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 0.5% w/v. You need 23 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v23 mg
V = mL
2.Easy
epinephrine1:10 00010 mL? mg

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

1:10 00010 mL
m = mg
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.84 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.84 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.1 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.1 mg
V = mL
5.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 3.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 750 mg. Draw up the dose: what volume V do you give?

1000 mg3.4 mL + 0.6 mL750 mg
V = mL
6.Hard
20%100 g+0%base? g10%zinc oxide

Practice exercise (made-up values, not clinical guidance). You have 100 g of 20% zinc oxide ointment. How many grams m of plain ointment base (0%) must you add to make a 10% ointment? Round to the nearest whole gram.

100 g · 20%0%10%
m = g

Answer key

  1. 1. V = 4.6 mL
  2. 2. m = 1 mg
  3. 3. V = 8.4 mL
  4. 4. V = 1 mL
  5. 5. V = 3 mL
  6. 6. m = 100 g

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