England
wool weights

Using the pound avoirdupois
 

last

by 14 Edward III Stat 1 c21, 1340    

sack(wool)

12

       

wey

2

24

     

hundredweight

1 5/8

39

     

tod

4

13

156

   

stone

2

8

13

26

312

clove or nail

2

4

16

26

52

624

pound av.

7

14

28

112

182

364

4368

453.59 g

3.18 kg

6.35 kg

12.70 kg

50.80 kg

82.6 kg

165.1 kg

1981.3 kg

The pound avoirdupois = 16 ounces avoirdupois = 7000 Troy grains.


using the libra mercatoria
       

last

           

sack (wool)

6

       

wey

2

12

 as late as 14th c    

hundredweight

2

3�

39

     

tod

4

8

13

156

   

stone

2

8

14

28

168

clove or nail

2

4

@16

32

52

624

London pound

12½

25

100

175

350

2100

466.55 g

 kg

 kg

 kg

 kg

 kg

 163.29 kg

 kg

libra mercatoria or London pound = 15 Troy ounces = 7200 Troy grains.


Using the libra mercatoria

 

       

last

           

sack (wool)

6

       

wey

@2

12

13th c, stone enlarged to 13 lbs

hundredweight

21

     

tod

4

7

14

84

   

stone

2

8

14

@28

168

clove or nail

2

4

@16

28

56

336

London pound

@6½

@13

26

104

182

@364

2184

466.55 g

 kg

 kg

 kg

 kg

 kg

 169.82 kg

 kg

libra mercatoria or London pound = 15 Troy ounces = 7200 Troy grains.

 

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