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

5% w/v205 mg
V = mL
2.Easy
0123455 mL

A solution is 2% w/v. You need 86 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v86 mg
V = mL
3.Medium
cefazolin 1 gAdd 4.5 mL sterile water.Powder volume: 0.5 mL.800 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains cefazolin 1000 mg as a powder. The practice label says to add 4.5 mL of sterile water; the powder adds 0.5 mL to the volume. The prescribed dose is 800 mg. What volume V do you draw up? Round to one decimal place.

1000 mg4.5 mL+0.5 mL800 mg
V = 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 0.21 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.21 mg
V = mL
5.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 3.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 1600 mg. Draw up the dose: what volume V do you give?

2000 mg3.8 mL + 0.2 mL1600 mg
V = mL
6.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 9.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 180 mg. Draw up the dose: what volume V do you give?

2000 mg9.5 mL + 0.5 mL180 mg
V = mL

Answer key

  1. 1. V = 4.1 mL
  2. 2. V = 4.3 mL
  3. 3. V = 4 mL
  4. 4. V = 0.21 mL
  5. 5. V = 3.2 mL
  6. 6. V = 0.9 mL

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