IV Drip Rate Calculator (gtt/min & mL/hr)

Multiply the specified volume in mL by the tubing drop factor in gtt/mL, then divide by the total infusion time in minutes. Keep the unrounded value through the calculation and round only the final result to a whole drop per minute.

Sources: [3, 4]

Use the exact factor printed on the actual tubing package. Common presets are 10, 12, 15, and 20 gtt/mL for macrodrip and 60 gtt/mL for microdrip, but they do not cover every product. Other is only for entering the labeled factor, never for guessing from a diagnosis, fluid, medication, or tubing name.

Sources: [3]

Macrodrip and microdrip are broad tubing descriptions, not a way to infer an exact factor. Common macrodrip presets include 10, 12, 15, and 20 gtt/mL; 60 gtt/mL is a common microdrip preset. Always check the actual product label.

Sources: [3]

Gravity drops are counted as whole drops. The calculator keeps the raw rate through the arithmetic and rounds only the final gtt/min display to the nearest whole drop. Confirm whether the applicable institution or clinical policy specifies a different convention.

Sources: [2, 4]

Enter 30 minutes as 0 hours and 30 minutes. Enter 2.5 hours as 2 hours and 30 minutes. The calculator converts the combined time to total minutes and does not accept fractional hours or fractional minutes.

mL/hr is the mathematical flow rate for the same volume and duration, while gtt/min is a whole-drop gravity rate. A displayed mL/hr value is not an automatically approved pump setting and does not replace device instructions, drug-library safeguards, or required verification.

Sources: [2, 3]

No. It converts an already specified volume, time, and tubing factor into gravity gtt/min and mathematical mL/hr. It does not calculate a drug dose or concentration. The separate Maintenance Fluids Calculator estimates fluid requirements; this page does not.

Sources: [1, 3]

A positive unrounded result can be too small to express as a whole drop per minute for gravity administration. The calculator does not automatically increase it to 1 gtt/min. Verify the prescription, infusion method, tubing factor, device, and applicable institutional policy rather than treating 0 gtt/min as an ordinary gravity setting.

Sources: [2, 3]