Infusion Time Calculator (mL/hr to hh:mm)
Calculate how long an IV infusion will take to finish when you know the volume (mL) and infusion rate (mL/hr).
Calculator
How it Works
This calculator estimates how long an infusion will take to finish when you know the total volume (mL) and the infusion rate (mL/hr). It divides volume by rate to get hours, and also displays an hours-and-minutes format for practical planning.
Formula
Worked Examples
Example 1: 500 mL at 100 mL/hr
Volume = 500 mL, Rate = 100 mL/hr
Time = 500 ÷ 100 = 5.00 hours
5.00 hours = 5h 0m
Example 2: 1000 mL at 250 mL/hr
Volume = 1000 mL, Rate = 250 mL/hr
Time = 1000 ÷ 250 = 4.00 hours
4.00 hours = 4h 0m
Example 3: 120 mL at 80 mL/hr
Volume = 120 mL, Rate = 80 mL/hr
Time = 120 ÷ 80 = 1.50 hours
1.50 hours = 1h 30m
When This Calculator Is Used
- •Planning shift timing for IV infusions
- •Informing patients of expected infusion duration
- •Scheduling medication administration appointments
- •Monitoring infusion progress and estimating completion
- •Coordinating with nursing handover between shifts
Clinical safety note: This is an estimate based on the programmed rate. Actual infusion times vary due to line resistance, positional changes, and gravity effects. Always monitor the IV site and adjust as needed.
Related Calculators
Frequently Asked Questions
Clinical reminder: Always follow local protocols and consult medication information sheets. These examples are for calculation practice only.
References & Sources
This calculator is based on established IV therapy and infusion rate standards from authoritative medical and educational sources.