Medical Metric Tables
 
medical metric conversions
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These conversions and general data are for use in the home. If precise conversions are needed please use the tables accessed from the home page. The measurements given here are based on Imperial / UK units. Standard USA units are slightly different and are marked.

on this page, jump to:-
[ abbreviation of measures ][ liquid conversions][ solid conversions ][ international units IU ][ % solutions]
[ calculate mEq ][ drug administration times ][ common abbreviations ][ estimate lean body weight ]

Apothecary / Metric and Other Conversion Equivalents 

Abbreviation of Measures
gal or gals = gallons g = gram
O, pt or pts = pints kg = kilogram (1,000g)
oz or ozs = ounces mg = milligram (1/1,000g)
fl.oz = fluid ounces mcg or µg = microgram (1/1,000,000g)
lb or lbs = pounds L or l = litre (or liter in US)
st = stones cl = centilitre (1/100 L)
gtts = drops ml = millilitre (1/1000 L)
iu = international units µl = microlitre (1/1,000,000 L)
m or min = minims meq or mEq = Milliequivalent
hr = hour m = metre (or meter in US)
min = minutes mm = millimetre (1/1,000 m)
sec = seconds cc or cu.cm = cubic centimetres (1/1,000 L)
ft = foot or feet dr = dram or drachm
gr = grains sc = scruple
t or tsp = teaspoon T or tbsp = tablespoon

Of General Interest
One litre of pure water weighs approx. one kilogram so 1cc of water weighs 1 gram.
A steel paper clip weighs about 1 gram.
"A spoonful" means heaped or rounded, with as much above the bowl of the spoon as in the spoon. Obviously, a measure of liquid is a level spoonful.

Liquid Metric Conversions
1 gallon (gal)(US) = 3785 ml  1 gallon (UK) = 4546 ml 
1 pint (pt)(US) = 473.18 ml 1 pint (UK) = 568.26 ml
16 fluid ounces (US) = 473.18 ml 20 fluid ounces (UK) = 568.26 ml
8 fluid ounces (US) = 236.59 ml 10 fluid ounces (UK) = 284.13 ml
4 fluid ounces (US) = 118.29 ml 5 fluid ounces (UK) = 142.07 ml
1 fluid ounce (fl.oz)(US) = 29.57 ml 1 fluid ounce (UK) = 28.41 ml
- - - -
1cc = 1g = 1ml (approx) 1 teaspoon = 5 ml (approx)
10 minims = 0.616 ml 1 tablespoon = 15 ml (approx)
15 to 16 drops ( gtts ) = 1 cc = 1ml 1 drop = 1 minim approx
Note:- Spoon and drop conversions should be regarded as approximations due to the different surface tensions and specific gravity of various liquids.

Solid Metric Conversions
1 pound (avoirdupois) = 453.592 g   1/2 grain = 30 mg
1 pound (apothecary) = 373.242 g 1/4 grain = 15 mg
1 ounce (avoirdupois) = 28.35 g 1/8 grain = 8 mg
1 ounce (apothecary) = 31.10 g 1/12 grain = 5 mg
15 grains = 1 g  1/100 grain = 600 mcg
10 grains = 600 mg 1/150 grain = 400 mcg
7 1/2 grains = 500 mg 1/200 grain = 300 mcg
5 grains = 300 mg  1/250 grain = 250 mcg
1 1/2 grains = 100 mg  1/300 grain = 200 mcg
1 grain = 64.79891 mg 1 kilogram = 2.2 pounds
1 pound = 0.45 kilograms (kg)  1 stone = 6.35 kg
1000 mcg = 300 to 7000 iu (below) 1000 mcg = 1 mg
1 scruple = 1.2 g 1 drachm = 28.8 g
Note on International Units ( i.u. )
An old measurement of vitamin activity determined by biological methods as opposed to new measures that are determined by direct chemical analysis.
Many health foods and supplements still use i.u. ( IU ).
For Vitamin A, 1 i.u. = 0.3µg retinol, 3.6µg b-carotene, or 7.2µg other vitamin A carotenoids
For Vitamin D, 1 i.u. = 0.025µg cholecalciferol
For Vitamin E, 1 i.u. = 0.67µg natural a-tocopherol (different conversion factors are used for different forms of vitamin E)


.


Ratios and Percent Solutions 
1:100  = 1g/100ml [10mg/ml]  = 1%
1:200  = 500mg/100ml [5mg/ml] = 0.5%
1:1,000  = 100mg/100ml [1mg/ml]  = 0.1%
1:5,000  = 20mg/100ml [200mcg/ml] = 0.02%
1:10,000  = 10mg/100ml [100mcg/ml]  = 0.01%


Calculation of Milliequivalents (mEq)

mEq = Weight (grams) / mEq Weight (grams)

Ion or Compound
mEq W.(g)
Ion or Compound
mEq W.(g)
Na+ 0.023 HC03- 0.061
K+ 0.039 NaCl 0.0585
Ca++ 0.020  KCl  0.0745 
Mg++  0.012 CaCl.2H2O 0.0735
NH4+ 0.018 NH4Cl  0.0535 
Cl 0.0355 MgSO4.7H20  0.123
Lactate  0.089 NaHCO3 0.084
Acetate 0.059 Ca Gluconate 0.224
Citrate 0.063 Phosphorus 0.031

For milliequivalent weights not shown, use the formula:-
milliequivalent weight (mEq W.) =
Atomic Weight (g) / (Valence) x 1,000



Drug Administration Times 
Standardised medication administration times should be followed as much as possible. The following table shows those hours of the day which are to be used as standardised times of medication administration. If the prescriber wishes the first dose to be administered before the earliest available standardised time then the prescriber should state "expedite" or "first dose now" with the drug order.
In ICU's the first dose of a newly ordered parenteral antibiotic regimen should be administered within 2 hours unless specified otherwise by the prescriber.

