Carat To Gram Calculator

Work out carat to gram instantly with clear inputs, formula shown and shareable results.

About Carat To Gram Calculator

Converting Carats to Grams is a single multiplication: one ct equals 0.2 g, so the amount is multiplied by that factor. Switching the direction divides by the same factor instead. This factor is an exact definition, not a rounded approximation, so the conversion is precise at any scale. The metric carat is defined as exactly 200 mg. This is gemstone weight, not gold purity — karat with a K is a different measure.

Formulas

Carats → Grams

g = ct × 0.2

Grams → Carats

ct = g ÷ 0.2

Worked example

With the default values below, Carat To Gram Calculator returns Converted Value of 0.2000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Amount to convert: 1
Directionone of Carats → Grams, Grams → Carats: Carats → Grams

Results

Converted Value: 0.2000
Result Unit: g
Multiplier Applied: 0.20000000
Conversion Used: 1 ct = 0.2 g

Step by step

1Values used
2Carats → Grams
3Grams → Carats
4Converted Value= 0.2000
5Result Unit= g
6Multiplier Applied= 0.20000000
7Conversion Used= 1 ct = 0.2 g

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 8 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How many g are in one ct?

One ct is 0.2 g. That figure is exact by definition.

How do I convert Grams back to Carats?

Divide by 0.2 instead of multiplying — or just switch the direction selector, which does it for you.