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 5% w/v. You need 150 mg of the drug. Draw up the volume in the syringe: what volume V is that?

5% w/v150 mg
V = mL
2.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
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.52 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.52 mg
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.62 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.62 mg
V = mL
5.Hard
90%ethanol+0%water? mL45%900 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 900 mL of 45% ethanol from a 90% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

90%0%45%900 mL
V = mL
6.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 9.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 160 mg. Draw up the dose: what volume V do you give?

1000 mg9.6 mL + 0.4 mL160 mg
V = mL

Answer key

  1. 1. V = 3 mL
  2. 2. m = 10 g
  3. 3. V = 5.2 mL
  4. 4. V = 6.2 mL
  5. 5. V = 450 mL
  6. 6. V = 1.6 mL

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