IV Infusion Time & Volume Calculator
IV infusion time & volume calculator allows you to calculate total infusion time & volume, remaining infusion time & volume of a given infusion rate.
Infusion Time Calculator
This Infusion Time calculator helps to determine the correct time needed to administer the given volume — based on the volume and infusion rate.
IV Infusion Time Formula
With IV Pump
Infusion Time (hr) = Volume (ml) / Flow rate (ml/hr)
Without IV Pump
Infusion Time (hr) = [{Volume (ml) / Flow rate (gtts/min)} x Drop Factor] x 60 (to convert min into hr
Infusion Time Calculations
Example 1:
Using a volumetric IV pump calculate to duration of 1000 milliliters (mL) of normal saline infusing at 125 milliliters/hour (mL/hr).
- Volume = 1000 mL
- Rate = 125 mL
The answer is 8 hours.
Example 2:
There are 250 mL of D5W infusing at 33 (gtt/min) on IV tubing calibrated at 10 drops/milliliter (gtt/mL). Calculate the infusion time.
- Volume = 250 mL
- IV tubing calibration = 10 gtt/mL
- gtt/min = 33 gtt/min
The answer is 1.26 hours.
Infusion Volume Calculator
This IV infusion volume calculator helps to determine the correct volume needed to administer in given time — based on the time and infusion rate.
IV Infusion Volume Formula
With IV Pump
Infusion Volume (ml) = Time (hr) / Flow rate (ml/hr)
Without IV Pump
Infusion Volume (ml) = {Time (min) / Flow rate (gtts/min)} x Drop Factor
Infusion Volume Calculations
Example 1:
There are ? mL of D5W infusing at 50 (gtt/min) on IV tubing calibrated at 15 drops/milliliter (gtt/mL) in 1hr 40 minutes.
- Time = 60+40 =100min
- IV tubing calibration = 20 gtt/mL
- gtt/min = 50 gtt/min
The answer is 500 ml.
General Tips
- Check that your answer makes sense clinically.
- Triple check your work.
- Have a colleague or pharmacist check your work.
- Know general therapeutic drug doses for commonly administered medications.
Drop Factor
Drop factor is the number of drops it takes to equal 1 ml with a specific type of IV
tubing.
The drop factor is stated on the tubing package.
Macrodrip: 10, 15 and 20 gtts/minute
Microdrip: 60 gtts/minute
How to use IV infusion time & volume Calculator
- Select what you want to find out time or volume.
- Tick IV Pump or No IV Pump.
- Enter infusion flow rate & total fluid volume
- Click on calculate to find out
Infusion time or volume
Note: In case of no IV Pump you need to select drop factor (IV tubing calibration usally mentioned on IV set)
Click here to calculate IV Drip Rate
