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 0.5% w/v. You need 12 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v12 mg
V = mL
2.Easy
bupivacaine0.25% w/v20 mL? mg

Practice exercise (made-up values, not clinical guidance). How many mg of bupivacaine are in 20 mL of 0.25% w/v solution? Find m.

0.25% w/v20 mL
m = mg
3.Medium
ampicillin 500 mgAdd 1.8 mL sterile water.Powder volume: 0.2 mL.125 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains ampicillin 500 mg as a powder. The practice label says to add 1.8 mL of sterile water; the powder adds 0.2 mL to the volume. The prescribed dose is 125 mg. What volume V do you draw up? Round to one decimal place.

500 mg1.8 mL+0.2 mL125 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.26 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.26 mg
V = mL
5.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 9.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 70 mg. Draw up the dose: what volume V do you give?

1000 mg9.5 mL + 0.5 mL70 mg
V = mL
6.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 2.3 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 960 mg. Draw up the dose: what volume V do you give?

2000 mg2.3 mL + 0.2 mL960 mg
V = mL

Answer key

  1. 1. V = 2.4 mL
  2. 2. m = 50 mg
  3. 3. V = 0.5 mL
  4. 4. V = 2.6 mL
  5. 5. V = 0.7 mL
  6. 6. V = 1.2 mL

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