carats to grams | Exact Decimal + Stone/Pounds

1 Carat = 0.2 Gram

One gram equals exactly 5 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 grams, which is used for nutrition labels, jewelry, cooking ingredient weights, and postal rates for small items. Use the calculator above, then check the reference table for common values from 0.001 to 1000.

About Carat and Gram

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.

Gram (g)

A gram is one-thousandth of a kilogram, about the weight of a paperclip.

Where it's used: Nutrition labels, jewelry, cooking ingredient weights, and postal rates for small items.

Weight & Mass Converter

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Precision

Formula

g = ct × 0.2

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

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Carat to Gram: Quick Reference Table

Carat	Gram (Decimal)	Fraction	Real-world equivalent
0.001 ct	0.0002 g	-	weight of a paperclip
0.01 ct	0.002 g	-	weight of a paperclip
0.1 ct	0.02 g	1/64 g	weight of a paperclip
0.5 ct	0.1 g	3/32 g	weight of a paperclip
1 ct	0.2 g	13/64 g	weight of a paperclip
2 ct	0.4 g	13/32 g	weight of a paperclip
5 ct	1 g	-	weight of a penny
10 ct	2 g	-	weight of a penny
25 ct	5 g	-	weight of a AAA battery
50 ct	10 g	-	weight of a AAA battery
100 ct	20 g	-	weight of a deck of cards
250 ct	50 g	-	weight of a deck of cards
500 ct	100 g	-	weight of a tablet device
1000 ct	200 g	-	weight of a tablet device

ct to g Formula and Examples

Direct Formula g = ct × 0.2

Inverse Formula ct = g × 5

Mental Math Shortcut

Divide the value by roughly 5 to quickly estimate the converted result.

Common Carat to Gram Calculations

5 ct = 1 g
10 ct = 2 g
50 ct = 10 g
100 ct = 20 g
500 ct = 100 g

Precision & Practical Use

For example, 10 ct = 2 g — roughly weight of a penny.

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 Gram

How many grams are in one carat?

One Carat (ct) equals 0.2 Gram (g). To convert carats to grams, multiply the carat value by 0.2.

How do I convert Carat to Gram?

Multiply your carat value by 0.2 to get the result in Gram: g = ct × 0.2. For example, 5 ct = 1 g.

What is the formula for converting ct to g?

The conversion formula is g = ct × 0.2. 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 g?