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
Solution1:250? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:250 as a percentage strength p (% w/v).

1:250
p = %
2.Easy
0123455 mL

A solution is 2% w/v. You need 84 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v84 mg
V = mL
3.Medium
ceftriaxone 1 gAdd 9.6 mL sterile water.Powder volume: 0.4 mL.? mg/mL

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 1000 mg as a powder. The practice label says to add 9.6 mL of sterile water; the powder adds 0.4 mL to the volume. What is the concentration C in mg/mL after reconstitution?

1000 mg9.6 mL+0.4 mL
C = mg/mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.7 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.7 mg
V = mL
5.Hard
0123455 mL

A vial holds 500 mg of powder. You add 9.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 115 mg. Draw up the dose: what volume V do you give?

500 mg9.5 mL + 0.5 mL115 mg
V = mL
6.Hard
30%hydrogen peroxide+0%water? mL6%100 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 100 mL of 6% hydrogen peroxide from a 30% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

30%0%6%100 mL
V = mL

Answer key

  1. 1. p = 0.4 %
  2. 2. V = 4.2 mL
  3. 3. C = 100 mg/mL
  4. 4. V = 7 mL
  5. 5. V = 2.3 mL
  6. 6. V = 80 mL

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