ct to g Converter

Type a value in carats and read the equivalent in grams immediately, with the exact factor and common values.

How ct to g works

Convert carats to grams instantly. 1 ct = 0.2 g, with a live result and a quick reference table. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

What one ct is in g

The conversion is a single multiplication by 0.2, so the result is only as rounded as the display. Going the other way divides by the same figure: one g is 5 ct.

No intermediate rounding happens. A value entered with four decimals comes back with the same precision, which is what makes the factor trustworthy for anything that accumulates error.

Values people ask for

ctg
1 ct0.2 g
2 ct0.4 g
5 ct1 g
10 ct2 g
25 ct5 g
50 ct10 g
100 ct20 g

Where this pair comes up

Gemstones are weighed in carats, and 1 carat is exactly 0.2 g.

Carat weight is not the same as “karat”, which measures gold purity.

Good to know

  • Works offline once loaded, including on flights and in locked-down networks.
  • No file size limit beyond your device's own memory.
  • Free to use, with no account and no usage counter.
  • Results are produced locally, so they are not logged or shared with anyone.

Questions

What is the conversion factor?

1 ct = 0.2 g, from the international definition.

Can I convert backwards?

Divide by 0.2 to go the other way.

Is the factor exact?

It is the standard definition for this pair, applied without intermediate rounding. Only the displayed result is rounded.

Can I convert g back to ct?

Yes — divide by 0.2 instead of multiplying, or use the reverse page if one exists.

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