ATI Dosage Calculation 2026/2027 | ACTUAL-Style
Practice Questions & Answers, ATI RN Dosage
Calculation Exam Prep, Nursing Math Test Bank,
Medication Dosage Calculations, IV Flow Rates, Pump
Rates, Weight-Based Dosing, Dimensional Analysis,
Pediatric Dosages, Safe Medication Administration,
and Detailed Rationales
Question 1: A client is prescribed 500 mg of a medication. The
pharmacy supplies the medication in 250 mg tablets. How many
tablets should the nurse administer?
A. 0.5 tablet
B. 1 tablet
C. 2 tablets
D. 3 tablets
CORRECT ANSWER: C. 2 tablets
Rationale: To determine the number of tablets, divide the prescribed dose
by the available dose: 500 mg ÷ 250 mg = 2 tablets.
Question 2: A provider orders 1,000 mL of IV fluid to infuse over 8 hours.
The nurse should set the IV pump to deliver how many mL/hr?
A. 100 mL/hr
B. 125 mL/hr
C. 150 mL/hr
D. 200 mL/hr
CORRECT ANSWER: B. 125 mL/hr
Rationale: Divide the total volume by the total time in hours: 1,000 mL ÷ 8
hours = 125 mL/hr.
Question 3: A client is prescribed 0.5 g of an antibiotic. The medication
is available as 250 mg capsules. How many capsules should the nurse
administer?
A. 1 capsule
B. 2 capsules
C. 3 capsules
D. 4 capsules
CORRECT ANSWER: B. 2 capsules
,Rationale: First convert grams to milligrams: 0.5 g = 500 mg. Then divide the
prescribed dose by the available dose: 500 mg ÷ 250 mg = 2 capsules.
Question 4: A client weighs 154 lb. The provider orders a medication at
5 mg/kg/day. What is the client's weight in kilograms?
A. 60 kg
B. 65 kg
C. 70 kg
D. 75 kg
CORRECT ANSWER: C. 70 kg
Rationale: To convert pounds to kilograms, divide by 2.2: 154 lb ÷ 2.2 = 70
kg.
Question 5: A client is prescribed 750 mg of a medication. The
pharmacy provides a suspension labeled 250 mg/5 mL. How many mL
should the nurse administer?
A. 5 mL
B. 10 mL
C. 15 mL
D. 20 mL
CORRECT ANSWER: C. 15 mL
Rationale: Using ratio and proportion: (250 mg / 5 mL) = (750 mg / X mL).
Cross-multiply: 250X = 3,750; X = 15 mL.
Question 6: A provider orders 2,000 units of heparin subcutaneously.
The vial contains 5,000 units/mL. How many mL should the nurse
administer?
A. 0.2 mL
B. 0.4 mL
C. 0.5 mL
D. 0.8 mL
CORRECT ANSWER: B. 0.4 mL
Rationale: Divide the prescribed dose by the available concentration: 2,000
units ÷ 5,000 units/mL = 0.4 mL.
,Question 7: A client is prescribed 1.5 g of a medication. The medication
is available as 500 mg tablets. How many tablets should the nurse
administer?
A. 1 tablet
B. 2 tablets
C. 3 tablets
D. 4 tablets
CORRECT ANSWER: C. 3 tablets
Rationale: Convert grams to milligrams: 1.5 g = 1,500 mg. Then divide:
1,500 mg ÷ 500 mg = 3 tablets.
Question 8: An IV infusion is ordered at 150 mL/hr. The drop factor is 15
gtt/mL. What is the flow rate in drops per minute?
A. 25 gtt/min
B. 38 gtt/min
C. 42 gtt/min
D. 50 gtt/min
CORRECT ANSWER: B. 38 gtt/min
Rationale: Use the formula: (Volume × Drop factor) ÷ Time in minutes. (150
mL × 15 gtt/mL) ÷ 60 min = 2,250 ÷ 60 = 37.5, rounded to 38 gtt/min.
