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Carats to Grams Converter

Convert carats to grams and grams to carats instantly. Essential converter for gemstones and precious stones.

ct

Grams

0.5

g

2.5 ct = 0.5 g

g = ct × 0.2

Carats to Grams: 1 ct equals 0.2 g. To convert carats to grams, multiply by 0.2 (g = ct × 0.2). For example, 10 ct = 2 g.

How to Convert Carats to Grams

To convert from carats to grams, multiply the value by 0.2. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Carats to Grams: g = ct × 0.2
  • Grams to Carats: ct = g ÷ 0.2

Carats to Grams Conversion Chart

Carats (ct)Grams (g)
0.10.02
0.250.05
0.50.1
10.2
20.4
30.6
51
102
204
255
5010
10020
25050
1000200

Understanding the Units

What is a Gram?

A gram is one thousandth of a kilogram (1 g = 0.001 kg).

From the Greek gramma, a small weight in Late Antiquity.

Common contexts: cooking, pharmacy, lab work.

Real-World Reference Points

Item Carats (ct) Grams (g)
A paperclip51
A US dollar bill51
A nickel coin255

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FAQ

How many grams are in a carat?

One carat equals exactly 0.2 grams (200 milligrams).

What is the difference between a carat and a karat?

A carat (ct) measures gemstone weight (0.2 grams). A karat (K or kt) measures gold purity on a scale of 24 parts. They are completely different units despite the similar spelling.

Why do jewelers use carats instead of grams?

The carat originated from the carob seed, which was historically used as a balance weight due to its remarkably consistent mass. It was standardized to exactly 0.2 grams in 1907.

How much does a typical engagement ring diamond weigh in grams?

A typical engagement ring diamond ranges from 0.5 to 1.5 carats, which is 0.1 to 0.3 grams. A 1-carat diamond weighs exactly 0.2 grams.

How many grams are in 1 carat?

1 ct equals 0.2 g.

How do you convert carats to grams?

Multiply the carat value by 0.2. Formula: g = ct × 0.2.

How many grams are in 5 carats?

5 ct = 1 g.

How do you convert grams back to carats?

Use the inverse formula: ct = g ÷ 0.2. For example, 1 g = 5 ct.