Weights and Measures

Weight Equivalents
Household Measures Abbreviations

1 gt = 0.06 mL
15 gtt = 1 mL
1 tsp = 5 mL
3 tsp = 1 tbsp
1 tbsp = 15 mL
1 jigger = 45 mL
1 teacup = 180mL
1 glass = 240 mL
1 measuring cup = 240 mL

gt = drop
gtt = drops
mL = milliliter(s)
tsp = teaspoon(s)
tbsp = tablespoon(s)
Metric Measures Abbreviations

1 metric ton = 1,000 kg
1 metric ton = 2,203 lb (av.)
1 kg = 1,000 g
1 kg = 2.203 lb (av.)
1 g = 1,000 mg
1 g = 0.035 oz (av.)
1 mg = 1,000 µg
1 µg = 0.001 mg
1 ng = 0.000001 mg

av. = avoirdupois
g = gram(s)
kg = kilogram(s)
lb = pound(s)
mg = milligram(s)
µg = microgram(s) (it is also abbreviated as mcg)
ng = nanogram(s)
oz = ounce(s)
Avoirdupois* Measures Abbreviations

1 lb = 16 oz
1 ton = 2,000 lb
1 oz = 28.35 g
1 lb = 454 g
1 lb = 0.454 kg
1 ton = 907.2 kg
1 ton = 0.907 metric tons

g = gram(s)
kg = kilogram(s)
lb = pound(s)
oz = ounce(s)
ton (2,000 lb) is also called short ton
* Avoirdupois is the common system of measuring in the USA.
Some Apothecary* Measures Abbreviations

1 gr = 1/20 scr (or 0.05 scr)
1 gr = 65.8 mg
1 scr = 20 gr
1 scr = 1.3 g
1 dr = 3 scr
1 dr = 3.9 g
1 mg = 0.015 gr
1 g = 15.43 gr
1 oz = 8 dr

dr = dram(s)
g = gram(s)
gr = grain(s)
scr = scruple(s)
* The apothecary measure system has been traditionally used by druggists and pharmacists.
Dosage Conversion Factors    

To convert mg/lb to mg/kg:
mg/kg = mg/lb * 2.2

 To convert mg/kg to mg/lb:
mg/lb = mg/kg * 0.454

1 ppm = 1µg/g or 1 mg/kg


Capacity or Volume Equivalents
Metric Measures Abbreviations

1 L = 1,000 mL
1 mL = 1 cc
30 mL 1 fl. oz (av.)
250 mL 8 fl. oz (av.)
500 mL 16 fl. oz (av.)
0.5 L 1pt (av.)
1,000 mL 32 fl. oz (av.)
1 L 1 qt (av.)
100 L = 26.5 gal. (av.)

av. = avoirdupois
cc = cubic centimeter(s)
fl oz = fluid ounce(s)
gal = gallon(s)
L = liter(s)
mL = milliliter(s)
pt = pint(s)
qt = quart(s)
* The symbol means approximately equal
Avoirdupois* Measures Abbreviations

1 fl oz = 29.57 mL
1 pt = 16 fl. oz
1 pt = 473.2 mL
1 qt = 2 pt
1 qt = 0.946 L
1 gal = 4 qt
1 gal = 3.785 L

av. = avoirdupois
fl oz = fluid ounce(s)
gal = gallon
pt = pint(s)
qt = quart(s)
* Avoirdupois is the common system of measuring in the USA.
Some Apothecary* Measures Abbreviations

1 min = 1/60 fl. dr (0.17 fl. dr)
1 min = 0.06 mL
1 fl. dr = 60 min
1 fl. dr = 3.7 mL
1 fl. oz (av.)  = 480 min
1 fl. oz (av.) = 8 fl. dr
1 fl. oz (av.) = 29.57 mL

av. = avoirdupois
min = minim (a minim equals one drop - 0.06 mL)
fl. dr = fluid dram
fl. oz = fluid ounce (avoirdupois)
* The apothecary system has been traditionally used by druggists and pharmacists.