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 2% w/v. You need 64 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v64 mg
V = mL
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 21 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v21 mg
V = mL
3.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.61 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.61 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.46 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.46 mg
V = mL
5.Hard
20%60 g+0%base? g10%zinc oxide

Practice exercise (made-up values, not clinical guidance). You have 60 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.

60 g · 20%0%10%
m = g
6.Hard
2.5%120 g+0.5%hydrocortisone? g2%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 2% ointment? Round to the nearest whole gram.

120 g · 2.5%0.5%2%
m = g

Answer key

  1. 1. V = 3.2 mL
  2. 2. V = 4.2 mL
  3. 3. V = 0.61 mL
  4. 4. V = 4.6 mL
  5. 5. m = 60 g
  6. 6. m = 40 g

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