carats to kg | Exact Decimal + Stone/Pounds

1 Carat = 0.0002 Kilogram

One kilogram equals exactly 5,000 carats — a fixed ratio you can memorize. Real-world use: diamonds and other precious stones; a 1-carat diamond weighs 200 milligrams. This page expresses those values in kilograms, which is used for body weight, groceries, shipping weights, and scientific mass measurements worldwide. Type a value above for an instant answer; the exact formula and the reference table are below.

About Carat and Kilogram

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.

Kilogram (kg)

The kilogram is the SI base unit of mass, defined by the Planck constant and represented by a platinum-iridium prototype historically.

Where it's used: Body weight, groceries, shipping weights, and scientific mass measurements worldwide.

Weight & Mass Converter

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Precision

Formula

kg = ct × 0.0002

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

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Carat to Kilogram: Quick Reference Table

Carat	Kilogram (Decimal)	Fraction	Real-world equivalent
0.001 ct	2.0000e-7 kg	-	weight of a lemon
0.01 ct	0.000002 kg	-	weight of a lemon
0.1 ct	0.00002 kg	-	weight of a lemon
0.5 ct	0.0001 kg	-	weight of a lemon
1 ct	0.0002 kg	-	weight of a lemon
2 ct	0.0004 kg	-	weight of a lemon
5 ct	0.001 kg	-	weight of a lemon
10 ct	0.002 kg	-	weight of a lemon
25 ct	0.005 kg	-	weight of a lemon
50 ct	0.01 kg	1/64 kg	weight of a lemon
100 ct	0.02 kg	1/64 kg	weight of a lemon
250 ct	0.05 kg	3/64 kg	weight of a lemon
500 ct	0.1 kg	3/32 kg	weight of a soccer ball
1000 ct	0.2 kg	13/64 kg	weight of a soccer ball

ct to kg Formula and Examples

Direct Formula kg = ct × 0.0002

Inverse Formula ct = kg × 5000

Mental Math Shortcut

Divide the value by roughly 5000 to quickly estimate the converted result.

Common Carat to Kilogram Calculations

5 ct = 0.001 kg
10 ct = 0.002 kg
50 ct = 0.01 kg
100 ct = 0.02 kg
500 ct = 0.1 kg

Precision & Practical Use

For example, 10 ct = 0.002 kg — roughly weight of a lemon.

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 Kilogram

How many kilograms are in one carat?

One Carat (ct) equals 0.0002 Kilogram (kg). To convert carats to kilograms, multiply the carat value by 0.0002.

How do I convert Carat to Kilogram?

Multiply your carat value by 0.0002 to get the result in Kilogram: kg = ct × 0.0002. For example, 5 ct = 0.001 kg.

What is the formula for converting ct to kg?

The conversion formula is kg = ct × 0.0002. 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 kg?