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.

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 Time Formulas

IV Infusion Volume Formulas

Infusion time calculation

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

1000 mL/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

(250 mL×10)/(33×60 min)

The answer is 1.26 hours.

IV infusion volume calculation

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

vol.= (100 x 50)/20

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 and 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 maintenance fluid.