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 = 4,083.331 dwt
1 dwt = 0 st
例子:
将15 石头转换为轻量级：
15 st = 61,249.969 dwt
| 石头 | 轻量级 |
|---|---|
| 0.01 st | 40.833 dwt |
| 0.1 st | 408.333 dwt |
| 1 st | 4,083.331 dwt |
| 2 st | 8,166.663 dwt |
| 3 st | 12,249.994 dwt |
| 5 st | 20,416.656 dwt |
| 10 st | 40,833.313 dwt |
| 20 st | 81,666.626 dwt |
| 30 st | 122,499.939 dwt |
| 40 st | 163,333.252 dwt |
| 50 st | 204,166.564 dwt |
| 60 st | 244,999.877 dwt |
| 70 st | 285,833.19 dwt |
| 80 st | 326,666.503 dwt |
| 90 st | 367,499.816 dwt |
| 100 st | 408,333.129 dwt |
| 250 st | 1,020,832.822 dwt |
| 500 st | 2,041,665.644 dwt |
| 750 st | 3,062,498.466 dwt |
| 1000 st | 4,083,331.289 dwt |
| 10000 st | 40,833,312.885 dwt |
| 100000 st | 408,333,128.855 dwt |
规则