IV Infusion Rate

Calculate intravenous fluid administration rates in mL/hr and drops/min.

Infusion Rate
-- mL/hr
Drip Rate
-- drops/min

Looking for more details? Read our comprehensive IV Infusion Rate guide

What is IV Infusion Rate?

The IV Infusion Rate calculator helps healthcare professionals determine the precise rate at which intravenous fluids or medications should be administered. It calculates both the volumetric rate (mL/hr) for infusion pumps and the drip rate (drops/min) for gravity-assisted gravity sets.

Formulas

Rate (mL/hr) = Total Volume (mL) / Time (hours)
Drip Rate (drops/min) = (Volume (mL) × Drop Factor) / Time (minutes)

Standard Drop Factors:

  • Macrodrip sets: Typically 10, 15, or 20 drops/mL. Used for rapid fluid delivery, routine adult IV fluids, and blood products.
  • Microdrip sets: Typically 60 drops/mL. Used for precise fluid delivery, particularly in pediatric patients or for potent medications.

How to Use

Enter the total volume prescribed and the time duration. The tool computes the pump rate in mL/hour.

Case Example

Order: Give 500 mL of Lactated Ringer's over 4 hours.

Calculation: 500 mL / 4 hours = 125 mL/hr.

Interpretation: Set the IV infusion pump to 125 mL per hour.

Frequently Asked Questions

Is mL/hour different from drops/min?

Yes. Electronic IV pumps use mL/hour. Gravity-based manual IV drips require converting to drops per minute (gtt/min) based on the tubing's drop factor.

Clinical Guidance