Roman
smaller units of mass

             

libra

           

uncia

12

       

sicilicus

4

48

     

sextula

6

72

     

drachma

1 1/3

2

8

96

 

scripulum

3

4

6

24

288

obolus

2

6

8

12

48

576

siliqua

3

6

18

24

36

144

1728

189
mg

570
mg

1.14
g

3.41
g

4.55
g

6.82
g

27.3
g

327.5
g

The libra, which was the unit of mass of commerce, and its subdivisions, should be distinguished from the as, the monetary pound, and its subdivisions, many of which have the same names as units of mass. The mass of the as fell rather steadily. All the conversions are in grams.

                     

as

                   

semis

2

                 

triens

3

             

quadrans

1 1/3

2

4

           

sextans

2

3

6

         

sesuncia

1 1/3

2

2 2/3

4

8

       

uncia

2

3

4

6

12

   

semuncia

2

3

4

6

8

12

24

   

sicilicus

2

4

6

8

12

16

24

48

 

sextula

3

6

9

12

18

24

36

72

 

scripulum

4

6

12

24

36

48

72

96

144

288

aes grave, = 1 libra;
280-242 bce

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

327
g

280-276 bce

 

 

 

 

 

 

 

 

 

 

322

275-270 bce

 

 

 

 

 

 

 

 

 

 

331

269-266 bce

 

 

 

 

 

 

 

 

 

 

265

265-242 bce

 

 

 

 

 

 

 

 

 

 

270

241-235 bce

 

 

 

 

 

 

 

 

 

 

272

230-226 bce

 

 

 

 

 

 

 

 

 

 

266

225-217 bce

 

 

 

 

 

 

 

 

 

 

268

as = ½ libra;
217-214 bce

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

163.5
 

as = ¼ libra;
214-211 bce

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

81.75
 

as = 1/6 libra;
211-141 bce

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

54.6
 

as = 1/12 libra;
141-91 bce

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

27.3
 

as = 1/24 libra;
91 bce

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

13.7
 

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