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Grams to Carats Converter

Convert grams to carats and carats to grams instantly. Bidirectional weight converter with formula for gemstones.

g

Carats

17.5

ct

3.5 g = 17.5 ct

ct = g × 5

Grams to Carats: 1 g equals 5 ct. To convert grams to carats, multiply by 5 (ct = g × 5). For example, 10 g = 50 ct.

How to Convert Grams to Carats

To convert from grams to carats, multiply the value by 5. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Grams to Carats: ct = g × 5
  • Carats to Grams: g = ct ÷ 5

Grams to Carats Conversion Chart

Grams (g)Carats (ct)
0.10.5
0.251.25
0.52.5
15
210
315
525
1050
20100
25125
50250
100500
2501250
10005000

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 Grams (g) Carats (ct)
A paperclip15
A US dollar bill15
A nickel coin525

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FAQ

How many carats are in a gram?

There are exactly 5 carats in one gram. One carat equals 0.2 grams or 200 milligrams.

What is a carat?

The carat (ct) is a unit of mass used for measuring gemstones and pearls. It equals exactly 200 milligrams (0.2 grams), standardized internationally since 1907.

Is a carat the same as a karat?

No. A carat (ct) measures gemstone weight, while a karat (kt) measures gold purity. 24-karat gold is pure gold; a 1-carat diamond weighs 0.2 grams.

How do I convert grams to carats?

Multiply the gram value by 5. For example, 3.5 g = 17.5 carats.

How many carats are in 1 gram?

1 g equals 5 ct.

How do you convert grams to carats?

Multiply the gram value by 5. Formula: ct = g × 5.

How many carats are in 5 grams?

5 g = 25 ct.

How do you convert carats back to grams?

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