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
Solution1:500? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:500 as a percentage strength p (% w/v).

1:500
p = %
2.Easy
sodium chloride4.5 g1000 mL? % w/v

Practice exercise (made-up values, not clinical guidance). 4.5 g of sodium chloride is dissolved in water to a total volume of 1000 mL. What is the percentage strength p (% w/v)?

4.5 g1000 mL
p = %
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.4 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.4 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.6 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.6 mg
V = mL
5.Hard
0123455 mL

A vial holds 250 mg of powder. You add 9.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 42.5 mg. Draw up the dose: what volume V do you give?

250 mg9.8 mL + 0.2 mL42.5 mg
V = mL
6.Hard
0123455 mL

A vial holds 500 mg of powder. You add 9.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 195 mg. Draw up the dose: what volume V do you give?

500 mg9.6 mL + 0.4 mL195 mg
V = mL

Answer key

  1. 1. p = 0.2 %
  2. 2. p = 0.45 %
  3. 3. V = 4 mL
  4. 4. V = 6 mL
  5. 5. V = 1.7 mL
  6. 6. V = 3.9 mL

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