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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1.Easy
glycerin200 g1000 mL? % w/v

Practice exercise (made-up values, not clinical guidance). 200 g of glycerin is dissolved in water to a total volume of 1000 mL. What is the percentage strength p (% w/v)?

200 g1000 mL
p = %
2.Easy
sodium chloride0.9 g100 mL? % w/v

Practice exercise (made-up values, not clinical guidance). 0.9 g of sodium chloride is dissolved in water to a total volume of 100 mL. What is the percentage strength p (% w/v)?

0.9 g100 mL
p = %
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.22 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.22 mg
V = mL
4.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.49 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.49 mg
V = mL
5.Hard
0123455 mL

A vial holds 250 mg of powder. You add 4.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 235 mg. Draw up the dose: what volume V do you give?

250 mg4.6 mL + 0.4 mL235 mg
V = mL
6.Hard
2.5%120 g+0.5%hydrocortisone? g1.5%hydrocortisone

Practice exercise (made-up values, not clinical guidance). You have 120 g of 2.5% hydrocortisone ointment. How many grams m of 0.5% hydrocortisone ointment must you add to make a 1.5% ointment? Round to the nearest whole gram.

120 g · 2.5%0.5%1.5%
m = g

Answer key

  1. 1. p = 20 %
  2. 2. p = 0.9 %
  3. 3. V = 2.2 mL
  4. 4. V = 0.49 mL
  5. 5. V = 4.7 mL
  6. 6. m = 120 g

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