Avoirdupois Weight:
| 437.5 grains | = | 1 oz. |
| 16 oz. | = | 1 lb |
| 2000 lbs. | = | 1 ton |
| 2240 lbs. | = | 1 long ton |
Troy Weight:
| 24 grains | = | 1 pennyweight |
| 20 pennyweights | = | 1 ounce |
| 12 ounces | = | 1 pound |
| 480 grains | = | 1 ounce |
This system seems to be designed to cheat people by overlapping labeling. There are 7000 grains in an avoirdupois pound, and 5760 grains in a troy pound. This means that if you were in 19th century England and purchase tea, a dishonest seller has one pound by troy weight you are cheated, but he sells you an ounce by troy weight he cheats himself out of 42.5 grains.
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