Essential Unit Conversions for Pharmacy Math

Metric System Conversions

The metric system is the standard for pharmacy. Key conversions include: 1 kg = 1000 g, 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL. Moving between units means moving the decimal point three places.

Common volume conversions: 1 teaspoon (tsp) = 5 mL, 1 tablespoon (tbsp) = 15 mL, 1 fluid ounce = 30 mL, 1 cup = 240 mL, 1 pint = 473 mL, 1 gallon = 3785 mL.

Weight Conversions

For weight: 1 kg = 2.2 lbs, 1 oz = 28.35 g, 1 lb = 454 g, 1 grain = 65 mg. The pound-to-kilogram conversion is particularly important for weight-based dosing calculations.

Temperature conversions are occasionally tested: F = (C x 9/5) + 32 and C = (F - 32) x 5/9. Normal body temperature is 98.6 F or 37 C.

Quick Review

Memorize these conversions and practice applying them in context. Use our PTCB flashcards for quick memorization and mini exams for application practice.