Metric mass conversion (mcg, mg, g) practice problems
Work each problem on paper first, rounding as the question says. Then open the answer to check it and see every step.
For study and exam practice, not for patient care. The orders in these problems are written for practice. In the clinic, follow the prescriber's order, your facility's protocols, and your pharmacy.
Problem 1
Order: captopril 150 mg PO. How many g is this dose? Record your answer using 2 decimal places.
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Answer: 0.15 g
- 1 g = 1,000 mg, so divide by 1,000.
- 150 ÷ 1,000 = 0.15 g.
- 0.15 g is exact, so no rounding is needed.
Problem 2
The client is in the recovery unit after surgery and reports moderate postoperative pain. The nurse reviews the order: fentanyl citrate 100 mcg IM. How many mg is this dose? Record your answer using 1 decimal place.
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Answer: 0.1 mg
- 1 mg = 1,000 mcg, so divide by 1,000.
- 100 ÷ 1,000 = 0.1 mg.
- 0.1 mg is exact, so no rounding is needed.
Problem 3
Order: oxacillin 250 mg IM. How many g is this dose? Record your answer using 2 decimal places.
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Answer: 0.25 g
- 1 g = 1,000 mg, so divide by 1,000.
- 250 ÷ 1,000 = 0.25 g.
- 0.25 g is exact, so no rounding is needed.
Problem 4
A client with a community-acquired pneumonia is receiving intravenous therapy. The prescription reads: azithromycin 500 mg IV. How many g is this dose? Record your answer using 1 decimal place.
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Answer: 0.5 g
- 1 g = 1,000 mg, so divide by 1,000.
- 500 ÷ 1,000 = 0.5 g.
- 0.5 g is exact, so no rounding is needed.
Problem 5
The nurse is caring for a client who has a prescription for desmopressin acetate 0.05 mg PO. The nurse is converting this dose for the medication record. How many mcg is this dose? Record your answer using a whole number.
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Answer: 50 mcg
- 1 mg = 1,000 mcg, so multiply by 1,000.
- 0.05 × 1,000 = 50 mcg.
- 50 mcg is exact, so no rounding is needed.
Problem 6
The nurse is caring for a client in the postanesthesia care unit who reports severe pain after surgery. The prescription reads: fentanyl citrate 25 mcg IM. How many mg is this dose? Record your answer using 3 decimal places.
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Answer: 0.025 mg
- 1 mg = 1,000 mcg, so divide by 1,000.
- 25 ÷ 1,000 = 0.025 mg.
- 0.025 mg is exact, so no rounding is needed.
Problem 7
A client with a ventricular dysrhythmia is receiving treatment in the cardiac unit. The prescription reads: amiodarone 150 mg IV. How many g is this dose? Record your answer using 2 decimal places.
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Answer: 0.15 g
- 1 g = 1,000 mg, so divide by 1,000.
- 150 ÷ 1,000 = 0.15 g.
- 0.15 g is exact, so no rounding is needed.
Problem 8
Order: ciprofloxacin 400 mg IV. How many g is this dose? Record your answer using 1 decimal place.
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Answer: 0.4 g
- 1 g = 1,000 mg, so divide by 1,000.
- 400 ÷ 1,000 = 0.4 g.
- 0.4 g is exact, so no rounding is needed.
Problem 9
Order: ciprofloxacin 200 mg IV. How many g is this dose? Record your answer using 1 decimal place.
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Answer: 0.2 g
- 1 g = 1,000 mg, so divide by 1,000.
- 200 ÷ 1,000 = 0.2 g.
- 0.2 g is exact, so no rounding is needed.
Problem 10
The nurse is caring for a client who has a prescription for fluconazole 200 mg IV. The nurse needs to convert this dose to grams before documenting the order. How many g is this dose? Record your answer using 1 decimal place.
Show answer and steps
Answer: 0.2 g
- 1 g = 1,000 mg, so divide by 1,000.
- 200 ÷ 1,000 = 0.2 g.
- 0.2 g is exact, so no rounding is needed.
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