Calculator — infusion time
Infusion time calculator
Work out how long an infusion takes and when it will finish.
Short answer: Infusion time (hours) = volume (ml) ÷ rate (ml/h). 500 ml at 125 ml/h takes 4 hours.
Infusion time calculator
Enter the volume and rate. Add a start time to see the finish time.
Calculate infusion time
The formula
Time (h) = Volume (ml) ÷ Rate (ml/h)
Example: 750 ml at 250 ml/h. 750 ÷ 250 = 3 hours. Starting at 14:30, the infusion finishes at 17:30.
Need the rate instead? See infusion rate. More on clock times is in daily dose and timing.
Frequently asked questions
How do you calculate infusion time?+
Divide the volume in ml by the rate in ml/h. The answer is in hours.
How do I convert decimal hours to minutes?+
Multiply the decimal part by 60. 2.5 hours is 2 hours 30 minutes.
How do I work out the finish time?+
Add the duration to the start time. 14:30 plus 3 hours is 17:30.
Practise infusions in Dos
Dos is a practice app for drug calculations. It has practice tests of ten questions, a built-in calculator next to each question, and statistics per topic.
