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Carat Converters

Convert carats to grams, milligrams, ounces, pounds, troy ounces and grains, and back, for gemstone and jewelry weights.

What this tool does

Convert carats to grams, milligrams, ounces, pounds, troy ounces and grains, and back, for gemstone and jewelry weights. Type an amount in carats (metric), choose the units, and the tool converts it to grams. It offers 10 mass units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 10 options, including Carat (metric), Gram, Milligram, Kilogram, Ounce (avoirdupois), Pound (avoirdupois). Starts as Carat (metric).
  • To: Choose one of the same 10 units as "From". Starts as Gram.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from carats (metric) to grams:

  • 1 ct = 0.2 g
  • 5 ct = 1 g
  • 10 ct = 2 g
  • 50 ct = 10 g
  • 100 ct = 20 g

Multiply the number of carats (metric) by 0.2 to get grams. Both units are exact definitions, so 0.2 is the exact factor: 1 ct = 0.2 g.

Sources: Carat (metric): NIST SP 811 (2008), Appendix B.8. Gram: SI Brochure, 9th edition (2019).

Limitations

  • Converts mass units only. It does not convert between mass and volume or energy, which needs a density or other second value.
  • Uses the metric carat of 200 milligrams. Gemstone grading, price and size in millimeters are not part of this converter.

FAQs

Q: How many milligrams are in a carat?
A: A metric carat is exactly 200 milligrams, which is 0.2 grams. Choose carat as the From unit and milligram as the To unit to see any value.
Q: Is a carat the same as a karat?
A: No. A carat measures the weight of gemstones. A karat (as in 18-karat gold) measures the purity of gold. This page converts carats of weight only.
Q: Which ounce is used?
A: Both are listed. Ounce (avoirdupois) is the everyday ounce of about 28.35 grams. The troy ounce, used for precious metals, is about 31.10 grams.

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