A stone is 14 pounds.
Stones to Imperial hundredweights Converter — st to long cwt
Convert Stone (st) to Imperial hundredweight (long cwt) using the exact conversion factor (1 stone = 0.125 imperial hundredweight). See the formula, worked examples, conversion table, history, and common uses.
Stones to Imperial hundredweights converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
An imperial long hundredweight is 112 pounds.
Result = input x 6.35029318 / 50.80234544.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones to Imperial hundredweights
Weight conversions between Stone and Imperial hundredweight come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Stone is most often used for body weight reporting in the uk and ireland (e.g. '12 stone 5 pounds').
Formula
imperial hundredweights = stones × 0.125
This factor comes from each unit's defined relationship to the category's base unit: 1 stone equals 6.35029318 base units, and 1 imperial hundredweight equals 50.80234544 base units, so dividing one by the other gives the direct stone-to-imperial hundredweight factor of 0.125.
Simple example
1 st × 0.125 = 0.125 long cwt
1 stone = 0.125 imperial hundredweights.
Real-world example
50 st × 0.125 = 6.25 long cwt
50 stones = 6.25 imperial hundredweights.
Conversion table
| Stone (st) | Imperial hundredweight (long cwt) |
|---|---|
| 1 st | 0.125 long cwt |
| 5 st | 0.625 long cwt |
| 10 st | 1.25 long cwt |
| 25 st | 3.125 long cwt |
| 50 st | 6.25 long cwt |
| 100 st | 12.5 long cwt |
Reverse conversion: Imperial hundredweight to Stone
0.125 long cwt × 8 = 1 st
0.125 imperial hundredweights = 1 stone.
stones = imperial hundredweights × 8
For a page dedicated to this direction, see Imperial hundredweight to Stone.
Understanding the Stone
Stone (st) measures mass. A stone is 14 pounds: exactly 6.35029318 kilograms. It is classified as a UK customary unit.
Where it's used: United Kingdom and Ireland (body weight)
Uses of the Stone today
- Body weight reporting in the UK and Ireland (e.g. '12 stone 5 pounds')
- Historical wool and agricultural produce weighing
History of the Stone
The stone dates to medieval England as a general-purpose weight unit, historically varying by region and commodity (a 'stone' of wool differed from a 'stone' of meat) before settling on 14 pounds for general use. It remains in everyday use for body weight in the UK and Ireland, unlike most other English customary units which have been replaced or supplemented by metric measures.
Historical origin. Stone was not the invention of a single named person; it developed through the process described above.
Understanding the Imperial hundredweight (long cwt)
An imperial long hundredweight is 112 pounds.
Stone — sources
- UK Weights and Measures Act 1985 — Confirms the stone (14 lb) as a legally recognized UK unit for body weight.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many imperial hundredweights are in 1 stone?
1 stone equals 0.125 imperial hundredweights, using the exact defined conversion factor rather than an estimate.
How do I convert stone to imperial hundredweight?
Multiply the stone value by 0.125. The converter above does this instantly to whatever precision you set.
How do I convert imperial hundredweight back to stone?
Use the reverse factor: 1 imperial hundredweight equals 8 stones. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone?
Stone (st) measures mass. A stone is 14 pounds: exactly 6.35029318 kilograms. It is classified as a UK customary unit.
What is a imperial hundredweight?
Imperial hundredweight (long cwt) is a unit of mass/weight.
Is the stone to imperial hundredweight conversion exact?
Yes. A stone is 14 pounds: exactly 6.35029318 kilograms. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the stone still used today?
United Kingdom and Ireland (body weight)