Dosage Practice

NCLEX Dosage Calculation Questions: The Format and How to Practice

Dosage calculation items on the NCLEX are fill-in-the-blank: you type a number, with the unit and the rounding rule given in the question. There is one correct answer and no partial credit, and a calculator is provided on screen.

How to prepare

  1. 1 Read the unit and the rounding instruction first. The question tells you whether to round to a whole number, tenths or hundredths.
  2. 2 Use the on-screen calculator but write the set-up on your whiteboard so you can see the units cancel.
  3. 3 Type only the number. The unit is already shown next to the box.
  4. 4 Check your answer makes clinical sense: a 20 mL injection or a 2,000 mL/hr pump rate means a slip somewhere.

Worked Examples

Example 1

A client weighs 176 lb. Ordered: 2 mg/kg IV. Available: 40 mg/mL. How many mL? Round to the nearest tenth.

  1. 176 ÷ 2.2 = 80 kg.
  2. 2 × 80 = 160 mg.
  3. 160 ÷ 40 = 4 mL.

Answer: 4

Example 2

Order: 1 L of fluid over 10 hours. Pump rate in mL/hr? Round to the nearest whole number.

  1. 1 L = 1,000 mL.
  2. 1,000 ÷ 10 = 100 mL/hr.

Answer: 100

Try five free problems

One exact answer, rounded as asked, no partial credit. No sign-up needed.

Problem 1 of 5No sign-up needed

Convert 0.3 L to mL.

exact answer, no rounding needed

mL

Common Mistakes

  • Typing the unit or a trailing zero

    The box wants a number only. 4 is right; 4.0 mL is not.

  • Ignoring the rounding instruction

    If it says nearest tenth, 15.75 must be entered as 15.8.

  • Skipping the sense check

    The NCLEX tests judgment as much as arithmetic. An answer that could not be given safely is a signal to recalculate.

Questions Students Ask

How many dosage questions will I get?

Nobody can say in advance; the exam adapts to you. Expect a handful, and expect them to be exact.

Can I use a calculator?

Yes, there is one on screen. You cannot bring your own.

Is this site affiliated with the NCLEX or NCSBN?

No. NCLEX is a registered trademark of the National Council of State Boards of Nursing. We practice the math it tests and have no connection with the organization.

Practice until it feels easy

Work through the lessons with fresh numbers every time. The practice round and the first five problems of lesson 1 are free.

See all lessons