Oral medications and unit conversions are everyday nursing skills — and they show up constantly on the NCLEX. This free Dosage Calculations Practice Test #5 covers tablets, oral liquids, and metric/household conversions (g, mg, mcg, tsp, mL, and lb-to-kg). Work through 10 timed questions, then check every calculation using the full answer key and step-by-step rationales below. No sign-up required.
All 10 Questions With Answers & Rationales
Prefer to work at your own pace? Every question from the timed quiz above is listed here in full. Solve each on paper, then tap Show Answer & Rationale to check your work.
Question 1: Tablets
A provider orders 0.5 g of a medication. The tablets are 250 mg each. How many tablets should the nurse give? (1 g = 1,000 mg)
- A. 1 tablet
- B. 2 tablets
- C. 0.5 tablet
- D. 4 tablets
Show Answer & Rationale
Answer: B. 2 tablets
Rationale: Convert: 0.5 g = 500 mg. Tablets = 500 mg ÷ 250 mg = 2 tablets.
Question 2: Liquid
An order reads 750 mg of an oral suspension labeled 250 mg/5 mL. How many mL should the nurse give?
- A. 10 mL
- B. 15 mL
- C. 5 mL
- D. 7.5 mL
Show Answer & Rationale
Answer: B. 15 mL
Rationale: (750 mg ÷ 250 mg) × 5 mL = 3 × 5 = 15 mL.
Question 3: Conversion
A client is ordered 1,500 mcg of a drug. The tablets are 0.5 mg each. How many tablets are needed? (1 mg = 1,000 mcg)
- A. 3 tablets
- B. 1.5 tablets
- C. 0.3 tablet
- D. 30 tablets
Show Answer & Rationale
Answer: A. 3 tablets
Rationale: Convert mcg to mg: 1,500 mcg ÷ 1,000 = 1.5 mg. Tablets = 1.5 mg ÷ 0.5 mg = 3 tablets.
Question 4: Tablets
A provider orders 75 mg of a medication supplied as 25 mg tablets. How many tablets should the nurse administer?
- A. 2 tablets
- B. 3 tablets
- C. 1.5 tablets
- D. 4 tablets
Show Answer & Rationale
Answer: B. 3 tablets
Rationale: Tablets = 75 mg ÷ 25 mg = 3 tablets.
Question 5: Liquid
A client needs 60 mg of a liquid medication available as 20 mg/mL. How many mL should the nurse give?
- A. 2 mL
- B. 3 mL
- C. 4 mL
- D. 1.5 mL
Show Answer & Rationale
Answer: B. 3 mL
Rationale: (60 mg ÷ 20 mg) × 1 mL = 3 mL.
Question 6: Conversion
An order is written for 2 tsp of an oral solution. How many mL should the nurse document? (1 tsp = 5 mL)
- A. 5 mL
- B. 10 mL
- C. 15 mL
- D. 2 mL
Show Answer & Rationale
Answer: B. 10 mL
Rationale: 2 tsp × 5 mL/tsp = 10 mL.
Question 7: Tablets
A provider orders 0.125 mg of digoxin. The available tablets are 0.25 mg. How many tablets should the nurse give?
- A. Half a tablet
- B. 1 tablet
- C. 2 tablets
- D. Quarter of a tablet
Show Answer & Rationale
Answer: A. Half a tablet
Rationale: Tablets = 0.125 mg ÷ 0.25 mg = 0.5, so give one-half of a scored tablet.
Question 8: Conversion
A client is to receive 1 g of a medication. The oral solution is 500 mg/10 mL. How many mL should the nurse give? (1 g = 1,000 mg)
- A. 10 mL
- B. 20 mL
- C. 5 mL
- D. 15 mL
Show Answer & Rationale
Answer: B. 20 mL
Rationale: Convert: 1 g = 1,000 mg. (1,000 mg ÷ 500 mg) × 10 mL = 2 × 10 = 20 mL.
Question 9: Tablets
An order reads 300 mg of a medication. On hand are 100 mg tablets. How many tablets are needed?
- A. 2 tablets
- B. 3 tablets
- C. 1 tablet
- D. 4 tablets
Show Answer & Rationale
Answer: B. 3 tablets
Rationale: Tablets = 300 mg ÷ 100 mg = 3 tablets.
Question 10: Conversion
A client weighs 165 lb. What is the weight in kg (round to the nearest tenth)? (1 kg = 2.2 lb)
- A. 75 kg
- B. 72.6 kg
- C. 363 kg
- D. 82.5 kg
Show Answer & Rationale
Answer: A. 75 kg
Rationale: 165 lb ÷ 2.2 = 75 kg.
NCLEX Dosage Calculation Practice Tests
Master the medication math that shows up most on the NCLEX with 75 free, timed dosage questions — complete with answers and step-by-step rationales. Work through all six tests to build speed and confidence.
Dosage Calculations Practice Questions
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