Metric, Apothecary, and Avoirdupois Systems Conversion Chart PDF

## Metric System 1. **Basic Units** - Mass = g or gram - Length = m or meter - Volume = L or liter - 1 cc (cubic centimeter) of water is approximately equal to 1 mL and weighs 1 g. ## Apothecary System 1. **Volume (Fluids or Liquid)** - 60 minims (mm) = 1 fluidrachm or fluidra...

## Metric System 1. **Basic Units** - Mass = g or gram - Length = m or meter - Volume = L or liter - 1 cc (cubic centimeter) of water is approximately equal to 1 mL and weighs 1 g. ## Apothecary System 1. **Volume (Fluids or Liquid)** - 60 minims (mm) = 1 fluidrachm or fluidram (f3) - 8 fluidrachms (480 minims) = 1 fluid ounce (f3) - 16 fluid ounces = 1 pint (pt) - 2 pints (32 fluid ounces) = 1 quart (qt) - 4 quarts (8 pints) = 1 gallon (gal) 2. **Mass (Weight)** - 20 grains (gr) = 1 scruple (3) - 3 scruples (60 grains) = 1 drachm or dram (3) - 8 drachms (480 grains) = 1 ounce (3) - 12 ounces (5760 grains) = 1 pound (lb) ## Avoirdupois System 1. **Volume** - 1 fluidrachm = 60 min. - 1 fluid ounce = 8 fl. dr. - 1 fluid ounce = 480 min. - 1 pint = 16 fl. oz. - 1 pint = 7680 min. - 1 quart = 2 pt. - 1 quart = 32 fl. oz. - 1 gallon = 4 qt. - 1 gallon = 128 fl. oz. 2. **Mass (Weight)** - The grain is common to both the apothecary and the avoirdupois systems. - 437.5 grains (gr) = 1 ounce (oz) - 16 ounces (7000 grains) = 1 pound (lb) ## Conversion ### Exact Equivalents: Exact equivalents are used for the conversion of specific quantities in pharmaceutical formulas and prescription compounding. 1. **Length** - 1 meter (m) = 39.37 in. - 1 inch (in) = 2.54 cm. 2. **Volume** - 1 ml = 16.23 minims (m) - 1 m = 0.06 mL - 1 f3 = 3.69 mL - 1 f3 = 29.57 mL - 1 pt = 473 mL - 1 gal (U.S.) = 3785 mL 3. **Mass** - 1 g = 15.432 gr - 1 kg = 2.20 lb (avoir.) - 1 gr = 0.065 g or 65 mg - 1 oz (avoir.) = 28.35 g - 1 3 (apoth.) = 31.1 g - 1 lb (avoir.) = 454 g - 1 lb (apoth.) = 373.2 g ### Other Equivalents: - 1 oz (avoir.) = 437.5 gr - 1 3 (apoth.) = 480 gr - 1 gal (U.S.) = 128 fl 3 - 1 fl 3 (water) = 455 gr - 1 gr (apoth.) = 1 gr (avoir.) ## Approximate Equivalents - 1 fluid dram = 1 teaspoonful - 1 fluid dram = 5 mL - 4 fluid ounces = 120 mL - 8 fluid ounces = 1 cup - 8 fluid ounces = 240 mL - 1 grain = 65 mg - 1 kg = 2.2 pounds (lb)