The ounce is a fascinating unit with a rich history, dating back to Ancient Rome. The term “ounce” is derived from the Latin word “uncia,” meaning “one-twelfth.” Originally used by the Romans as a unit of weight, an uncia represented one-twelfth of a Roman pound. The versatility of the ounce becomes even more intriguing when you consider its application in both weight and volume measurements today.
In the realm of precious metals, such as gold and silver, the term “troy ounce” is used, which is approximately 10% heavier than the customary ounce. Meanwhile, in British imperial and American systems, an ounce can denote both dry and liquid measurements. The fluid ounce, however, differs slightly between the UK and the US, with the UK fluid ounce being approximately 28.4 milliliters and the US at about 29.6 milliliters. This multifaceted unit highlights how historical roots continue to influence modern measurement systems worldwide.
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.
| Ounces | Stones |
|---|---|
0
oz
|
0
st
|
1
oz
|
0.00446429
st
|
2
oz
|
0.00892857
st
|
3
oz
|
0.0133929
st
|
4
oz
|
0.0178571
st
|
5
oz
|
0.0223214
st
|
6
oz
|
0.0267857
st
|
7
oz
|
0.03125
st
|
8
oz
|
0.0357143
st
|
9
oz
|
0.0401786
st
|
10
oz
|
0.0446429
st
|
11
oz
|
0.0491071
st
|
12
oz
|
0.0535714
st
|
13
oz
|
0.0580357
st
|
14
oz
|
0.0625
st
|
15
oz
|
0.0669643
st
|
16
oz
|
0.0714286
st
|
17
oz
|
0.0758929
st
|
18
oz
|
0.0803571
st
|
19
oz
|
0.0848214
st
|
20
oz
|
0.0892857
st
|
21
oz
|
0.09375
st
|
22
oz
|
0.0982143
st
|
23
oz
|
0.102679
st
|
24
oz
|
0.107143
st
|
25
oz
|
0.111607
st
|
26
oz
|
0.116071
st
|
27
oz
|
0.120536
st
|
28
oz
|
0.125
st
|
29
oz
|
0.129464
st
|
30
oz
|
0.133929
st
|
31
oz
|
0.138393
st
|
32
oz
|
0.142857
st
|
33
oz
|
0.147321
st
|
34
oz
|
0.151786
st
|
35
oz
|
0.15625
st
|
36
oz
|
0.160714
st
|
37
oz
|
0.165179
st
|
38
oz
|
0.169643
st
|
39
oz
|
0.174107
st
|
40
oz
|
0.178571
st
|
41
oz
|
0.183036
st
|
42
oz
|
0.1875
st
|
43
oz
|
0.191964
st
|
44
oz
|
0.196429
st
|
45
oz
|
0.200893
st
|
46
oz
|
0.205357
st
|
47
oz
|
0.209821
st
|
48
oz
|
0.214286
st
|
49
oz
|
0.21875
st
|
50
oz
|
0.223214
st
|
51
oz
|
0.227679
st
|
52
oz
|
0.232143
st
|
53
oz
|
0.236607
st
|
54
oz
|
0.241071
st
|
55
oz
|
0.245536
st
|
56
oz
|
0.25
st
|
57
oz
|
0.254464
st
|
58
oz
|
0.258929
st
|
59
oz
|
0.263393
st
|
60
oz
|
0.267857
st
|
61
oz
|
0.272321
st
|
62
oz
|
0.276786
st
|
63
oz
|
0.28125
st
|
64
oz
|
0.285714
st
|
65
oz
|
0.290179
st
|
66
oz
|
0.294643
st
|
67
oz
|
0.299107
st
|
68
oz
|
0.303571
st
|
69
oz
|
0.308036
st
|
70
oz
|
0.3125
st
|
71
oz
|
0.316964
st
|
72
oz
|
0.321429
st
|
73
oz
|
0.325893
st
|
74
oz
|
0.330357
st
|
75
oz
|
0.334821
st
|
76
oz
|
0.339286
st
|
77
oz
|
0.34375
st
|
78
oz
|
0.348214
st
|
79
oz
|
0.352679
st
|
80
oz
|
0.357143
st
|
81
oz
|
0.361607
st
|
82
oz
|
0.366071
st
|
83
oz
|
0.370536
st
|
84
oz
|
0.375
st
|
85
oz
|
0.379464
st
|
86
oz
|
0.383929
st
|
87
oz
|
0.388393
st
|
88
oz
|
0.392857
st
|
89
oz
|
0.397321
st
|
90
oz
|
0.401786
st
|
91
oz
|
0.40625
st
|
92
oz
|
0.410714
st
|
93
oz
|
0.415179
st
|
94
oz
|
0.419643
st
|
95
oz
|
0.424107
st
|
96
oz
|
0.428571
st
|
97
oz
|
0.433036
st
|
98
oz
|
0.4375
st
|
99
oz
|
0.441964
st
|
100
oz
|
0.446429
st
|
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