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
Solution1:2 500? % w/v

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:2 500 as a percentage strength p (% w/v).

1:2 500
p = %
2.Easy
bupivacaine0.5% w/v10 mL? mg

Practice exercise (made-up values, not clinical guidance). How many mg of bupivacaine are in 10 mL of 0.5% w/v solution? Find m.

0.5% w/v10 mL
m = mg
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.32 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.32 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/mL600 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 600 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL600 000 units
V = mL
5.Hard
0123455 mL

A vial holds 250 mg of powder. You add 1.9 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 80 mg. Draw up the dose: what volume V do you give?

250 mg1.9 mL + 0.6 mL80 mg
V = mL
6.Hard
70%dextrose+10%dextrose? mL25%100 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 100 mL of 25% dextrose by mixing 70% and 10% dextrose. How many mL V of the 10% solution do you need? Round to the nearest whole mL.

70%10%25%100 mL
V = mL

Answer key

  1. 1. p = 0.04 %
  2. 2. m = 50 mg
  3. 3. V = 3.2 mL
  4. 4. V = 0.6 mL
  5. 5. V = 0.8 mL
  6. 6. V = 75 mL

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