Question 9: A client is prescribed 80 mg of furosemide IV. The vial is
labeled 40 mg/2 mL. How many mL should the nurse administer?
A. 2 mL
B. 3 mL
C. 4 mL
D. 5 mL
CORRECT ANSWER: C. 4 mL
Rationale: Using ratio and proportion: (40 mg / 2 mL) = (80 mg / X mL).
Cross-multiply: 40X = 160; X = 4 mL.
Question 10: A client is prescribed 300 mg of a medication. The
pharmacy supplies 100 mg/2 mL. How many mL should the nurse
administer?
, A. 3 mL
B. 4 mL
C. 5 mL
D. 6 mL
CORRECT ANSWER: D. 6 mL
Rationale: Using ratio and proportion: (100 mg / 2 mL) = (300 mg / X mL).
Cross-multiply: 100X = 600; X = 6 mL.
Question 11: A client is prescribed 0.25 mg of digoxin. The medication is
available as 0.125 mg tablets. How many tablets should the nurse
administer?
A. 1 tablet
B. 2 tablets
C. 3 tablets
D. 4 tablets
CORRECT ANSWER: B. 2 tablets
Rationale: Divide the prescribed dose by the available dose: 0.25 mg ÷
0.125 mg = 2 tablets.
Question 12: A provider orders 1,500 mL of IV fluid to infuse over 10
hours. The nurse should set the IV pump to deliver how many mL/hr?
A. 100 mL/hr
B. 125 mL/hr
C. 150 mL/hr
D. 175 mL/hr
CORRECT ANSWER: C. 150 mL/hr
Rationale: Divide the total volume by the total time: 1,500 mL ÷ 10 hours =
150 mL/hr.
Question 13: A client is prescribed 2 mg of a medication. The pharmacy
supplies 0.5 mg/mL. How many mL should the nurse administer?
A. 1 mL
B. 2 mL
C. 3 mL
D. 4 mL
Practice Questions & Answers, ATI RN Dosage
Calculation Exam Prep, Nursing Math Test Bank,
Medication Dosage Calculations, IV Flow Rates, Pump
Rates, Weight-Based Dosing, Dimensional Analysis,
Pediatric Dosages, Safe Medication Administration,
and Detailed Rationales
Question 1: A client is prescribed 500 mg of a medication. The
pharmacy supplies the medication in 250 mg tablets. How many
tablets should the nurse administer?
A. 0.5 tablet
B. 1 tablet
C. 2 tablets
D. 3 tablets
CORRECT ANSWER: C. 2 tablets
Rationale: To determine the number of tablets, divide the prescribed dose
by the available dose: 500 mg ÷ 250 mg = 2 tablets.
Question 2: A provider orders 1,000 mL of IV fluid to infuse over 8 hours.
The nurse should set the IV pump to deliver how many mL/hr?
A. 100 mL/hr
B. 125 mL/hr
C. 150 mL/hr
D. 200 mL/hr
CORRECT ANSWER: B. 125 mL/hr
Rationale: Divide the total volume by the total time in hours: 1,000 mL ÷ 8
hours = 125 mL/hr.
Question 3: A client is prescribed 0.5 g of an antibiotic. The medication
is available as 250 mg capsules. How many capsules should the nurse
administer?
A. 1 capsule
B. 2 capsules
C. 3 capsules
D. 4 capsules
CORRECT ANSWER: B. 2 capsules
,Rationale: First convert grams to milligrams: 0.5 g = 500 mg. Then divide the
prescribed dose by the available dose: 500 mg ÷ 250 mg = 2 capsules.
Question 4: A client weighs 154 lb. The provider orders a medication at
5 mg/kg/day. What is the client's weight in kilograms?
A. 60 kg
B. 65 kg
C. 70 kg
D. 75 kg
CORRECT ANSWER: C. 70 kg
Rationale: To convert pounds to kilograms, divide by 2.2: 154 lb ÷ 2.2 = 70
kg.
