IV Drip Rate Calculator

Calculate infusion rates for gravity drips and pumps.

Infusion Settings:

Gravity Drip Rate

drops per minute

Pump Flow Rate

mL per hour

Calculations for Nurses Made Easy

Administering IV fluids requires precise math to ensure patient safety. Whether you are using an electronic infusion pump or manually counting drops for a gravity infusion, accuracy is key.

The Formula

To calculate the drop rate (gtts/min), use the standard formula:

                (Total Volume (mL) Ã— Drop Factor) / Time (minutes) = gtts/min

            

Key Terms

Drop Factor (gtts/mL): The number of drops it takes to make 1 mL of fluid. This is found on the packaging of the IV tubing.
- Macro-drip: Standard tubing (10, 15, or 20 gtts/mL). Used for general adult infusions.
- Micro-drip: Pediatric or precise tubing (60 gtts/mL). Used for slow rates or small doses.
Flow Rate (mL/hr): The speed at which the fluid enters the body. Most electronic pumps are programmed in mL/hr.

Example Calculation

Order: 1000 mL Normal Saline over 8 hours.
Tubing: 15 gtts/mL.

Convert hours to minutes: 8 hours Ã— 60 = 480 minutes.
Plug into formula: (1000 Ã— 15) / 480
15,000 / 480 = 31.25
Result: Round to 31 drops per minute (gtts/min).

Clinical Note: Always round gravity drip rates to the nearest whole number because you cannot count a fraction of a drop. For pumps (mL/hr), check your hospital policy on rounding (usually to the tenths place).