Convert 18 ct to g

How to convert carats to grams

1. Formula: grams = carats × 0.2
2. Put in the value: 18 carats.
3. Result: 3.6 grams.

Carats to grams table

Converting the other way: grams to carats

carats = grams × 5. So 3.6 grams is back to 18 carats; one gram is 5 carats. See the grams to carats table.

Quick estimate in your head

For a rough answer, multiply by about 0.2: 18 × 0.2 ≈ 3.6 g, against the exact 3.6 g (0.0% out). Good enough to check that a calculated result is sensible.

Common mistakes

The usual slip is using the factor the wrong way round. A carat is smaller than a gram, so the number of grams must come out smaller than the number of carats. If your answer goes the other way, divide instead of multiplying.

About the units

Carat (ct) and gram (g) are both units of mass. One carat equals 0.2 grams, and one gram equals 5 carats. Results on this page are rounded for display; the conversion itself uses the exact definitions.

Mass conversions come up in cooking and baking, shipping and luggage limits, body weight, medicine doses and buying food by weight.

18 carats in other units

The most readable unit for this amount is grams (3.6).

• 3,600 mg
• 3.6 g
• 0.0036 kg
• 0.0000036 t
• 0.12698626 oz
• 0.00793664 lb
• 0.0005669 st
• 0.00000397 ton

How this answer was calculated

The result is worked out from the numbers in this page's address when the page is opened, using exact arithmetic wherever possible and rounding only for display. Nothing is copied from a printed table. If you think an answer is wrong, please tell us through the contact page and we will check it.

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