| Carats | Long Hundredweights (UK) |
| 1 ct | 3.9368265320062E-6 cwt long |
| 2 ct | 7.8736530640124E-6 cwt long |
| 3 ct | 1.1810479596019E-5 cwt long |
| 4 ct | 1.5747306128025E-5 cwt long |
| 5 ct | 1.9684132660031E-5 cwt long |
| 6 ct | 2.3620959192037E-5 cwt long |
| 7 ct | 2.7557785724043E-5 cwt long |
| 8 ct | 3.149461225605E-5 cwt long |
| 9 ct | 3.5431438788056E-5 cwt long |
| 10 ct | 3.9368265320062E-5 cwt long |
| 11 ct | 4.3305091852068E-5 cwt long |
| 12 ct | 4.7241918384074E-5 cwt long |
| 13 ct | 5.1178744916081E-5 cwt long |
| 14 ct | 5.5115571448087E-5 cwt long |
| 15 ct | 5.9052397980093E-5 cwt long |
| 16 ct | 6.2989224512099E-5 cwt long |
| 17 ct | 6.6926051044105E-5 cwt long |
| 18 ct | 7.0862877576112E-5 cwt long |
| 19 ct | 7.4799704108118E-5 cwt long |
| 20 ct | 7.8736530640124E-5 cwt long |