18 Carat to Troy Ounce
Quick answer
18 Carat (ct) equals
0.115743 oz t
To convert 18 Carats to Troy Ounces, multiply by 0.0064301493. Therefore, 18 Carat (ct) equals 0.115743 Troy Ounce (oz t).
Formula: oz t = ct × 0.0064301493. Calculation: 18 × 0.0064301493 = 0.115743 oz t.
Convert Carat (ct) to Troy Ounce (oz t) online with our free unit converter. In mass, 1 ct = 0.00643 oz t. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Carat to Troy Ounce
- Step 1 — start with the formula. oz t = ct × 0.0064301493
- Step 2 — substitute your figure. 18 ct × 0.0064301493
- Step 3 — read the result. 18 ct = 0.115743 oz t
- Step 4 — check it in reverse. ct = oz t × 155.517384 returns 18 ct, which matches the figure you started with.
Mass Converter
26 units available
18 ct = 0.115743 oz t
Formula:
oz t = ct × 0.0064301493With your value: 18 ct = 0.11574269 oz t
How big is that?
Everyday references on a logarithmic scale, all expressed in carat so you can sanity-check the result.
Other Carat to Troy Ounce conversions
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
The metric carat is exactly 200 mg, agreed internationally in 1907.
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Troy Ounce (oz t)
Mass
1 troy ounce = 480 grains = 0.031 103 476 8 kg exactly. Used for precious metals only.
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
Carat and Troy Ounce Relationship
This calculation facilitates standardized conversion between recognized units of mass. Since 1 Carat represents a fraction of a Troy Ounce (1 Troy Ounce ≈ 155.5174 Carats), the Troy Ounce is the larger measurement interval. Understanding the relationship between Carat and Troy Ounce is essential for accurate calculations in physics, engineering, commerce, and daily applications.
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 of Carat: 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 of Troy Ounce: gold trading, silver markets, precious metals.
Frequently Asked Questions
- What is 18 Carat in Troy Ounce?
- 18 Carat equals 0.115743 Troy Ounce.
- How many Troy Ounces are in 1 Carat?
- There are exactly 0.0064301493 Troy Ounces 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 Carats to Troy Ounces, you would multiply 10 by 0.0064301493.
- What is a Carat?
- The carat equals 200 milligrams and is the standard unit for measuring gemstone weight.
- What is a Troy Ounce?
- The troy ounce equals approximately 31.1 grams and is used for weighing precious metals like gold, silver, and platinum.
- What are the common uses of Carat?
- The Carat is commonly used in gemstones, diamonds, jewelry.
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). 18 Carat to Troy Ounce. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/18-carat-to-troy_ounce