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
Solution1:2 500? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:2 500 as a percentage strength p (% w/v).

1:2 500
p = %
2.Easy
0123455 mL

A solution is 2% w/v. You need 22 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v22 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 0.22 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.22 mg
V = mL
5.Hard
23%sodium chloride? mL+3%sodium chloride5%300 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 300 mL of 5% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 23% solution do you need? Round to the nearest whole mL.

23%3%5%300 mL
V = mL
6.Hard
20%chlorhexidine+0%water? mL2%900 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 900 mL of 2% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

20%0%2%900 mL
V = mL

Answer key

  1. 1. p = 0.04 %
  2. 2. V = 1.1 mL
  3. 3. C = 100 mg/mL
  4. 4. V = 2.2 mL
  5. 5. V = 30 mL
  6. 6. V = 810 mL

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