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
dextrose50% w/v20 mL? g

Practice exercise (made-up values, not clinical guidance). How many g of dextrose are in 20 mL of 50% w/v solution? Find m.

50% w/v20 mL
m = g
2.Easy
0123455 mL

A solution is 5% w/v. You need 245 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v245 mg
V = mL
3.Medium
cefazolin 1 gAdd 4.5 mL sterile water.Powder volume: 0.5 mL.? 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. What is the concentration C in mg/mL after reconstitution?

1000 mg4.5 mL+0.5 mL
C = mg/mL
4.Medium
oxacillin 2 gAdd 11.5 mL sterile water.Powder volume: 1 mL.? 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. What is the concentration C in mg/mL after reconstitution?

2000 mg11.5 mL+1 mL
C = mg/mL
5.Hard
0123455 mL

A vial holds 500 mg of powder. You add 4.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 240 mg. Draw up the dose: what volume V do you give?

500 mg4.6 mL + 0.4 mL240 mg
V = mL
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 1.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 450 mg. Draw up the dose: what volume V do you give?

1000 mg1.6 mL + 0.4 mL450 mg
V = mL

Answer key

  1. 1. m = 10 g
  2. 2. V = 4.9 mL
  3. 3. C = 200 mg/mL
  4. 4. C = 160 mg/mL
  5. 5. V = 2.4 mL
  6. 6. V = 0.9 mL

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