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

5% w/v35 mg
V = mL
2.Easy
0123455 mL

A solution is 1% w/v. You need 26 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v26 mg
V = mL
3.Medium
ampicillin 1 gAdd 3.5 mL sterile water.Powder volume: 0.5 mL.300 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains ampicillin 1000 mg as a powder. The practice label says to add 3.5 mL of sterile water; the powder adds 0.5 mL to the volume. The prescribed dose is 300 mg. What volume V do you draw up? Round to one decimal place.

1000 mg3.5 mL+0.5 mL300 mg
V = mL
4.Medium
penicillin G 5 000 000 unitsdiluent addedconcentration18.2 mL250 000 units/mL8.2 mL500 000 units/mL3.2 mL1 000 000 units/mL1 200 000 units → ? mL

Practice exercise (made-up values, not clinical guidance). A vial of penicillin G contains 5 000 000 units. Its practice label gives three strengths (see the table). You add 3.2 mL of diluent. The prescribed dose is 1 200 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL1 200 000 units
V = mL
5.Hard
0123455 mL

A vial holds 1000 mg of powder. You add 9.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 150 mg. Draw up the dose: what volume V do you give?

1000 mg9.8 mL + 0.2 mL150 mg
V = mL
6.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 9.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 660 mg. Draw up the dose: what volume V do you give?

2000 mg9.4 mL + 0.6 mL660 mg
V = mL

Answer key

  1. 1. V = 0.7 mL
  2. 2. V = 2.6 mL
  3. 3. V = 1.2 mL
  4. 4. V = 1.2 mL
  5. 5. V = 1.5 mL
  6. 6. V = 3.3 mL

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