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 2% w/v. You need 10 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v10 mg
V = mL
2.Easy
0123455 mL

A solution is 2% w/v. You need 36 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v36 mg
V = mL
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.68 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.68 mg
V = mL
4.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.23 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.23 mg
V = mL
5.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 4.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 1920 mg. Draw up the dose: what volume V do you give?

2000 mg4.8 mL + 0.2 mL1920 mg
V = mL
6.Hard
90%ethanol+0%water? mL45%100 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 100 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%100 mL
V = mL

Answer key

  1. 1. V = 0.5 mL
  2. 2. V = 1.8 mL
  3. 3. V = 6.8 mL
  4. 4. V = 0.23 mL
  5. 5. V = 4.8 mL
  6. 6. V = 50 mL

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