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

5% w/v170 mg
V = mL
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 11.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v11.5 mg
V = mL
3.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.81 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.81 mg
V = mL
4.Medium
ampicillin 500 mgAdd 1.8 mL sterile water.Powder volume: 0.2 mL.200 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains ampicillin 500 mg as a powder. The practice label says to add 1.8 mL of sterile water; the powder adds 0.2 mL to the volume. The prescribed dose is 200 mg. What volume V do you draw up? Round to one decimal place.

500 mg1.8 mL+0.2 mL200 mg
V = mL
5.Hard
20%chlorhexidine+0%water? mL5%500 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 500 mL of 5% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

20%0%5%500 mL
V = mL
6.Hard
0123455 mL

A vial holds 500 mg of powder. You add 1.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 225 mg. Draw up the dose: what volume V do you give?

500 mg1.8 mL + 0.2 mL225 mg
V = mL

Answer key

  1. 1. V = 3.4 mL
  2. 2. V = 2.3 mL
  3. 3. V = 0.81 mL
  4. 4. V = 0.8 mL
  5. 5. V = 375 mL
  6. 6. V = 0.9 mL

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