24 gr. = 1 pwt. 16 oz. = 1 lb. .001 milligram
20 pwt. = 1 oz. 112 lb. = 1 cwt. .01 centigram
12 oz. = 1 lb. 20 cwt. = 1 ton .1 decigram
5760 gr. = 1 lb. 2240 lb. = 1 long ton 1. gram
2000 lb. = 1 short ton 10. dekigram
100 lb. = 1 short cwt. 100. hectogram
7000 gr. = 1 lb. 1000. kilogram
In surface measurements, the same differences are seen: