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

0.5% w/v3 mg
V = mL
2.Easy
0123455 mL

A solution is 5% w/v. You need 30 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v30 mg
V = mL
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.16 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.16 mg
V = mL
4.Medium
ceftriaxone 1 gAdd 9.6 mL sterile water.Powder volume: 0.4 mL.500 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. The prescribed dose is 500 mg. What volume V do you draw up? Round to one decimal place.

1000 mg9.6 mL+0.4 mL500 mg
V = mL
5.Hard
20%chlorhexidine+0%water? mL5%100 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 100 mL of 5% 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%5%100 mL
V = mL
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 1.9 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 720 mg. Draw up the dose: what volume V do you give?

1000 mg1.9 mL + 0.6 mL720 mg
V = mL

Answer key

  1. 1. V = 0.6 mL
  2. 2. V = 0.6 mL
  3. 3. V = 1.6 mL
  4. 4. V = 5 mL
  5. 5. V = 75 mL
  6. 6. V = 1.8 mL

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