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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1.Easy
dextrose50% w/v20 mL? g

Practice exercise (made-up values, not clinical guidance). How many g of dextrose are in 20 mL of 50% w/v solution? Find m.

50% w/v20 mL
m = g
2.Easy
sodium chloride3% w/v500 mL? g

Practice exercise (made-up values, not clinical guidance). How many g of sodium chloride are in 500 mL of 3% w/v solution? Find m.

3% w/v500 mL
m = g
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 400 000 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 2 400 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL2 400 000 units
V = mL
4.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.76 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.76 mg
V = mL
5.Hard
30%hydrogen peroxide+0%water? mL3%1000 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 1000 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%1000 mL
V = mL
6.Hard
50%dextrose? mL+10%dextrose15%600 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 600 mL of 15% dextrose by mixing 50% and 10% dextrose. How many mL V of the 50% solution do you need? Round to the nearest whole mL.

50%10%15%600 mL
V = mL

Answer key

  1. 1. m = 10 g
  2. 2. m = 15 g
  3. 3. V = 2.4 mL
  4. 4. V = 7.6 mL
  5. 5. V = 900 mL
  6. 6. V = 75 mL

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