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 0.5% w/v. You need 3.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v3.5 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
penicillin G 5 000 000 unitsdiluent addedconcentration18.2 mL250 000 units/mL8.2 mL500 000 units/mL3.2 mL1 000 000 units/mL2 000 000 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 2 000 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL2 000 000 units
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/mL750 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 750 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL750 000 units
V = mL
5.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 130 mg. Draw up the dose: what volume V do you give?

1000 mg9.6 mL + 0.4 mL130 mg
V = mL
6.Hard
50%dextrose+10%dextrose? mL30%250 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 250 mL of 30% dextrose by mixing 50% and 10% dextrose. How many mL V of the 10% solution do you need? Round to the nearest whole mL.

50%10%30%250 mL
V = mL

Answer key

  1. 1. V = 0.7 mL
  2. 2. V = 1.8 mL
  3. 3. V = 2 mL
  4. 4. V = 0.8 mL
  5. 5. V = 1.3 mL
  6. 6. V = 125 mL

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