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
sodium chloride0.9% w/v250 mL? g

Practice exercise (made-up values, not clinical guidance). How many g of sodium chloride are in 250 mL of 0.9% w/v solution? Find m.

0.9% w/v250 mL
m = g
2.Easy
0123455 mL

A solution is 1% w/v. You need 31 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v31 mg
V = mL
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.3 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.3 mg
V = mL
4.Medium
oxacillin 2 gAdd 11.5 mL sterile water.Powder volume: 1 mL.1600 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 1600 mg. What volume V do you draw up? Round to one decimal place.

2000 mg11.5 mL+1 mL1600 mg
V = mL
5.Hard
2.5%20 g+0.5%hydrocortisone? g1.5%hydrocortisone

Practice exercise (made-up values, not clinical guidance). You have 20 g of 2.5% hydrocortisone ointment. How many grams m of 0.5% hydrocortisone ointment must you add to make a 1.5% ointment? Round to the nearest whole gram.

20 g · 2.5%0.5%1.5%
m = g
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 9.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 230 mg. Draw up the dose: what volume V do you give?

1000 mg9.2 mL + 0.8 mL230 mg
V = mL

Answer key

  1. 1. m = 2.25 g
  2. 2. V = 3.1 mL
  3. 3. V = 3 mL
  4. 4. V = 10 mL
  5. 5. m = 20 g
  6. 6. V = 2.3 mL

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