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
potassium permanganate1:5 000250 mL? mg

Practice exercise (made-up values, not clinical guidance). A solution of potassium permanganate has a ratio strength of 1:5 000. How many milligrams m are in 250 mL?

1:5 000250 mL
m = mg
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 10.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v10.5 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/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
4.Medium
ampicillin 1 gAdd 3.5 mL sterile water.Powder volume: 0.5 mL.800 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 800 mg. What volume V do you draw up? Round to one decimal place.

1000 mg3.5 mL+0.5 mL800 mg
V = mL
5.Hard
0123455 mL

A vial holds 250 mg of powder. You add 1.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 87.5 mg. Draw up the dose: what volume V do you give?

250 mg1.2 mL + 0.8 mL87.5 mg
V = mL
6.Hard
30%hydrogen peroxide+0%water? mL3%500 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 500 mL of 3% hydrogen peroxide from a 30% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

30%0%3%500 mL
V = mL

Answer key

  1. 1. m = 50 mg
  2. 2. V = 2.1 mL
  3. 3. V = 1.2 mL
  4. 4. V = 3.2 mL
  5. 5. V = 0.7 mL
  6. 6. V = 450 mL

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