mcg/kg/min Infusion Rate Calculator
Convert weight-based vasopressor and inotrope orders (mcg/kg/min) to mL/hr using drug concentration.
Understanding this tool
Why nurses use it
Vasopressors and inotropes (norepinephrine, epinephrine, dopamine, dobutamine) are often ordered in mcg/kg/min. Nurses must convert that order into mL/hr using the concentration of the prepared syringe or bag.
When to use it
Use in ICU, emergency, or critical care when verifying pump rates for weight-based infusions. Always follow your unit’s standard concentration and protocol.
Calculate
How to use this calculator
- Confirm the ordered mcg/kg/min and patient weight.
- Verify the drug concentration (mcg/mL) on the prepared infusion — must match what is actually hanging.
- Calculate mL/hr and cross-check with a colleague or pump library.
- Monitor haemodynamics and titrate per protocol, not calculator output alone.
How the calculation works
mL/hr = (mcg/kg/min × weight kg × 60 min) ÷ concentration mcg/mL. The ×60 converts per-minute dose to per-hour volume.
Formula used by this tool — verify units before applying at the bedside.
Worked example
Limitations & clinical notes
- Concentration must match the bag/syringe you prepared.
- Vasopressor infusions require pump validation and protocol compliance.
References
Key sources: SCCM — Hemodynamic support guidelines.
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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.