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

0.5% w/v24.5 mg
V = mL
2.Easy
0123455 mL

A solution is 1% w/v. You need 12 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v12 mg
V = mL
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.2 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.2 mg
V = mL
4.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
5.Hard
23%sodium chloride? mL+3%sodium chloride13%200 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 200 mL of 13% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 23% solution do you need? Round to the nearest whole mL.

23%3%13%200 mL
V = mL
6.Hard
0123455 mL

A vial holds 500 mg of powder. You add 1.7 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 320 mg. Draw up the dose: what volume V do you give?

500 mg1.7 mL + 0.8 mL320 mg
V = mL

Answer key

  1. 1. V = 4.9 mL
  2. 2. V = 1.2 mL
  3. 3. V = 2 mL
  4. 4. C = 100 mg/mL
  5. 5. V = 100 mL
  6. 6. V = 1.6 mL

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