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

0.5% w/v18 mg
V = mL
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 11 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v11 mg
V = mL
3.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.2 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.2 mg
V = mL
4.Medium
oxacillin 2 gAdd 11.5 mL sterile water.Powder volume: 1 mL.1000 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains oxacillin 2000 mg as a powder. The practice label says to add 11.5 mL of sterile water; the powder adds 1 mL to the volume. The prescribed dose is 1000 mg. What volume V do you draw up? Round to one decimal place.

2000 mg11.5 mL+1 mL1000 mg
V = mL
5.Hard
0123455 mL

A vial holds 250 mg of powder. You add 9.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 25 mg. Draw up the dose: what volume V do you give?

250 mg9.2 mL + 0.8 mL25 mg
V = mL
6.Hard
30%hydrogen peroxide+0%water? mL3%100 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 100 mL of 3% 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%3%100 mL
V = mL

Answer key

  1. 1. V = 3.6 mL
  2. 2. V = 2.2 mL
  3. 3. V = 0.2 mL
  4. 4. V = 6.3 mL
  5. 5. V = 1 mL
  6. 6. V = 90 mL

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