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
0123455 mL

A solution is 1% w/v. You need 41 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v41 mg
V = mL
2.Easy
0123455 mL

A solution is 5% w/v. You need 25 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v25 mg
V = mL
3.Medium
cefuroxime 750 mgAdd 7.2 mL sterile water.Powder volume: 0.3 mL.? 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. What is the concentration C in mg/mL after reconstitution?

750 mg7.2 mL+0.3 mL
C = mg/mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.66 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.66 mg
V = mL
5.Hard
2.5%20 g+0.5%hydrocortisone? g1%hydrocortisone

Practice exercise (made-up values, not clinical guidance). You have 20 g of 2.5% hydrocortisone ointment. How many grams m of 0.5% hydrocortisone ointment must you add to make a 1% ointment? Round to the nearest whole gram.

20 g · 2.5%0.5%1%
m = g
6.Hard
0123455 mL

A vial holds 500 mg of powder. You add 4.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 290 mg. Draw up the dose: what volume V do you give?

500 mg4.8 mL + 0.2 mL290 mg
V = mL

Answer key

  1. 1. V = 4.1 mL
  2. 2. V = 0.5 mL
  3. 3. C = 100 mg/mL
  4. 4. V = 6.6 mL
  5. 5. m = 60 g
  6. 6. V = 2.9 mL

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