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 t = 5,000,000 ct
1 ct = 2.0000e-7 t
例子:
将15 公吨转换为克拉：
15 t = 75,000,000 ct
| 公吨 | 克拉 |
|---|---|
| 0.01 t | 50,000 ct |
| 0.1 t | 500,000 ct |
| 1 t | 5,000,000 ct |
| 2 t | 10,000,000 ct |
| 3 t | 15,000,000 ct |
| 5 t | 25,000,000 ct |
| 10 t | 50,000,000 ct |
| 20 t | 100,000,000 ct |
| 30 t | 150,000,000 ct |
| 40 t | 200,000,000 ct |
| 50 t | 250,000,000 ct |
| 60 t | 300,000,000 ct |
| 70 t | 350,000,000 ct |
| 80 t | 400,000,000 ct |
| 90 t | 450,000,000 ct |
| 100 t | 500,000,000 ct |
| 250 t | 1,250,000,000 ct |
| 500 t | 2,500,000,000 ct |
| 750 t | 3,750,000,000 ct |
| 1000 t | 5,000,000,000 ct |
| 10000 t | 50,000,000,000 ct |
| 100000 t | 500,000,000,000 ct |
规则