How to convert stone to carats
To convert a measurement in stone to carats, multiply the value by 31,751.4659. The conversion factor comes from the relationship between both units and the kilogram.
For example, to convert 5 st to carats: 5 × 31,751.4659 = 158,757.3295 ct.
What is a stone?
A stone is a British imperial unit of mass equal to 14 pounds or exactly 6.35029318 kilograms. The stone was historically used across Europe with regionally varying values before Britain standardized it at 14 pounds. It remains in everyday use in the UK and Ireland for body weight despite metrication.
Common uses of stone include: Body weight in the UK and Ireland; Weigh-ins for sports and fitness in Britain; Historical and livestock weight references; Everyday conversational weight in the British Isles.
What is a carat?
A carat is a unit of mass for gemstones equal to exactly 200 milligrams (0.2 grams). The carat takes its name from the carob seed, once used as a counterweight for weighing gems. The metric carat of exactly 200 mg was adopted internationally in the early 20th century to standardize the gem trade.
Common uses of carats include: Diamond and gemstone weight; Jewelry pricing and grading; Pearl and precious stone trading; Gemological certification.
Stone to carats worked examples
Here are some common values converted:
1 st = 31,751.4659 ct 5 st = 158,757.3295 ct 10 st = 317,514.659 ct 50 st = 1,587,573.295 ct 100 st = 3,175,146.59 ct
Frequently asked questions
How many carats are in one stone?
One stone (st) equals 31,751.4659 carats (ct). Multiply any value in stone by 31,751.4659 to convert to carats.
How do I convert stone to carats?
Multiply the value in stone by 31,751.4659. For example, 5 st × 31,751.4659 = 158,757.3295 ct.
How do I convert carats to stone?
Multiply the value in carats by 0.000031494609, or divide by 31,751.4659. Use the swap button on the converter above to reverse the direction.
Is the stone to carat conversion exact?
Yes. Since 1959 the international pound is defined as exactly 0.45359237 kg, so all weight conversions between metric and avoirdupois units use exact factors.
What is the formula for stone to carats?
The formula is: ct = st × 31,751.4659. This comes from the definition of both units relative to the kilogram.