carats to mg | Exact Decimal + Stone/Pounds

1 Carat = 200 Milligram

One carat equals exactly 200 milligrams — 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 milligrams, which is used for medication dosages, supplement labels, and analytical chemistry measurements. Enter any value above — the result updates instantly, and a 1–1000 reference table follows below.

About Carat and Milligram

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.

Milligram (mg)

A milligram is one-thousandth of a gram, about the mass of a grain of salt.

Where it's used: Medication dosages, supplement labels, and analytical chemistry measurements.

Weight & Mass Converter

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Precision

Formula

mg = ct × 200

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

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Carat to Milligram: Quick Reference Table

Carat	Milligram (Decimal)	Fraction	Real-world equivalent
0.001 ct	0.2 mg	13/64 mg	fractional unit measurement
0.01 ct	2 mg	-	standard single unit scale
0.1 ct	20 mg	-	multiple unit increments
0.5 ct	100 mg	-	multiple unit increments
1 ct	200 mg	-	multiple unit increments
2 ct	400 mg	-	multiple unit increments
5 ct	1000 mg	-	multiple unit increments
10 ct	2000 mg	-	multiple unit increments
25 ct	5000 mg	-	multiple unit increments
50 ct	10000 mg	-	multiple unit increments
100 ct	20000 mg	-	multiple unit increments
250 ct	50000 mg	-	multiple unit increments
500 ct	100000 mg	-	multiple unit increments
1000 ct	200000 mg	-	multiple unit increments

ct to mg Formula and Examples

Direct Formula mg = ct × 200

Inverse Formula ct = mg × 0.005

Mental Math Shortcut

Multiply the value by roughly 200 to calculate the equivalent amount in your head.

Common Carat to Milligram Calculations

5 ct = 1000 mg
10 ct = 2000 mg
50 ct = 10000 mg
100 ct = 20000 mg
500 ct = 100000 mg

Precision & Practical Use

For example, 10 ct = 2000 mg — roughly multiple unit increments.

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.

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How to Convert Carat to Milligram

How many milligrams are in one carat?

One Carat (ct) equals 200 Milligram (mg). To convert carats to milligrams, multiply the carat value by 200.

How do I convert Carat to Milligram?

Multiply your carat value by 200 to get the result in Milligram: mg = ct × 200. For example, 5 ct = 1000 mg.

What is the formula for converting ct to mg?

The conversion formula is mg = ct × 200. 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 mg?