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 5% w/v. You need 210 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v210 mg
V = mL
2.Easy
Solution1:1 000? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:1 000 as a percentage strength p (% w/v).

1:1 000
p = %
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.5 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.5 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.82 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.82 mg
V = mL
5.Hard
5%20 g+1%coal tar? g2%coal tar

Practice exercise (made-up values, not clinical guidance). You have 20 g of 5% coal tar ointment. How many grams m of 1% coal tar ointment must you add to make a 2% ointment? Round to the nearest whole gram.

20 g · 5%1%2%
m = g
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 3.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 600 mg. Draw up the dose: what volume V do you give?

1000 mg3.5 mL + 0.5 mL600 mg
V = mL

Answer key

  1. 1. V = 4.2 mL
  2. 2. p = 0.1 %
  3. 3. V = 5 mL
  4. 4. V = 8.2 mL
  5. 5. m = 60 g
  6. 6. V = 2.4 mL

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