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.
A metric tonne, often simply referred to as a “tonne,” is a standard unit of mass equivalent to 1,000 kilograms, or approximately 2,204.62 pounds. Interestingly, the term “tonne” derives from the Old French word “tonne,” meaning a large cask, reflecting its historical use in trade and shipping. Unlike the imperial ton, which is usually used in the United States and equals 2,000 pounds, the metric tonne is part of the International System of Units (SI), making it a globally recognized measure, especially in trade and scientific communities.
The widespread adoption of the metric tonne simplifies international commerce, with industries like shipping and logistics relying heavily on its uniformity. Its use extends beyond everyday contexts; for instance, when scientists discuss carbon emissions or agricultural yields, they often quantify their findings in metric tonnes, emphasizing its crucial role in global environmental and economic assessments.
| Stones | Metric Tonnes |
|---|---|
0
st
|
0
mt
|
0.5
st
|
0.00317515
mt
|
1
st
|
0.00635029
mt
|
1.5
st
|
0.00952544
mt
|
2
st
|
0.0127006
mt
|
2.5
st
|
0.0158757
mt
|
3
st
|
0.0190509
mt
|
3.5
st
|
0.022226
mt
|
4
st
|
0.0254012
mt
|
4.5
st
|
0.0285763
mt
|
5
st
|
0.0317515
mt
|
5.5
st
|
0.0349266
mt
|
6
st
|
0.0381018
mt
|
6.5
st
|
0.0412769
mt
|
7
st
|
0.0444521
mt
|
7.5
st
|
0.0476272
mt
|
8
st
|
0.0508023
mt
|
8.5
st
|
0.0539775
mt
|
9
st
|
0.0571526
mt
|
9.5
st
|
0.0603278
mt
|
10
st
|
0.0635029
mt
|
10.5
st
|
0.0666781
mt
|
11
st
|
0.0698532
mt
|
11.5
st
|
0.0730284
mt
|
12
st
|
0.0762035
mt
|
12.5
st
|
0.0793787
mt
|
13
st
|
0.0825538
mt
|
13.5
st
|
0.085729
mt
|
14
st
|
0.0889041
mt
|
14.5
st
|
0.0920793
mt
|
15
st
|
0.0952544
mt
|
15.5
st
|
0.0984295
mt
|
16
st
|
0.101605
mt
|
16.5
st
|
0.10478
mt
|
17
st
|
0.107955
mt
|
17.5
st
|
0.11113
mt
|
18
st
|
0.114305
mt
|
18.5
st
|
0.11748
mt
|
19
st
|
0.120656
mt
|
19.5
st
|
0.123831
mt
|
20
st
|
0.127006
mt
|
20.5
st
|
0.130181
mt
|
21
st
|
0.133356
mt
|
21.5
st
|
0.136531
mt
|
22
st
|
0.139706
mt
|
22.5
st
|
0.142882
mt
|
23
st
|
0.146057
mt
|
23.5
st
|
0.149232
mt
|
24
st
|
0.152407
mt
|
24.5
st
|
0.155582
mt
|
25
st
|
0.158757
mt
|
25.5
st
|
0.161932
mt
|
26
st
|
0.165108
mt
|
26.5
st
|
0.168283
mt
|
27
st
|
0.171458
mt
|
27.5
st
|
0.174633
mt
|
28
st
|
0.177808
mt
|
28.5
st
|
0.180983
mt
|
29
st
|
0.184159
mt
|
29.5
st
|
0.187334
mt
|
30
st
|
0.190509
mt
|
30.5
st
|
0.193684
mt
|
31
st
|
0.196859
mt
|
31.5
st
|
0.200034
mt
|
32
st
|
0.203209
mt
|
32.5
st
|
0.206385
mt
|
33
st
|
0.20956
mt
|
33.5
st
|
0.212735
mt
|
34
st
|
0.21591
mt
|
34.5
st
|
0.219085
mt
|
35
st
|
0.22226
mt
|
35.5
st
|
0.225435
mt
|
36
st
|
0.228611
mt
|
36.5
st
|
0.231786
mt
|
37
st
|
0.234961
mt
|
37.5
st
|
0.238136
mt
|
38
st
|
0.241311
mt
|
38.5
st
|
0.244486
mt
|
39
st
|
0.247661
mt
|
39.5
st
|
0.250837
mt
|
40
st
|
0.254012
mt
|
40.5
st
|
0.257187
mt
|
41
st
|
0.260362
mt
|
41.5
st
|
0.263537
mt
|
42
st
|
0.266712
mt
|
42.5
st
|
0.269887
mt
|
43
st
|
0.273063
mt
|
43.5
st
|
0.276238
mt
|
44
st
|
0.279413
mt
|
44.5
st
|
0.282588
mt
|
45
st
|
0.285763
mt
|
45.5
st
|
0.288938
mt
|
46
st
|
0.292113
mt
|
46.5
st
|
0.295289
mt
|
47
st
|
0.298464
mt
|
47.5
st
|
0.301639
mt
|
48
st
|
0.304814
mt
|
48.5
st
|
0.307989
mt
|
49
st
|
0.311164
mt
|
49.5
st
|
0.31434
mt
|
50
st
|
0.317515
mt
|
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