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Medical Math
Operations and Formulas
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Metric Abbreviations for Weight
Kilogram kgGram gmMilligram mgMicrogram mcgMetric Equivalencies for Weight 1 kilogram= 1000 g1gram= 1000 mg1 milligram= 1000 mcg
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• Household Abbreviation / Metric / Apothecary • 1 cup C 240 cc
• 1 tablespoon T (tbs) 15 cc or 15 ml
• 1 teaspoon t (tsp) 5 cc
• drop gtt depends on size of the drop
• pound lb 2.2 lb = 1 kg 1 lb. = 16 oz
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• The formula method: D x Q = X H• D - dosage desired or ordered
H - what is on hand (available)Q - unit of measure that contains the available dose. When using solid products (tablets, capsules) Q is always 1 and can be eliminated. Q varies when using liquid measures.X - the unknown dosage you need to administer
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Units• Calculating dosages in units (insulin,
heparin, pitocin, vitamins, some antibiotics)• Example: Ordered: Heparin 8000
units subcutaneous q12h Available: Heparin 10,000 units
per ml How much will you
administer?
• Formula: 8000 units X 1 ml = 0.8 ml 10,000 units
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Calculations based on body weight
• The first step is to convert the patient’s body weight into kg. The formula is 2.2 lb. = 1 kg.
• The second step is to calculate the medication dose.
• a. Calculate the daily dose
• b. Divide the daily dose by the number of doses to be administered.
• c. Use either the ratio-proportion or formula method to calculate the number of tablets/capsules or volume to be administered with each dose
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Temperature Conversion
°C = (°F-32) 5/9 or 0.5556
°F = (°C) 9/5 or 1.8 + 32