质量是物理中物质的数量。它是物质的基本特性，以千克（kg）进行测量。
1 st = 31,751.45 ct
1 ct = 3.1495e-5 st
例子:
将15 石头转换为克拉：
15 st = 476,271.75 ct
| 石头 | 克拉 |
|---|---|
| 0.01 st | 317.515 ct |
| 0.1 st | 3,175.145 ct |
| 1 st | 31,751.45 ct |
| 2 st | 63,502.9 ct |
| 3 st | 95,254.35 ct |
| 5 st | 158,757.25 ct |
| 10 st | 317,514.5 ct |
| 20 st | 635,029 ct |
| 30 st | 952,543.5 ct |
| 40 st | 1,270,058 ct |
| 50 st | 1,587,572.5 ct |
| 60 st | 1,905,087 ct |
| 70 st | 2,222,601.5 ct |
| 80 st | 2,540,116 ct |
| 90 st | 2,857,630.5 ct |
| 100 st | 3,175,145 ct |
| 250 st | 7,937,862.5 ct |
| 500 st | 15,875,725 ct |
| 750 st | 23,813,587.5 ct |
| 1000 st | 31,751,450 ct |
| 10000 st | 317,514,500 ct |
| 100000 st | 3,175,145,000 ct |
规则