IV Drip Rate Calculator (gtt/min)
Calculate drops per minute from total volume, infusion time, and drop factor (10, 15, 20, or 60 gtt/mL).
Understanding this tool
Why nurses use it
Gravity IV infusions require setting drops per minute when no pump is used. Nurses calculate gtt/min from volume, time, and the tubing drop factor so the infusion finishes on schedule.
When to use it
Use for manual (gravity) IV sets when programming mL/hr on a pump is not available. Re-count drops after starting the infusion.
Calculate
How to use this calculator
- Confirm total volume to infuse (mL) and ordered duration.
- Convert duration to minutes if needed.
- Select the drop factor printed on the IV tubing package (10, 15, 20, or 60 gtt/mL).
- Set the roller clamp and count drops for one minute to verify.
How the calculation works
gtt/min = (Volume × Drop factor) ÷ Time in minutes. The drop factor tells you how many drops equal one millilitre for that tubing.
Formula used by this tool — verify units before applying at the bedside.
Worked example
Limitations & clinical notes
- Gravity drip rates are approximate — verify with drop count.
- Pump infusions should use mL/hr programming instead.
References
Key sources: Infusion Nurses Society — Infusion therapy standards.
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Disclaimer: This calculator is for educational and bedside double-check purposes only. It does not replace institutional protocols, prescriber orders, pharmacist verification, or clinical judgment. Always follow your local policies — especially for high-risk medications, infusions, pediatrics, and critical care. If the patient is acutely unwell, escalate immediately rather than relying on any calculator output.