A stone is 14 pounds.
Stones to Carats Converter — st to ct
Convert Stone (st) to Carat (ct) using the exact conversion factor (1 stone = 31,751.4659 carat). See the formula, worked examples, conversion table, history, and common uses.
Stones to Carats 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.
A metric carat is exactly 200 milligrams.
Result = input x 6.35029318 / 0.0002.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones to Carats
Weight conversions between Stone and Carat 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
carats = stones × 31751.4659
This factor comes from each unit's defined relationship to the category's base unit: 1 stone equals 6.35029318 base units, and 1 carat equals 0.0002 base units, so dividing one by the other gives the direct stone-to-carat factor of 31751.4659.
Simple example
1 st × 31751.4659 = 31,751.4659 ct
1 stone = 31,751.4659 carats.
Real-world example
50 st × 31751.4659 = 1,587,573.295 ct
50 stones = 1,587,573.295 carats.
Conversion table
| Stone (st) | Carat (ct) |
|---|---|
| 1 st | 31,751.4659 ct |
| 5 st | 158,757.3295 ct |
| 10 st | 317,514.659 ct |
| 25 st | 793,786.6475 ct |
| 50 st | 1,587,573.295 ct |
| 100 st | 3,175,146.59 ct |
Reverse conversion: Carat to Stone
1 ct × 0.00003149460888 = 0.0000314946 st
1 carat = 0.0000314946 stones.
stones = carats × 0.0000314946088836
For a page dedicated to this direction, see Carat 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 Carat (ct)
A metric carat is exactly 200 milligrams.
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 carats are in 1 stone?
1 stone equals 31,751.4659 carats, using the exact defined conversion factor rather than an estimate.
How do I convert stone to carat?
Multiply the stone value by 31751.4659. The converter above does this instantly to whatever precision you set.
How do I convert carat back to stone?
Use the reverse factor: 1 carat equals 0.0000314946 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 carat?
Carat (ct) is a unit of mass/weight.
Is the stone to carat 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)