Drug Calculations Refresher Sheet
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4Academic Skills Advice
Drug Calculations Refresher Sheet
Conversions:
X 1000
X 1000
X 1000
Grams
mg
mcg
litres
ml
÷ 1000
÷ 1000
÷ 1000
Body Weight:
4mg/kg means give 4mg for every kg the person weighs.
A 75 kg person would need 75 x 4 = 300mg.
Tablets:
Amount prescribed =
Number required
Amount in a tablet
Dosage Calculations (liquids or injections):
Amount you want x Volume it’s in
Required drug dose =
Amount you have
e.g. 50mg of a drug is required and your stock is 150mg in 6ml.
2
1
Required dose = (want)
50 x 6 (vol)
=
50 x 6 = 2ml
(have)
150
150
3
1
Hours
60
Remember:
Before doing any calculations – make sure your units are the same.
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H Jackson 2008 / Academic Skills
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Parent category: Medical