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 135 free, timed dosage questions — complete with answers and step-by-step rationales. Work through all twelve tests to build speed and confidence.
Dosage Calculations Practice Questions
Our original 25-item mixed practice set covering the core dosage calculations every nursing student needs to know.
IV Flow Rates
Drops per minute, mL/hr pump settings, and drop-factor calculations for IV infusions.
Pediatric & Weight-Based Dosing
mg/kg calculations, safe-dose range checks, and body-weight dosing for pediatric clients.
Heparin, Insulin & Units
High-alert unit-based math — heparin drips, insulin dosing, and weight-based bolus calculations.
Oral Meds & Unit Conversions
Tablets, oral suspensions, and metric conversions including g, mg, mcg, tsp, mL, and lb-to-kg.
Basic Dosage & Conversions
Tablets, oral liquids, and metric/household unit conversions — the foundation of safe medication math.
IV Titration (mcg/kg/min, mg/hr)
Vasoactive and sedation drips: mcg/kg/min, mcg/min and mg/hr to mL/hr, working back from the pump, and titration steps.
Reconstitution
Mixing powdered medications: diluent volume vs. final concentration, multi-strength vial tables, labeling, and doses per vial.
Safe-Dose Range
Is the prescribed dose safe? mg/kg/day vs. mg/kg/dose ranges, maximum-dose caps, unit conversions, and what to do when a dose is too high or too low.
IV Drip Rates & Infusion Times
When will the bag finish? Infusion end times, time left in a bag, counting drops on a gravity line, shift and 24-hour IV totals, and IVs that fall behind.
Pediatric BSA & Weight-Based Dosing
Body surface area with the Mosteller formula, mg/m² doses, BSA safe-dose checks, mL/kg boluses, maintenance fluid rates, and mg/kg/hr infusions for children.
Mixed Review
Every skill in the series mixed together: IM doses, heparin and insulin drips, lb-to-kg, mEq, percent solutions, g/hr infusions, pediatric liquids, gravity drips, and safe dose writing.
