La unitat fonamental és la lliura avoirdupois de 16 unces, equivalent a 453,592 g.
Unitats avoirdupois i equivalències
unitat d’avoirdupois |
símbol |
valor en unitats avdp submúltiples |
valor en unitats avdp en lliures |
equivalència en unitats mètriques |
|---|---|---|---|---|
| 1 grain | [gr] | - | 1/7000 | 64,79892 mg |
| 1 dram | [drm] | 27,34375 gr | 1/256 | 1,771845 g |
| 1 ounce | [oz] | 16 drm | 1/16 | 28,34953 g |
| 1 pound (lliura) | [lb] | 16 oz | 1 | 0,4535924 kg |
| 1 stone | [st] | 224 oz | 14 | 6,350294 kg |
| 1 quarter | [qr] | 2 st | 28 | 12,70059 kg |
| 1 central o new hundredweight | [ctl] | 1600 oz | 100 | 45,35924 kg |
| 1 hundredweight o centweight | [cwt] | 8 st | 112 | 50,80235 kg |
| 1 short ton | [s tn] | 20 ctl | 2000 | 907,1849 kg |
| 1 (long) ton | [tn] | 20 cwt | 2240 | 1016,047 kg |