Learn these pharmacy measurement conversions. They are very valuable for both the PTCE and the pharmacy technician work-setting. Note: Some common abbreviation mishaps are gram (g or gm) and grain (gr). Teaspoon is Tsp, while tablespoon is Tbsp.

The PTCE hones in on these common mistakes so you might get a question on your test that plays on this confusion. No worries though! You will be prepared and probably won’t even notice that the PTCB tried to trick you on test day.


Common Liquid Conversions Common Dry Conversions Metric Conversions
1 mL = 1 CC 1 oz = 30 g 1 kg = 1000 g
1 fl oz = 30 mL 1 lb (16 oz) = 454 g 1 g = 1000 mg
1 cup (8 fl oz) = 240mL 1 g = 15 grains 1 mg = 1000 mcg
1 pint (16 fl oz) = 473 mL 1 grain = 65 mg 1 kL = 1000 L
1 quart (32 fl oz) = 946 mL 1 kg = 2.2 lb 1 L = 1000 mL
1 gallon (128 fl oz) = 3785 mL
1 Tsp = 5 mL
1 Tbsp = 15 mL
1 Tbsp = 3 Tsp

pharmacy measurement conversions pharmacy pug

Study books like Mosby’s or Delmar’s books will list more pharmacy measurement conversions than the ones listed above. These are the most commonly tested pharmacy measurement conversions on the PTCE and what you will see on the job as a pharmacy technician. Honestly, we have never used measurements such as gallon or pint on the job. Liquid medications, like ProMod, list both the common and metric quantity on the bottle, but for prescription purposes, you will only be concerned with the metric quantity. FYI: A bottle of ProMod is 946 milliters, which is the equivalent to one quart.

Study tip: Print out the above table or write it down. The PTCE is timed so you will want to know these conversions “on the fly.” Even if you do not become certified, knowing these pharmacy measurement conversions can be a pharmacy tech’s best friend.


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