Calculate the correct IV drip rate for fluid administration. Enter the total volume to infuse, the infusion time, and the drop factor (drip set calibration) — and get back the drops per minute (gtt/min) and mL per hour your IV line should be set to deliver.
Drip Rate
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Flow Rate
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Total Infusion Time
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Drops Per Second
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The IV drip rate is the speed at which intravenous fluid is delivered to a patient, expressed in drops per minute (gtt/min) or millilitres per hour (mL/hr). Getting it right is critical — too fast can cause fluid overload, while too slow may delay therapeutic effect or fail to meet the patient's fluid needs.
The drop factor is the number of drops the IV tubing produces per millilitre of fluid. It is determined by the design of the drip chamber and is printed on the IV set packaging. Standard macro-drip sets are commonly 10, 15, or 20 gtt/mL, while micro-drip sets (used for pediatric patients or precise dosing) are typically 60 gtt/mL.
The standard formula is: Drip Rate (gtt/min) = [Volume (mL) × Drop Factor (gtt/mL)] ÷ Time (minutes). For mL/hr, simply divide the total volume by the number of hours: Flow Rate (mL/hr) = Volume (mL) ÷ Time (hours).
Micro-drip sets are used when precise fluid control is required — most commonly in pediatric patients, neonates, or when administering concentrated medications that require slow, controlled delivery. The 60 gtt/mL factor makes manual counting easier because gtt/min numerically equals mL/hr.
This calculator can estimate a drip rate for blood administration. Blood tubing typically uses a 10 gtt/mL drop factor. However, blood transfusion rates are governed by clinical protocols, patient condition, and nursing assessment — always follow your institution's specific guidelines.
Flow rate (mL/hr) is used for electronic infusion pumps that measure volume over time. Drip rate (gtt/min) is used when manually regulating gravity IV lines by counting drops in the drip chamber. Both describe the same infusion speed in different units — the drop factor bridges the two.
Use a watch with a second hand and count the number of drops falling in the drip chamber over 15 seconds, then multiply by 4 to get gtt/min. Adjust the roller clamp to speed up or slow down the flow until you reach the target drip rate calculated for your patient.
This tool is intended as an educational and verification aid for healthcare professionals. All IV therapy decisions should be verified against the prescriber's order, your institution's protocols, and independent clinical judgment. Never rely solely on any online calculator for direct patient care.