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 1% w/v. You need 13 mg of the drug. Draw up the volume in the syringe: what volume V is that?

1% w/v13 mg
V = mL
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 19.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v19.5 mg
V = mL
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.88 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.88 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/mL300 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 18.2 mL of diluent. The prescribed dose is 300 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL300 000 units
V = mL
5.Hard
0123455 mL

A vial holds 2000 mg of powder. You add 9.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 620 mg. Draw up the dose: what volume V do you give?

2000 mg9.2 mL + 0.8 mL620 mg
V = mL
6.Hard
70%dextrose? mL+10%dextrose20%1500 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 1500 mL of 20% dextrose by mixing 70% and 10% dextrose. How many mL V of the 70% solution do you need? Round to the nearest whole mL.

70%10%20%1500 mL
V = mL

Answer key

  1. 1. V = 1.3 mL
  2. 2. V = 3.9 mL
  3. 3. V = 8.8 mL
  4. 4. V = 1.2 mL
  5. 5. V = 3.1 mL
  6. 6. V = 250 mL

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