Troy Ounce to Carat Converter

Mass Converter

26 units available

Decimals:

From

To

155.517384

1 oz t = 155.517384 ct

Formula:

ct = oz t × 155.517384

With your value: 1 oz t = 155.517384 ct

How big is that?

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

Paperclip (1/31 your value)0.0322 oz t

AA battery (1/1.3 your value)0.772 oz t

Your value1.00 oz t

Can of soda (13× your value)12.5 oz t

Bag of sugar (32× your value)32.2 oz t

House cat (1.4e+2× your value)145 oz t

Other Troy Ounce to Carat conversions

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

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

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

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.

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

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

How to Convert Troy Ounce to Carat

To convert from Troy Ounce (oz t) to Carat (ct), multiply the value by 155.517384.

Formula: ct = oz t × 155.517384

Reverse: oz t = ct × 0.0064301493

Step-by-Step Example

Start with your value in Troy Ounce. For example: 5 oz t
Multiply by the conversion factor: 5 x 155.517384
The result is: 777.58692 ct

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.

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.

Frequently Asked Questions

How many Carat are in 1 Troy Ounce?

There are exactly 155.517384 Carat in 1 Troy Ounce. This means the conversion factor from Troy Ounce to Carat is 155.517384.

What is the formula to convert Troy Ounce to Carat?

The formula to convert Troy Ounce to Carat is: ct = oz t × 155.517384. For example, to convert 10 Troy Ounce to Carat, you would multiply 10 by 155.517384.

What is a Troy Ounce?