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

0.5% w/v16 mg
V = mL
2.Easy
sodium chloride3% w/v100 mL? g

Practice exercise (made-up values, not clinical guidance). How many g of sodium chloride are in 100 mL of 3% w/v solution? Find m.

3% w/v100 mL
m = g
3.Medium
ceftriaxone 1 gAdd 9.6 mL sterile water.Powder volume: 0.4 mL.300 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 300 mg. What volume V do you draw up? Round to one decimal place.

1000 mg9.6 mL+0.4 mL300 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.32 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.32 mg
V = mL
5.Hard
0123455 mL

A vial holds 500 mg of powder. You add 9.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 140 mg. Draw up the dose: what volume V do you give?

500 mg9.5 mL + 0.5 mL140 mg
V = mL
6.Hard
0123455 mL

A vial holds 250 mg of powder. You add 1.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 75 mg. Draw up the dose: what volume V do you give?

250 mg1.4 mL + 0.6 mL75 mg
V = mL

Answer key

  1. 1. V = 3.2 mL
  2. 2. m = 3 g
  3. 3. V = 3 mL
  4. 4. V = 3.2 mL
  5. 5. V = 2.8 mL
  6. 6. V = 0.6 mL

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