Convert milligrams to carats

1 mg=0.005ct

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

You have

Equals

0.005

Conversion formula

Forward

carats = milligrams × 0.005

Reverse

milligrams = carats × 200

Example: 10 mg × 0.005 = 0.05 ct.

About both units

From

Milligram

The milligram equals one thousandth of a gram. It is the dosing unit for most oral medications. A standard paracetamol tablet contains 500 mg. The daily recommended intake of iron for adult men is 8 mg, for women 18 mg. Micrograms (µg) are used for even smaller quantities like vitamin D.

Real-world: A paracetamol tablet is 500 mg. Daily iron intake: 8 mg (men) / 18 mg (women). Aspirin for heart protection: 75–100 mg daily.

Read full milligram 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 →

Milligram to Carat conversion table

Common milligrams to carats values for quick reference.

Milligram (mg)	Carat (ct)
1 mg	0.005 ct
5 mg	0.025 ct
10 mg	0.05 ct
25 mg	0.125 ct
50 mg	0.25 ct
100 mg	0.5 ct
250 mg	1.25 ct
500 mg	2.5 ct
1,000 mg	5 ct
5,000 mg	25 ct

Tips & common mistakes

Quick tips

1 mg = 1/1000 g = 1,000,000 µg. Always check which prefix the label uses.
Read medication labels carefully — confusing mg and µg can be a 1000× dosing error.
Nutrition labels list minerals in mg and vitamins (A, D, K) in µg.

Avoid these

Reading 500 mg as 500 g on a medicine bottle — a potentially fatal 1000× error.
Confusing mg (milligram) with mg/kg (dose per kilogram of body weight).
Mixing up mg and µg — µg is 1000× smaller.

Frequently asked questions

How many carats in a milligram?

One milligram equals 0.005 carats.

How do I convert milligrams to carats?

Multiply the milligram value by 0.005 to get the equivalent in carats.

What is 100 milligrams in carats?

100 milligrams equals 0.5 carats.

Is a milligram bigger than a carat?

No. 1 milligram equals 0.005 carats, so one milligram is smaller.

How to convert milligrams to carats without a calculator?

Multiply by 0 for a quick estimate; use a calculator for precise results.

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