This section is from the book "A Manual of Materia Medica and Pharmacology", by David M. R. Culbreth. Also available from Amazon: Manual of Materia Medica and Pharmacology.
Table of Comparison between Metric, Avoirdupois, and Apothecaries Weights
Names. | Numerical Expressions. | Equivalents in Grains. | Equivalents in Avoirdupois | Equivalents in Apothecaries' Weight. | ||||||
Gm. | Gr. | lb. | oz. | gr. | ℥ | 3 | gr. | |||
Milligramme, | Mg. | (mg.) | 0.001 | 0.01543 | 0 | 0 | 1/64 | 0 | 0 | 1/64 |
Centigramme, | Cg. | (eg.) | 0.01 | 0.15432 | 0 | 0 | 1/6 | 0 | 0 | 1/6 |
Decigramme, | Dg. | (dg.) | 0.1 | 1.54323 | 0 | 0 | 1.5 | 0 | 0 | 1.5 |
Gramme, | Gm. | (gm.) | 1.0 | 15.43235 | 0 | 0 | 15.4 | 0 | 0 | 15.4 |
Dekagramme, | Dg. | 10.0 | 154.32356 | 0 | 1/4 | 45.0 | 0 | 2 | 34.0 | |
Hectogramme, | Hg. | 100.0 | 1543.23563 | 0 | 3 1/2 | 12.0 | 3 | 1 | 43.0 | |
Kilogramme, | Kg. | 1000.0 | 15432.35639 | 2 | 3 1/2 | 10.47 | 32 | 1 | 12.4 | |
Myriagramme, | Mg. | 10000.0 | 154323.56390 | 22 | 1/2 | 14.8 | 321 | 4 | 3.5 |
In writing prescriptions physicians usually consider 1 Gm. as being 15 gr., 4 Ml. (Cc.) as 1 fluidrachm, 30 Ml. (Cc.) as 1 fluidounce.
Table of Comparison between Metric and Apothecaries'
Fluid Measure.
Millihtre (Cubic Centimetre). | Minims. | f℥ | f3 | e |
0.06163 | 1.0 | |||
0.30815 | 5.0 | |||
0.61630 | 10.0 | |||
1.0 | 16.23 | |||
5.0 | 81.15 | 1 | 21.15 | |
10.0 | 162.30 | 2 | 42.3 | |
20.0 | 324.60 | 5 | 24.6 | |
30.0 | 486.90 | l | 0 | 6.9 |
40.0 | 649.20 | l | 2 | 49.2 |
50.0 | 811.50 | l | 5 | 31.5 |
60.0 | 973.80 | 2 | 0 | 13.8 |
70.0 | 1136.10 | 2 | 2 | 56.1 |
80.0 | 1298.40 | 2 | 5 | 38.4 |
90.0 | 1460.70 | 3 | 0 | 20.7 |
100.0 | 1623.00 | 3 | 3 | 3.0 |
250.0 | 4057.50 | 8 | 3 | 37.5 |
500.0 | 8115.00 | 16 | 7 | 15.0 |
1000.0 | 16230.00 | 33 | 6 | 30.0 |
Corresponding Values which should be Memorized by Everyone.
1 millimetre, Mm. (mm.) = 1/25 of an inch. 1 centimetre, Cm. (cm.) =2/5 of an inch. 1 inch = 25 millimetres or 2 1/2 centimetres.
1 cubic centimetre, Cc. (Ml.) = 16.23 minims. 1 fluidounce = 29.53 Cc. (Ml.). 1 gramme, Gm. (gm.) = 15.4324 grains. 1 grain = .0648 gramme. 1 milligramme, Mg. (mg.) = .01543 = 1/64 grain. 1 litre, L. = 34 fluidounces = 2 1/8 pints.
Rule. - To convert grains (whole) into metric, multiply the metric equivalent of 1 grain - 0.0648, by the number of grains in question, say 30, thus 0.0648 X 30 = 1.944 Gm.; for fractions of grains divide the denominator of the fraction into 0.0648, and multiply quotient by numerator - say 1/64 thus 0.0648 ٪ 64 = 0.001 x 1 = 0.001 Gm.
 
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