Convert stones to carats

1 st=31,751.47ct

Use the converter below to change any stones value into carats instantly — with formula, conversion table, and real-world examples.

You have

Equals

31,751.47

Conversion formula

Forward

carats = stones × 31,751.47

Reverse

stones = carats × 3.1495e-5

Example: 10 st × 31,751.47 = 317,514.66 ct.

About both units

From

Stone

The stone equals 14 pounds or 6.35 kilograms. It is used almost exclusively in the UK and Ireland to express human body weight. A 70 kg person is described as "11 stone" in British English. The stone is not used in trade, science or any other context.

Real-world: A 70 kg adult is about 11 stone. A British NHS weight chart marks stones alongside kg. A heavyweight boxer over 14 stone is typical.

Read full stone reference →

Carat

The metric carat equals 200 milligrams exactly. It is the standard unit for gemstone weight — diamonds, rubies, sapphires and emeralds are sold by the carat. Do not confuse with the purity carat (karat) used for gold (24K = pure gold).

Real-world: A 1-carat diamond weighs 200 mg and is typically 6.5 mm across. The Hope Diamond is 45.52 carats (9.1 g).

Read full carat reference →

Stone to Carat conversion table

Common stones to carats values for quick reference.

Stone (st)	Carat (ct)
1 st	31,751.47 ct
5 st	158,757.33 ct
10 st	317,514.66 ct
25 st	793,786.65 ct
50 st	1,587,573.3 ct
100 st	3,175,146.59 ct
250 st	7,937,866.48 ct
500 st	15,875,732.95 ct
1,000 st	31,751,465.9 ct
5,000 st	158,757,329.5 ct

Tips & common mistakes

Quick tips

1 stone = 14 lb = 6.35 kg exactly.
British speakers often say "11 stone 4" meaning 11 stone and 4 pounds — not 11.4 stone.
Multiply stones by 6.35 for a precise kg conversion.

Avoid these

Reading "11 stone 4" as 11.4 stone — it is 11 × 14 + 4 = 158 lb.
Using stones outside UK/Ireland contexts — audiences elsewhere will not understand.
Multiplying by 6 instead of 6.35 for a quick kg estimate — 5% error.

Frequently asked questions

How many carats in a stone?

One stone equals 31,751.47 carats.

How do I convert stones to carats?

Multiply the stone value by 31,751.47 to get the equivalent in carats.

What is 100 stones in carats?

100 stones equals 3,175,146.59 carats.

Is a stone bigger than a carat?

Yes. 1 stone equals 31,751.47 carats, so one stone is larger.

How to convert stones to carats without a calculator?

Multiply by 31,751.47 for a quick estimate; use a calculator for precise results.

Related weight conversions

📊 See full comparison matrix →

Conversions in other categories

LengthKilometer → Mile TemperatureCelsius → Fahrenheit VolumeLiter → US Gallon AreaSquare Meter → Square Foot SpeedKilometer per Hour → Mile per Hour EnergyKilojoule → Kilocalorie PressureBar → Pound per Square Inch PowerKilowatt → Mechanical Horsepower