Hours

Minutes

Drop Factor (gtt/mL)

Pump Rate

—

mL / hr

Drip Rate

—

gtt / min

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Summary

Enter infusion volume, duration, and drop factor to instantly compute mL/hr and drops/min flow rates for IV pump programming.

How it works

Enter the total infusion volume in milliliters (mL).
Enter the infusion duration in hours and/or minutes.
Select the drop factor (gtt/mL) for the IV administration set being used.
The calculator instantly computes the flow rate in mL/hr for pump programming.
Drops per minute (gtt/min) is calculated for gravity infusion sets.
Review the summary card and copy results as needed.

Use cases

Programming volumetric IV pumps in clinical biomedical engineering.
Verifying gravity drip rates during IV set selection.
Training nursing and biomedical staff on infusion calculations.
Double-checking physician-ordered infusion rates before administration.
Calculating pediatric micro-drip infusion rates.
Converting between mL/hr and drops/min across different IV sets.
Documenting infusion parameters for equipment maintenance records.
Cross-validating pump display values against manual calculations.

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu