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MedTestBankDosage Calculation for Nursing

IV infusion time practice problems

Dosage calculation practice for nursing students: solve unlimited new problems below with instant checking, or work through the 15 problems with answers further down.

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Formula to use

Time (hr) = volume (mL) ÷ rate (mL/hr)

Minutes = decimal part of the hours × 60

Open the iv infusion time calculator to check your own numbers step by step.

15 practice problems with answers

Solve each problem on paper first, then open the answer to compare every step.

  1. 400 mL of lactated Ringer's is infusing at 50 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 400 mL ÷ 50 mL/hr = 8 hr.
    2. That is 8 hr.

    Answer: 8 hr

  2. 1,000 mL of lactated Ringer's is infusing at 125 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 1,000 mL ÷ 125 mL/hr = 8 hr.
    2. That is 8 hr.

    Answer: 8 hr

  3. 960 mL of D5 0.45% sodium chloride is infusing at 80 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 960 mL ÷ 80 mL/hr = 12 hr.
    2. That is 12 hr.

    Answer: 12 hr

  4. 600 mL of lactated Ringer's is infusing at 75 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 600 mL ÷ 75 mL/hr = 8 hr.
    2. That is 8 hr.

    Answer: 8 hr

  5. 400 mL of lactated Ringer's is infusing at 100 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 400 mL ÷ 100 mL/hr = 4 hr.
    2. That is 4 hr.

    Answer: 4 hr

  6. 125 mL of lactated Ringer's is infusing at 50 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 125 mL ÷ 50 mL/hr = 2.5 hr.
    2. That is 2 hr 30 min.

    Answer: 2.5 hr

  7. 1,000 mL of lactated Ringer's is infusing at 250 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 1,000 mL ÷ 250 mL/hr = 4 hr.
    2. That is 4 hr.

    Answer: 4 hr

  8. 600 mL of D5W is infusing at 150 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 600 mL ÷ 150 mL/hr = 4 hr.
    2. That is 4 hr.

    Answer: 4 hr

  9. 1,000 mL of D5W is infusing at 100 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 1,000 mL ÷ 100 mL/hr = 10 hr.
    2. That is 10 hr.

    Answer: 10 hr

  10. 300 mL of 0.9% sodium chloride is infusing at 150 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 300 mL ÷ 150 mL/hr = 2 hr.
    2. That is 2 hr.

    Answer: 2 hr

  11. 300 mL of D5 0.45% sodium chloride is infusing at 50 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 300 mL ÷ 50 mL/hr = 6 hr.
    2. That is 6 hr.

    Answer: 6 hr

  12. 640 mL of D5W is infusing at 80 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 640 mL ÷ 80 mL/hr = 8 hr.
    2. That is 8 hr.

    Answer: 8 hr

  13. 800 mL of D5 0.45% sodium chloride is infusing at 100 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 800 mL ÷ 100 mL/hr = 8 hr.
    2. That is 8 hr.

    Answer: 8 hr

  14. 500 mL of D5 0.45% sodium chloride is infusing at 50 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 500 mL ÷ 50 mL/hr = 10 hr.
    2. That is 10 hr.

    Answer: 10 hr

  15. 250 mL of lactated Ringer's is infusing at 125 mL/hr. How many hours will it take? Answer in hours (for example 2.5).

    Show the answer
    1. Time = volume ÷ rate = 250 mL ÷ 125 mL/hr = 2 hr.
    2. That is 2 hr.

    Answer: 2 hr