Pharmacy calculations worksheet with answers

Free printable Pharmacy calculations worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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Name: ____________________   Date: ____________

1.Easy
potassium permanganate1:10 0001000 mL? mg

Practice exercise (made-up values, not clinical guidance). A solution of potassium permanganate has a ratio strength of 1:10 000. How many milligrams m are in 1000 mL?

1:10 0001000 mL
m = mg
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 14 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v14 mg
V = mL
3.Medium
cefuroxime 750 mgAdd 7.2 mL sterile water.Powder volume: 0.3 mL.600 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains cefuroxime 750 mg as a powder. The practice label says to add 7.2 mL of sterile water; the powder adds 0.3 mL to the volume. The prescribed dose is 600 mg. What volume V do you draw up? Round to one decimal place.

750 mg7.2 mL+0.3 mL600 mg
V = mL
4.Medium
ceftriaxone 2 gAdd 19.2 mL sterile water.Powder volume: 0.8 mL.1200 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 2000 mg as a powder. The practice label says to add 19.2 mL of sterile water; the powder adds 0.8 mL to the volume. The prescribed dose is 1200 mg. What volume V do you draw up? Round to one decimal place.

2000 mg19.2 mL+0.8 mL1200 mg
V = mL
5.Hard
0123455 mL

A vial holds 500 mg of powder. You add 9.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 230 mg. Draw up the dose: what volume V do you give?

500 mg9.4 mL + 0.6 mL230 mg
V = mL
6.Hard
0123455 mL

A vial holds 500 mg of powder. You add 4.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 240 mg. Draw up the dose: what volume V do you give?

500 mg4.6 mL + 0.4 mL240 mg
V = mL

Answer key

  1. 1. m = 100 mg
  2. 2. V = 2.8 mL
  3. 3. V = 6 mL
  4. 4. V = 12 mL
  5. 5. V = 4.6 mL
  6. 6. V = 2.4 mL

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