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MedTestBankDosage Calculation for Nursing

BSA dosage calculation practice problems

Dosage calculation practice for nursing students: solve unlimited new problems below with instant checking, or work through the 15 problems with answers further down.

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Formula to use

BSA (m²) = √(height (cm) × weight (kg) ÷ 3,600)

Dose = dose per m² × BSA

Open the body surface area (bsa) and mg/m² dosing calculator to check your own numbers step by step.

15 practice problems with answers

Solve each problem on paper first, then open the answer to compare every step.

  1. A child is 110 cm tall and weighs 19 kg. The order is 50 mg/m². Using the Mosteller formula and a BSA rounded to the hundredth, what is the dose in mg? Round to the tenth.

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    1. BSA = √(110 × 19 ÷ 3,600) = 0.76 m².
    2. Dose = 50 mg/m² × 0.76 m² = 38 mg.

    Answer: 38 mg

  2. A child is 140 cm tall and weighs 29 kg. The order is 10 mg/m². Using the Mosteller formula and a BSA rounded to the hundredth, what is the dose in mg? Round to the tenth.

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    1. BSA = √(140 × 29 ÷ 3,600) = 1.06 m².
    2. Dose = 10 mg/m² × 1.06 m² = 10.6 mg.

    Answer: 10.6 mg

  3. A patient is 183 cm tall and weighs 98 kg. The order is 50 mg/m². Using the Mosteller formula and a BSA rounded to the hundredth, what is the dose in mg? Round to the tenth.

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    1. BSA = √(183 × 98 ÷ 3,600) = 2.23 m².
    2. Dose = 50 mg/m² × 2.23 m² = 111.5 mg.

    Answer: 111.5 mg

  4. Using the Mosteller formula, what is the body surface area of a patient who is 172 cm tall and weighs 62 kg? Round to the hundredth.

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    1. BSA = √(172 × 62 ÷ 3,600) = √2.9622 = 1.72 m².

    Answer: 1.72 m²

  5. Using the Mosteller formula, what is the body surface area of a patient who is 161 cm tall and weighs 51 kg? Round to the hundredth.

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    1. BSA = √(161 × 51 ÷ 3,600) = √2.2808 = 1.51 m².

    Answer: 1.51 m²

  6. A patient is 151 cm tall and weighs 52 kg. The order is 50 mg/m². Using the Mosteller formula and a BSA rounded to the hundredth, what is the dose in mg? Round to the tenth.

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    1. BSA = √(151 × 52 ÷ 3,600) = 1.48 m².
    2. Dose = 50 mg/m² × 1.48 m² = 74 mg.

    Answer: 74 mg

  7. A patient is 157 cm tall and weighs 57 kg. The order is 135 mg/m². Using the Mosteller formula and a BSA rounded to the hundredth, what is the dose in mg? Round to the tenth.

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    1. BSA = √(157 × 57 ÷ 3,600) = 1.58 m².
    2. Dose = 135 mg/m² × 1.58 m² = 213.3 mg.

    Answer: 213.3 mg

  8. Using the Mosteller formula, what is the body surface area of a child who is 119 cm tall and weighs 26 kg? Round to the hundredth.

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    1. BSA = √(119 × 26 ÷ 3,600) = √0.8594 = 0.93 m².

    Answer: 0.93 m²

  9. A patient is 190 cm tall and weighs 69 kg. The order is 135 mg/m². Using the Mosteller formula and a BSA rounded to the hundredth, what is the dose in mg? Round to the tenth.

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    1. BSA = √(190 × 69 ÷ 3,600) = 1.91 m².
    2. Dose = 135 mg/m² × 1.91 m² = 257.8 mg.

    Answer: 257.8 mg

  10. Using the Mosteller formula, what is the body surface area of a child who is 136 cm tall and weighs 31 kg? Round to the hundredth.

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    1. BSA = √(136 × 31 ÷ 3,600) = √1.1711 = 1.08 m².

    Answer: 1.08 m²

  11. Using the Mosteller formula, what is the body surface area of a patient who is 162 cm tall and weighs 73 kg? Round to the hundredth.

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    1. BSA = √(162 × 73 ÷ 3,600) = √3.285 = 1.81 m².

    Answer: 1.81 m²

  12. A child is 109 cm tall and weighs 21 kg. The order is 50 mg/m². Using the Mosteller formula and a BSA rounded to the hundredth, what is the dose in mg? Round to the tenth.

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    1. BSA = √(109 × 21 ÷ 3,600) = 0.8 m².
    2. Dose = 50 mg/m² × 0.8 m² = 40 mg.

    Answer: 40 mg

  13. Using the Mosteller formula, what is the body surface area of a patient who is 159 cm tall and weighs 52 kg? Round to the hundredth.

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    1. BSA = √(159 × 52 ÷ 3,600) = √2.2967 = 1.52 m².

    Answer: 1.52 m²

  14. Using the Mosteller formula, what is the body surface area of a child who is 92 cm tall and weighs 15 kg? Round to the hundredth.

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    1. BSA = √(92 × 15 ÷ 3,600) = √0.3833 = 0.62 m².

    Answer: 0.62 m²

  15. A patient is 186 cm tall and weighs 102 kg. The order is 135 mg/m². Using the Mosteller formula and a BSA rounded to the hundredth, what is the dose in mg? Round to the tenth.

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    1. BSA = √(186 × 102 ÷ 3,600) = 2.3 m².
    2. Dose = 135 mg/m² × 2.3 m² = 310.5 mg.

    Answer: 310.5 mg