Question 5: A client is prescribed 750 mg of a medication. The
pharmacy provides a suspension labeled 250 mg/5 mL. How many mL
should the nurse administer?
A. 5 mL
B. 10 mL
C. 15 mL
D. 20 mL
CORRECT ANSWER: C. 15 mL
Rationale: Using ratio and proportion: (250 mg / 5 mL) = (750 mg / X mL).
Cross-multiply: 250X = 3,750; X = 15 mL.
Question 6: A provider orders 2,000 units of heparin subcutaneously.
The vial contains 5,000 units/mL. How many mL should the nurse
administer?
A. 0.2 mL
B. 0.4 mL
C. 0.5 mL
D. 0.8 mL
CORRECT ANSWER: B. 0.4 mL
Rationale: Divide the prescribed dose by the available concentration: 2,000
units ÷ 5,000 units/mL = 0.4 mL.
,Question 7: A client is prescribed 1.5 g of a medication. The medication
is available as 500 mg tablets. How many tablets should the nurse
administer?
A. 1 tablet
B. 2 tablets
C. 3 tablets
D. 4 tablets
CORRECT ANSWER: C. 3 tablets
Rationale: Convert grams to milligrams: 1.5 g = 1,500 mg. Then divide:
1,500 mg ÷ 500 mg = 3 tablets.
Question 8: An IV infusion is ordered at 150 mL/hr. The drop factor is 15
gtt/mL. What is the flow rate in drops per minute?
A. 25 gtt/min
B. 38 gtt/min
C. 42 gtt/min
D. 50 gtt/min
CORRECT ANSWER: B. 38 gtt/min
Rationale: Use the formula: (Volume × Drop factor) ÷ Time in minutes. (150
mL × 15 gtt/mL) ÷ 60 min = 2,250 ÷ 60 = 37.5, rounded to 38 gtt/min.
Question 9: A client is prescribed 80 mg of furosemide IV. The vial is
labeled 40 mg/2 mL. How many mL should the nurse administer?
A. 2 mL
B. 3 mL
C. 4 mL
D. 5 mL
CORRECT ANSWER: C. 4 mL
Rationale: Using ratio and proportion: (40 mg / 2 mL) = (80 mg / X mL).
Cross-multiply: 40X = 160; X = 4 mL.
Question 10: A client is prescribed 300 mg of a medication. The
pharmacy supplies 100 mg/2 mL. How many mL should the nurse
administer?
, A. 3 mL
B. 4 mL
C. 5 mL
D. 6 mL
CORRECT ANSWER: D. 6 mL
Rationale: Using ratio and proportion: (100 mg / 2 mL) = (300 mg / X mL).
Cross-multiply: 100X = 600; X = 6 mL.
Question 11: A client is prescribed 0.25 mg of digoxin. The medication is
available as 0.125 mg tablets. How many tablets should the nurse
administer?
A. 1 tablet
B. 2 tablets
C. 3 tablets
D. 4 tablets
CORRECT ANSWER: B. 2 tablets
Rationale: Divide the prescribed dose by the available dose: 0.25 mg ÷
0.125 mg = 2 tablets.
Question 12: A provider orders 1,500 mL of IV fluid to infuse over 10
hours. The nurse should set the IV pump to deliver how many mL/hr?
A. 100 mL/hr
B. 125 mL/hr
C. 150 mL/hr
D. 175 mL/hr
CORRECT ANSWER: C. 150 mL/hr
Rationale: Divide the total volume by the total time: 1,500 mL ÷ 10 hours =
150 mL/hr.
Question 13: A client is prescribed 2 mg of a medication. The pharmacy
supplies 0.5 mg/mL. How many mL should the nurse administer?
A. 1 mL
B. 2 mL
C. 3 mL
D. 4 mL
