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 78 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v78 mg
V = mL
2.Easy
0123455 mL

A solution is 2% w/v. You need 62 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v62 mg
V = mL
3.Medium
ceftriaxone 2 gAdd 19.2 mL sterile water.Powder volume: 0.8 mL.? mg/mL

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 2000 mg as a powder. The practice label says to add 19.2 mL of sterile water; the powder adds 0.8 mL to the volume. What is the concentration C in mg/mL after reconstitution?

2000 mg19.2 mL+0.8 mL
C = mg/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 0.39 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.39 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 50 mg. Draw up the dose: what volume V do you give?

250 mg4.6 mL + 0.4 mL50 mg
V = mL
6.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 110 mg. Draw up the dose: what volume V do you give?

500 mg9.5 mL + 0.5 mL110 mg
V = mL

Answer key

  1. 1. V = 3.9 mL
  2. 2. V = 3.1 mL
  3. 3. C = 100 mg/mL
  4. 4. V = 0.39 mL
  5. 5. V = 1 mL
  6. 6. V = 2.2 mL

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