carats to stone | Exact Decimal + Stone/Pounds

1 Carat = 0.000031 Stone

One stone equals about 31.8 thousand carats (exactly 31751.4659 ct). Real-world use: diamonds and other precious stones; a 1-carat diamond weighs 200 milligrams. This page expresses those values in stones, which is used for body weight in the UK and ireland, where people often report weight in stones and pounds. Use the calculator above, then check the reference table for common values from 0.001 to 1000.

About Carat and Stone

Carat (ct)

A carat is exactly 0.2 grams, the standard unit for gemstone weight.

Where it's used: Diamonds and other precious stones; a 1-carat diamond weighs 200 milligrams.

Stone (st)

A stone is 14 pounds or exactly 6.35029318 kilograms.

Where it's used: Body weight in the UK and Ireland, where people often report weight in stones and pounds.

Weight & Mass Converter

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Precision

Formula

st = ct × 0.000031495

To convert Carat to Stone, use the formula displayed above.

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Carat to Stone: Quick Reference Table

Carat	Stone (Decimal)	Fraction	Real-world equivalent
0.001 ct	3.1495e-8 st	-	fractional unit measurement
0.01 ct	3.1495e-7 st	-	fractional unit measurement
0.1 ct	0.000003 st	-	fractional unit measurement
0.5 ct	0.000016 st	-	fractional unit measurement
1 ct	0.000031 st	-	fractional unit measurement
2 ct	0.000063 st	-	fractional unit measurement
5 ct	0.000157 st	-	fractional unit measurement
10 ct	0.000315 st	-	fractional unit measurement
25 ct	0.000787 st	-	fractional unit measurement
50 ct	0.001575 st	-	fractional unit measurement
100 ct	0.003149 st	-	fractional unit measurement
250 ct	0.007874 st	1/64 st	fractional unit measurement
500 ct	0.015747 st	1/64 st	fractional unit measurement
1000 ct	0.031495 st	1/32 st	fractional unit measurement

ct to st Formula and Examples

Direct Formula st = ct × 0.000031495

Inverse Formula ct = st × 31751.4659

Mental Math Shortcut

Divide the value by roughly 31751.5 to quickly estimate the converted result.

Common Carat to Stone Calculations

5 ct = 0.000157 st
10 ct = 0.000315 st
50 ct = 0.001575 st
100 ct = 0.003149 st
500 ct = 0.015747 st

Precision & Practical Use

For example, 10 ct = 0.000315 st — roughly fractional unit measurement.

Kitchen scales typically resolve to 1 gram or 0.1 oz, while lab and industrial scales go further. Round the converted result to the smallest unit your scale can actually display.

Related Specialist Weight & Mass Calculators & Niche Tools

Standard weight and mass units like kilograms, pounds, grams, and ounces are used globally, but specific industries like culinary baking, metallurgy, and construction logistics demand much more detailed density and structural load conversions.

In culinary arts, baking success relies on converting ingredient weight (grams) from volume (cups, tablespoons) because packing density differs between flour, butter, and white sugar. In heavy fabrication, steel weight calculators estimate raw beam or plate weights based on linear dimensions and metal grades, while rebar calculators determine structural reinforcement loading. For land developers, gravel weight calculators convert volume in cubic yards into tons to estimate hauling weights. Using these specialized weight calculators prevents structural calculation errors and material shipping underestimations.

Flour Cups to Grams Convert baking flour cups to grams. Butter Cups to Grams Convert baking butter cups to grams. Pounds & Ounces to kg Convert compound weight measurements. Steel Weight Calc Estimate steel bar or plate weights. Rebar Weight Calc Calculate rebar linear weights and sizing. Gravel Weight Tons/Yards Convert gravel volume to tons weight.

How to Convert Carat to Stone

How many stones are in one carat?

One Carat (ct) equals 0.000031 Stone (st). To convert carats to stones, multiply the carat value by 0.000031.

How do I convert Carat to Stone?

Multiply your carat value by 0.000031 to get the result in Stone: st = ct × 0.000031. For example, 5 ct = 0.000157 st.

What is the formula for converting ct to st?

The conversion formula is st = ct × 0.000031. Use the calculator above for any value, and see the reference table below for common inputs from 0.001 to 1000.

Is there a quick mental estimate for ct to st?