Table of Comparison between Metric, Avoirdupois, and Apothecaries Weights

Names.

Numerical Expressions.

Equivalents in Grains.

Equivalents in

Avoirdupois

Weight.

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.