Calculator Inputs
Example Data Table
| Scenario | Weight | Ordered Dose | Concentration | Time | Bolus Volume | Rate | mL/hr Equivalent |
|---|---|---|---|---|---|---|---|
| Adult example | 70 kg | 100 mg | 10 mg/mL | 5 min | 10 mL | 20 mg/min | 120 mL/hr |
| Pediatric example | 20 kg | 20 mg | 2 mg/mL | 4 min | 10 mL | 5 mg/min | 150 mL/hr |
| Diluted syringe | 85 kg | 50 mg | 5 mg/mL | 3 min | 10 mL | 16.67 mg/min | 200 mL/hr |
| Microdose example | 60 kg | 500 mcg | 100 mcg/mL | 2 min | 5 mL | 0.25 mg/min | 150 mL/hr |
Formula Used
1) Working concentration
Concentration (mg/mL) = Prepared drug amount (mg) ÷ Final syringe volume (mL)
2) Bolus volume
Bolus volume (mL) = Ordered dose (mg) ÷ Concentration (mg/mL)
3) Administration rate
Rate (mg/min) = Ordered dose (mg) ÷ Administration time (min)
Rate (mL/min) = Bolus volume (mL) ÷ Administration time (min)
4) Hourly equivalent
mL/hr = mL/min × 60
5) Weight-based outputs
Dose (mg/kg) = Ordered dose (mg) ÷ Patient weight (kg)
Rate (mg/kg/min) = Rate (mg/min) ÷ Patient weight (kg)
6) Rounding check
Rounded volume = Round(Bolus volume ÷ Increment) × Increment
Deviation % = ((Rounded delivered dose − Ordered dose) ÷ Ordered dose) × 100
How to Use This Calculator
- Enter the ordered dose and select the matching unit.
- Add patient weight if you want mg/kg and mg/kg/min outputs.
- Enter a direct concentration, or enter prepared amount with final syringe volume.
- Enter the planned administration time and select seconds, minutes, or hours.
- Optionally add a maximum allowed rate, weight-based rate, rounding increment, and push aliquot size.
- Click the calculate button to display results above the form.
- Review the chart, interpretation, and optional safety checks.
- Use the CSV or PDF buttons to export the calculated summary.
FAQs
1) What does this IV bolus rate calculator estimate?
It estimates the working concentration, total volume to administer, rate in mg/min, rate in mL/min, hourly equivalent, and optional weight-based and rounding outputs.
2) Can I use either direct concentration or dilution details?
Yes. You may enter a direct concentration, or provide the prepared drug amount and final syringe volume. If both are entered, the direct concentration is used.
3) Why is patient weight optional?
Patient weight is only required when you want dose-per-kilogram and rate-per-kilogram outputs. Basic bolus volume and rate calculations do not require weight.
4) What is the purpose of the rate-limit fields?
They provide user-entered comparison checks against the calculated rate. They are convenience fields only and must not replace approved drug references or local policy.
5) Why does the calculator show an hourly equivalent?
mL/hr is a familiar reference value for many clinicians and educators. It helps compare a brief bolus with pump-based thinking, even though an IV bolus is usually given manually.
6) What does the rounding section help with?
It estimates the rounded deliverable volume and shows how much the delivered dose may differ from the ordered dose after rounding to a chosen syringe increment.
7) What does the aliquot section mean?
If you enter a push aliquot size, the calculator estimates how many aliquots are needed, the approximate dose per full aliquot, and the average spacing between aliquots.
8) Is this calculator suitable for direct clinical decisions alone?
No. It is a calculation aid for review, teaching, and documentation support. Always verify the medication order, patient condition, and approved administration guidance before use.