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Equivalents Among Metric_ Apothecaries_ and Household Systems

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```									       Equivalents Among Metric, Apothecaries’, and Household Systems

There are some equivalents in one system that have equivalents in another system; however,
equivalents are not exact measures, and you will see discrepancies. Several tables have been developed
illustrating conversions/equivalents. Sometimes drug companies use equivalents that may be different for
a measure. A common discrepancy is with grains, which is an apothecaries’ measure. Some tables will
indicate 65mg = gr 1 as opposed to 60mg = gr 1. Both of these equivalents are correct. However 60 mg
– gr 1 is most often used in medication calculations.

Memorize these common equivalents:

Metric                          Apothecaries’                         Household
mI or 1m                               I gtt
1 mL (cc)                         m15, or m16
4 or 5* mL (cc)                             i                               1 t, 1 tsp
15* or 16 mL (cc)                           iv                               1 T, tbs
1 g (1000mg)                           gr 15
mcg = 1 mg
60 mg - 65 mg                             gr 1
90 or 100 mg                            gr 1 ½
30 mL                                                                    1 oz
i
500 mL (cc)                                                              1 pt (16oz)
1000 mL (cc), 1 L                                                           1 qt (32 oz)
1 kg (1000 g)                                                                2.2 lb
2.54 cm                                                                   1 inch
To convert fahrenheit temperature to centigrade, subtract 32 from fahrenheit and multiply by 5/9 or
Equivalents Between Measurement Systems (*equivalent used most often)

= drain

= oz

gr= grain

m = minim

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