IV Drop Factor Converter
Switch between mL/hr and gtt/min when changing tubing drop factors on gravity sets.
Understanding this tool
Why nurses use it
When IV tubing is changed, the drop factor (gtt/mL) changes. Nurses convert between mL/hr (pump rate) and gtt/min (gravity counting) to maintain the same delivery speed.
When to use it
Use when switching between macrodrip and microdrip sets or when verifying gravity flow against a previous pump rate.
Calculate
How to use this calculator
- Select conversion direction (mL/hr → gtt/min or reverse).
- Enter the known rate and correct drop factor from tubing packaging.
- Verify by counting drops for one minute.
How the calculation works
gtt/min = (mL/hr × drop factor) ÷ 60. Reverse: mL/hr = (gtt/min × 60) ÷ drop factor.
Formula used by this tool — verify units before applying at the bedside.
Worked example
Limitations & clinical notes
- Microdrip (60 gtt/mL) vs macrodrip sets must match selection.
- Pump rates should be verified independently.
References
Key sources: INS infusion 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.