A stone is a unit of weight used primarily in the United Kingdom and Ireland to measure body weight. One stone equals 14 pounds or approx. 6.35 kilograms. It's not part of the official metric or imperial systems, but it remains a widely recognized standard in health, fitness, and everyday conversation in the UK. If someone says they weigh "11 stone," they mean 154 pounds (11 × 14).
The stone has historical roots going back to ancient Europe, where stones of specific weight were used in trade. Over time, England standardized the stone to mean 14 pounds in 1835, and that value is still used today. While most countries have adopted the metric system, the stone remains part of British culture—primarily when referring to personal weight.
How is the Stone Used: The stone is most commonly used to express body weight in the UK and Ireland. You'll often hear weights given in stone and pounds together, like "11 stone 4 pounds" instead of 158 pounds or 71.6 kg. It's rarely used in scientific, industrial, or commercial applications today. The metric system has replaced it in those contexts.
The Imperial ton, also known as the long ton, is a unit of mass used primarily in the United Kingdom and other Commonwealth countries. One imperial ton is equal to 2,240 pounds, or approximately 1,016.05 kilograms. This makes it heavier than both the US ton (short ton, 2,000 pounds) and the metric tonne (1,000 kilograms).
The imperial ton originated in the British Imperial system and dates back to times when goods were transported in large barrels or "tuns." These barrels typically held about 2,240 pounds of product—hence the origin of the long ton.
The unit was officially adopted as part of the British Imperial system in the 19th century. Though it's no longer widely used in trade or industry, it still appears in naval shipping, mining, and some historical references in the UK.
How Is the Imperial Ton Used: Today, the imperial ton is used less frequently due to the global adoption of the metric system. However, it remains relevant in:
1 st = 0.00625 Imperial ton
Let’s say you want to convert 100 st to Imperial ton.
Using the formula:
100 × 0.00625 = 0.625 Imperial ton
So, 100 st is approximately 0.625 Imperial ton.
| Stone (st) | Imperial Ton (Imperial ton) |
|---|---|
| 1 st | 0.006 Imperial ton |
| 2 st | 0.013 Imperial ton |
| 3 st | 0.019 Imperial ton |
| 4 st | 0.025 Imperial ton |
| 5 st | 0.031 Imperial ton |
| 6 st | 0.038 Imperial ton |
| 7 st | 0.044 Imperial ton |
| 8 st | 0.05 Imperial ton |
| 9 st | 0.056 Imperial ton |
| 10 st | 0.063 Imperial ton |
| 11 st | 0.069 Imperial ton |
| 12 st | 0.075 Imperial ton |
| 13 st | 0.081 Imperial ton |
| 14 st | 0.088 Imperial ton |
| 15 st | 0.094 Imperial ton |