Infusion Duration

Calculate time remaining for an IV infusion.

Calculation practice

Learn infusion duration

Find how long the remaining volume will infuse at the current pump rate.

01CalculateEnter the values from the problem.
02ReviewFollow the units through one example.
03PracticeCreate a worksheet for the same skill.

Formula

Keep the units in the setup. Cancel them before you accept the answer.

Time in hours

Worked example

A bag has 500 mL remaining. The pump rate is 125 mL/hr. Find the time remaining.

1500 mL ÷ 125 mL/hr = 4 hours
2The mL units cancel. The remaining unit is hours.

Answer: 4 hours

Checks before use

Use the volume that remains in the bag, not the original bag volume.
Confirm that the pump rate is in mL/hr.
Recalculate after a rate change, pause, or line interruption.

Practice this skill

Create a printable infusion-time worksheet with worked solutions.

Create worksheet

References

Pharmacy Calculations: IV Rate — StatPearls, NCBI Bookshelf
Chapter 23: IV Therapy Management — Open RN, NCBI Bookshelf

Site editor: Daniel Tran, PharmD. Educational use only. Verify the order, current drug reference, prepared product, and facility policy before clinical use.

For educational use only. Always verify with clinical judgment and facility protocols.