The stone is a unit of weight that has a particularly rich history, mainly used in the UK and Ireland for human body weight measurement. Originating from the Biblical days, a stone was once standardized by the British Act of Parliament in 1835 to equal 14 pounds. This peculiar unit is still popular in daily life, especially in conversations about body weight or livestock; any Harry Potter fan will recognize Hagrid’s impressive weight mentioned in stones!
An interesting fact is that the symbol for stone “st” doesn’t change forms, much like “lb” for pounds, which can be confusing at first glance. Unlike metric units with their straightforward conversions, the cultural and historical essence of the stone makes it an intriguing part of British heritage, fostering a sense of continuity from medieval markets to modern times.
The “ton” has different meanings depending on where you are in the world. In the United States, the short ton weighs 2,000 pounds, whereas in the United Kingdom, the long ton is slightly heavier at 2,240 pounds. Meanwhile, the metric ton (or tonne) used in most countries around the globe weighs exactly 1,000 kilograms or 2,204.62 pounds, which aligns with the International System of Units.
Interestingly, the term “ton” originated from “tun,” a large cask used to measure wine or ale’s capacity in medieval times. This historical connection signifies not just weight but also volume, reflecting the ton’s versatile application throughout history. Whether measuring ship’s cargo or carbon emissions, the ton continues to be a crucial unit in various fields.
| Stones | Tons |
|---|---|
0
st
|
0
t
|
0.5
st
|
0.0035
t
|
1
st
|
0.007
t
|
1.5
st
|
0.0105
t
|
2
st
|
0.014
t
|
2.5
st
|
0.0175
t
|
3
st
|
0.021
t
|
3.5
st
|
0.0245
t
|
4
st
|
0.028
t
|
4.5
st
|
0.0315
t
|
5
st
|
0.035
t
|
5.5
st
|
0.0385
t
|
6
st
|
0.042
t
|
6.5
st
|
0.0455
t
|
7
st
|
0.049
t
|
7.5
st
|
0.0525
t
|
8
st
|
0.056
t
|
8.5
st
|
0.0595
t
|
9
st
|
0.063
t
|
9.5
st
|
0.0665
t
|
10
st
|
0.07
t
|
10.5
st
|
0.0735
t
|
11
st
|
0.077
t
|
11.5
st
|
0.0805
t
|
12
st
|
0.084
t
|
12.5
st
|
0.0875
t
|
13
st
|
0.091
t
|
13.5
st
|
0.0945
t
|
14
st
|
0.098
t
|
14.5
st
|
0.1015
t
|
15
st
|
0.105
t
|
15.5
st
|
0.1085
t
|
16
st
|
0.112
t
|
16.5
st
|
0.1155
t
|
17
st
|
0.119
t
|
17.5
st
|
0.1225
t
|
18
st
|
0.126
t
|
18.5
st
|
0.1295
t
|
19
st
|
0.133
t
|
19.5
st
|
0.1365
t
|
20
st
|
0.14
t
|
20.5
st
|
0.1435
t
|
21
st
|
0.147
t
|
21.5
st
|
0.1505
t
|
22
st
|
0.154
t
|
22.5
st
|
0.1575
t
|
23
st
|
0.161
t
|
23.5
st
|
0.1645
t
|
24
st
|
0.168
t
|
24.5
st
|
0.1715
t
|
25
st
|
0.175
t
|
25.5
st
|
0.1785
t
|
26
st
|
0.182
t
|
26.5
st
|
0.1855
t
|
27
st
|
0.189
t
|
27.5
st
|
0.1925
t
|
28
st
|
0.196
t
|
28.5
st
|
0.1995
t
|
29
st
|
0.203
t
|
29.5
st
|
0.2065
t
|
30
st
|
0.21
t
|
30.5
st
|
0.2135
t
|
31
st
|
0.217
t
|
31.5
st
|
0.2205
t
|
32
st
|
0.224
t
|
32.5
st
|
0.2275
t
|
33
st
|
0.231
t
|
33.5
st
|
0.2345
t
|
34
st
|
0.238
t
|
34.5
st
|
0.2415
t
|
35
st
|
0.245
t
|
35.5
st
|
0.2485
t
|
36
st
|
0.252
t
|
36.5
st
|
0.2555
t
|
37
st
|
0.259
t
|
37.5
st
|
0.2625
t
|
38
st
|
0.266
t
|
38.5
st
|
0.2695
t
|
39
st
|
0.273
t
|
39.5
st
|
0.2765
t
|
40
st
|
0.28
t
|
40.5
st
|
0.2835
t
|
41
st
|
0.287
t
|
41.5
st
|
0.2905
t
|
42
st
|
0.294
t
|
42.5
st
|
0.2975
t
|
43
st
|
0.301
t
|
43.5
st
|
0.3045
t
|
44
st
|
0.308
t
|
44.5
st
|
0.3115
t
|
45
st
|
0.315
t
|
45.5
st
|
0.3185
t
|
46
st
|
0.322
t
|
46.5
st
|
0.3255
t
|
47
st
|
0.329
t
|
47.5
st
|
0.3325
t
|
48
st
|
0.336
t
|
48.5
st
|
0.3395
t
|
49
st
|
0.343
t
|
49.5
st
|
0.3465
t
|
50
st
|
0.35
t
|
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