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 23 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v23 mg
V = mL
2.Easy
potassium permanganate1:5 000100 mL? mg

Practice exercise (made-up values, not clinical guidance). A solution of potassium permanganate has a ratio strength of 1:5 000. How many milligrams m are in 100 mL?

1:5 000100 mL
m = mg
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.68 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.68 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.32 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.32 mg
V = mL
5.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 9.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 240 mg. Draw up the dose: what volume V do you give?

1000 mg9.4 mL + 0.6 mL240 mg
V = mL
6.Hard
0123455 mL

A vial holds 500 mg of powder. You add 3.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 162.5 mg. Draw up the dose: what volume V do you give?

500 mg3.6 mL + 0.4 mL162.5 mg
V = mL

Answer key

  1. 1. V = 2.3 mL
  2. 2. m = 20 mg
  3. 3. V = 6.8 mL
  4. 4. V = 3.2 mL
  5. 5. V = 2.4 mL
  6. 6. V = 1.3 mL

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