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 19 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v19 mg
V = mL
2.Easy
epinephrine1:10 0005 mL? mg

Practice exercise (made-up values, not clinical guidance). A solution of epinephrine has a ratio strength of 1:10 000. How many milligrams m are in 5 mL?

1:10 0005 mL
m = mg
3.Medium
024681010 mL

A solution has a ratio strength of 1:10 000. You need 0.36 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

1:10 0000.36 mg
V = mL
4.Medium
00.10.20.30.40.50.60.70.80.911 mL

A solution has a ratio strength of 1:1000. You need 0.69 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

1:10000.69 mg
V = mL
5.Hard
23%sodium chloride? mL+3%sodium chloride13%100 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 100 mL of 13% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 23% solution do you need? Round to the nearest whole mL.

23%3%13%100 mL
V = mL
6.Hard
20%chlorhexidine+0%water? mL2%900 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 900 mL of 2% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

20%0%2%900 mL
V = mL

Answer key

  1. 1. V = 3.8 mL
  2. 2. m = 0.5 mg
  3. 3. V = 3.6 mL
  4. 4. V = 0.69 mL
  5. 5. V = 50 mL
  6. 6. V = 810 mL

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