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Quizzes > Health & Medicine

Dosage Calculation Practice Test

Quick med math quiz with real scenarios and instant results.

Editorial: Review CompletedCreated By: Sam LaytonUpdated Aug 23, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration shows medication vials, pills, syringe, dosage chart and quiz prompt on coral background

This quiz helps you practice medication dosage calculations for tablets, injections, and IV drips. You'll see instant results and spot what to review next; for extra practice, try the paramedic-focused drug calculation quiz, sharpen accuracy with pharmacy math practice, and review safety basics in the medication safety quiz.

Convert 0.5 g to milligrams.
5000 mg
50 mg
500 mg
5 mg
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A patient is prescribed 250 mg. The tablets available are 125 mg each. How many tablets should be administered for one dose?
2 tablets
1 tablet
3 tablets
1.5 tablets
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Order: 80 mg. Supply: 20 mg/mL. What volume will you administer?
6 mL
4 mL
2 mL
3 mL
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Infuse 1000 mL over 8 hours using a 15 gtt/mL set. What is the drip rate in gtt/min?
31 gtt/min
45 gtt/min
21 gtt/min
38 gtt/min
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Infuse 750 mL over 6 hours. What pump rate should you set in mL/hr?
150 mL/hr
100 mL/hr
125 mL/hr
120 mL/hr
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Calculate BSA (Mosteller) for weight 70 kg and height 175 cm, then find a dose of 150 mg/m². Use BSA = sqrt((height(cm) x weight(kg))/3600).
BSA 1.84 m²; dose 276 mg
BSA 1.62 m²; dose 243 mg
BSA 2.02 m².; dose 303 mg
BSA 1.95 m².; dose 293 mg
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A dopamine infusion is 400 mg in 250 mL. The pump is set at 30 mL/hr. How many mg/hr are delivered?
60 mg/hr
36 mg/hr
24 mg/hr
48 mg/hr
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Heparin 25,000 units in 250 mL (100 units/mL). The order is 1200 units/hr. What mL/hr will you set?
15 mL/hr
10 mL/hr
20 mL/hr
12 mL/hr
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Nitroprusside 50 mg in 250 mL (200 mcg/mL). Target 2 mcg/kg/min for an 80 kg patient. What rate in mL/hr?
36 mL/hr
48 mL/hr
24 mL/hr
60 mL/hr
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A child (18 kg) is prescribed amoxicillin 500 mg TID. Safe range: 20 to 40 mg/kg/day. Is the order within the safe daily range?
No, it exceeds the safe range
Cannot determine without serum levels
Yes, within the safe range
No, it is below the safe range
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Norepinephrine 4 mg in 250 mL. Target 0.05 mcg/kg/min for a 92 kg patient. What pump rate in mL/hr?
15 mL/hr
17.3 mL/hr
12 mL/hr
20 mL/hr
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With a 20 gtt/mL set, infuse 750 mL over 5.5 hours. What is the drip rate in gtt/min?
34 gtt/min
52 gtt/min
41 gtt/min
45 gtt/min
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How many mL of a 10% solution are needed to prepare 250 mL of a 1% solution?
25 mL
20 mL
50 mL
10 mL
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A drug is 100 mg in 100 mL (1 mg/mL). For a 1 mg/min loading dose over 30 minutes, what pump rate in mL/hr is required during the loading phase?
45 mL/hr
60 mL/hr
30 mL/hr
90 mL/hr
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Vancomycin bag: 2 g in 250 mL (8 mg/mL). Dose: 15 mg/kg over 2 hours for an 85 kg patient. What pump rate should be set in mL/hr?
80 mL/hr
60 mL/hr
70 mL/hr
90 mL/hr
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Dobutamine 500 mg in 250 mL (2000 mcg/mL). Target 7.5 mcg/kg/min for a 75 kg patient. What pump rate in mL/hr?
16.9 mL/hr
12.5 mL/hr
20.0 mL/hr
15.0 mL/hr
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Phenytoin loading dose is 20 mg/kg for a 72 kg adult. Max infusion rate is 50 mg/min. What is the minimum infusion time?
60 minutes
29 minutes
45 minutes
20 minutes
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Aminophylline loading dose is 6 mg/kg using ideal body weight of 60 kg. Vial is 250 mg/10 mL. What volume delivers the dose?
12.0 mL
14.4 mL
16.0 mL
10.8 mL
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How much 20% solution is needed to prepare 500 mL of 12% solution when mixed with 5% solution? (Alligation)
267 mL
233 mL
300 mL
200 mL
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A 0.9% sodium chloride solution contains 0.9 g of NaCl per 100 mL of solution.
False
True
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0

Study Outcomes

  1. Calculate accurate medication dosages -

    Engage with drug dosage practice test scenarios to determine correct dosages for both standard and weight-based orders in our medication dosage quiz.

  2. Convert common measurement units -

    Apply nursing dosage calculations quiz techniques to convert between milligrams, milliliters, units, and other common drug measurement units with confidence.

  3. Apply dosage calculation formulas -

    Use percentage, ratio, and dimensional analysis methods to solve medication calculation questions in real-world clinical scenarios.

  4. Interpret prescription orders and labels -

    Analyze medication orders, labels, and abbreviations to ensure accurate understanding and proper administration.

  5. Analyze and correct dosing errors -

    Identify potential miscalculations from your scored quiz results and learn strategies to avoid common dosage computation mistakes.

  6. Evaluate personal calculation proficiency -

    Review immediate feedback from the dosage computation quiz online to pinpoint strengths and areas for improvement in your dosage calculation skills.

Cheat Sheet

  1. Dimensional Analysis Method -

    Dimensional analysis is the gold standard for dosage computation, treating units like algebraic terms to cancel out unwanted measures. For example, to give 500 mg using 250 mg tablets, set up (500 mg ÷ 250 mg) × 1 tablet = 2 tablets. This method is endorsed by many nursing schools for its clarity and error reduction (University of Michigan School of Nursing).

  2. Formula Method (D/H × V = X) -

    The formula method uses Dose ordered (D) divided by Dose on hand (H) multiplied by Vehicle volume (V) to find the amount to administer. For instance, if you need 750 mg of a suspension that comes as 250 mg/5 mL, calculate (750 ÷ 250) × 5 mL = 15 mL. Widely taught in clinical pharmacology courses, this approach is backed by the American Nurses Association for consistent drug dosing.

  3. IV Flow Rate Calculations -

    Calculating IV drip rates requires gtt/min = (Total volume [mL] × Drop factor [gtt/mL]) ÷ Time [min]. For example, 1,000 mL over 8 hours with a 15 gtt/mL set is (1,000×15)÷480 = 31 gtt/min. This formula is a staple in Mosby's Nursing Skills guidelines to ensure safe fluid administration.

  4. Pediatric Dosage with Clark's Rule -

    Clark's Rule estimates a child's dose using (Weight [lb] ÷ 150) × Adult dose, simplifying pediatric calculations. For a 30 lb child on a 200 mg adult dose: (30 ÷ 150) × 200 mg = 40 mg. This mnemonic-driven formula is validated by pediatrics literature to minimize dosing errors.

  5. "Five Rights" Mnemonic for Safe Dosing -

    Always verify the Five Rights: Right Patient, Right Drug, Right Dose, Right Route, and Right Time before administering any medication. A quick mental check - "5 Ps" (Patient, Pill, Portion, Path, Point in time) - helps reinforce safety. This practice is mandated by the National Council of State Boards of Nursing to reduce medication errors.

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