Carat to Troy Ounce Converter

Mass Converter

26 units available

Decimals:

From

To

0.00643

1 ct = 0.00643 oz t

Formula:

oz t = ct × 0.0064301493

With your value: 1 ct = 0.00643015 oz t

How big is that?

Everyday references on a logarithmic scale, all expressed in carat so you can sanity-check the result.

Your value1.00 ct

Paperclip (5.0× your value)5.00 ct

AA battery (1.2e+2× your value)120 ct

Can of soda (2.0e+3× your value)1.95e+3 ct

Bag of sugar (5.0e+3× your value)5.00e+3 ct

House cat (2.3e+4× your value)2.25e+4 ct

Other Carat to Troy Ounce conversions

2 ct to oz t 3 ct to oz t 4 ct to oz t 5 ct to oz t 6 ct to oz t 7 ct to oz t 8 ct to oz t

Carat to Troy Ounce Conversion Table

Carat (ct)	Troy Ounce (oz t)
0.5	0.003215
1	0.00643
2	0.01286
5	0.032151
10	0.064301
15	0.096452
20	0.128603
25	0.160754
50	0.321507
100	0.643015
250	1.607537
500	3.215075
1000	6.430149

Troy Ounce to Carat Conversion Table

Troy Ounce (oz t)	Carat (ct)
0.5	77.758692
1	155.517384
2	311.034768
5	777.58692
10	1,555.17384
15	2,332.76076
20	3,110.34768
25	3,887.9346
50	7,775.8692
100	15,551.7384
250	38,879.346
500	77,758.692
1000	155,517.384

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Carat (ct)

Mass

Conventional value

The metric carat is exactly 200 mg, agreed internationally in 1907.

Source: NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Troy Ounce (oz t)

Mass

Exact conversion

1 troy ounce = 480 grains = 0.031 103 476 8 kg exactly. Used for precious metals only.

Source: NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Carat to Troy Ounce

To convert from Carat (ct) to Troy Ounce (oz t), multiply the value by 0.0064301493.

Formula: oz t = ct × 0.0064301493

Reverse: ct = oz t × 155.517384

Step-by-Step Example

Start with your value in Carat. For example: 5 ct
Multiply by the conversion factor: 5 x 0.0064301493
The result is: 0.032151 oz t

About Carat

The carat equals 200 milligrams and is the standard unit for measuring gemstone weight.

Fun Fact: The word "carat" comes from the carob seed, which was used as a balance weight in ancient gem trading.

Common uses: gemstones, diamonds, jewelry.

About Troy Ounce

The troy ounce equals approximately 31.1 grams and is used for weighing precious metals like gold, silver, and platinum.

Common uses: gold trading, silver markets, precious metals.

Frequently Asked Questions

How many Troy Ounce are in 1 Carat?

There are exactly 0.0064301493 Troy Ounce in 1 Carat. This means the conversion factor from Carat to Troy Ounce is 0.0064301493.

What is the formula to convert Carat to Troy Ounce?

The formula to convert Carat to Troy Ounce is: oz t = ct × 0.0064301493. For example, to convert 10 Carat to Troy Ounce, you would multiply 10 by 0.0064301493.

What is a Carat?