Many of these units are no longer in common use, but some are holding on:
| Unit | Relative Measure (lb) | Metric Value | Equivalent |
|---|---|---|---|
| grain (gr) | 1/7000 | ≅64.80 mg | 1/7000 lb |
| dram (dr) | 1/256 | ≅1.772 g | 1/16 oz |
| ounce (oz) | 1/16 | ≅28.35 g | 16 dr |
| pound (lb) | 1 | ≅453.6 g | 16 oz |
| quarter (qtr) | 25 | ≅11.34 kg | 25 lb |
| hundredweight (cwt) | 100 | ≅45.36 kg | 4 qtr |
| ton (t) | 2,000 | ≅907.2 kg | 20 cwt |