Ordered Time
Hour(s) to be given
QAM 08
QD  08
QHS 21
QPM 17
BID 08 17
Q12H 08 20
Q8H 08 16 24
TID 08 12 17
TID AC 07 12 17
TID W/M 0730 1230 1730
QID 08 12 17 21
Q6H 06 12 18 24
AC & HS  07 12 17 21
PC & HS 08 13 18 21
1 HR AC & HS 0630 1130 1630 2100
1 HR PC & HS 0830 1330 1830 2100
5 X's/day 06 1030 15 1930 23
Q4H 04 08 12 16 20 24

Common Terms and Abbreviations

Term or Phrase 
Abbreviation
Meaning
ad ad to, up to
ad libitum ad. lib. at pleasure
ana a.a. of each
ante cibos a.c. before meals
aqua aq. water 
bis in die b.i.d. twice a day
collyrium collyr. eye lotion
cum c. with 
cum aqua cum aq. with water
dentur tales doses d.t.d. give such doses
dispensa disp. dispense
et et and
gutta, guttae gtt. drop, drops
hora somni h.s. at bedtime
in vitro in vit. in glass
misce m. mix
non repetatur non. rep. do not repeat
oculus dexter o.d. right eye
oculus sinister o.s. left eye
omni die o.d. daily
omni mane o.m. every morning
omni nocte o.n. every night
per os p.o. by mouth
placebo placebo to please
post cibos p.c. after meals
pro re nata p.r.n. as the occasion arises
quantum sufficiat q.s. sufficient quantity
quater in die q.i.d. four times a day
recipe Rx take
semis ss _ one-half
sine s,s without
si opus sit s.o.s. if necessary
ter in die t.i.d. three times a day
trochiscus, torchisci troch. lozenge, lozenges
unguentum ungt. ointment
ut dictum ut dict. as directed


Estimating Lean Body Weight

Lean Body Weight Calculation: Males 50kg + 2.3kg per each inch over 5 feet of height
Females 45kg + 2.3kg per each inch over 5 feet of height
In patients whose actual weight is > 20% over the above calculated ideal body weight, add 40% of the difference between the actual and the calculated ideal weights to the calculated ideal weight to arrive at a corrected ideal body weight.
1kg = 2.2 lbs. 14 lbs. = 1 stone = 6.35 kg

Height
Estimated Lean Body Weight
(+) or ( - ) 2.3kg per inch over/under 5 feet tall 
(+) 50kg for men or (+) 45.5kg for women
Imperial / metric
Males (kg)
Females (kg)
4 ft 8 in / 142 cm
40.8
36.3
4 ft 9 in / 145 cm
43.1
38.6
4 ft 10 in / 147 cm
45.4
40.9
4 ft 11 in / 150 cm
47.7
43.2
5 ft 0 in / 152 cm
50.0
45.5
5 ft 1 in / 155 cm
52.3
47.8
5 ft 2 in / 157 cm
54.6
50.1
5 ft 3 in / 160 cm
56.9
52.4
5 ft 4 in / 163 cm
59.2
54.7
5 ft 5 in / 165 cm
61.5
57.0
5 ft 6 in / 168 cm
63.8
59.3
5 ft 7 in / 170 cm
66.1
61.6
5 ft 8 in / 173 cm
68.4
63.9
5 ft 9 in / 175 cm
70.7
66.2
5 ft 10 in / 178 cm
73.0
68.5
5 ft 11 in / 180 cm
75.3
70.8
6 ft 0 in / 183 cm
77.6
73.1
6 ft 1 in / 185 cm
79.9
75.4
6 ft 2 in / 188 cm
82.2
77.7
6 ft 3 in / 191 cm
84.5
80.0
6 ft 4 in / 193 cm
86.8
82.3
6 ft 5 in / 196 cm
89.1
84.6
6 ft 6 in / 198 cm
91.4
86.9
6 ft 7 in / 201 cm
93.7
89.2
6 ft 8 in / 203 cm
96.0
91.5

For metric conversions go to a unit starting with -
a b c d e f g h i j k l m n o p q r s t u v w y

Related pages
" Home page
" Info on SI Units
" SI Unit Descriptions
" SI Derived Units
" SI Prefixes (mega, giga)
" Imperial/UK Units
" Scientific Notation
  (i.e. what is 1.00E+09)
Detail pages
" Feet to metres calculator
" Metres to feet calculator
"
British Thermal Units Btu
" Density of bulk materials
" Density of liquids
" Specific Gravity of water
" Density of metals
" Density of woods
" Kitchen metric
" Medical metric
" Parts per million - ppm
" Clothing metric
" Yarn metric
" Time
" cc to hp
" Paper & Envelopes
" Gross to Nett price
" Nett to Gross price
" Add on Commission
" Sheet metal swg - mm
" Wire & rod swg - awg
" Electrical wire swg - awg
" Steam tables (4 pages)
" Watts, amps, volts, ohms
" M Threads & spanners
" Self tapping screws
" M tap & pilot drill sizes

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last modified : 7th. September 2011


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