A metric carat is exactly 200 milligrams.
Carats to Troy ounces Converter — ct to oz t
Convert Carat (ct) to Troy ounce (oz t) using the exact conversion factor (1 carat = 0.0064301493 troy ounce). See the formula, worked examples, and conversion table.
Carats to Troy ounces converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
A troy ounce is exactly 31.1034768 grams.
Result = input x 0.0002 / 0.0311034768.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Carats to Troy ounces
Weight conversions between Carat and Troy ounce come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: A metric carat is exactly 200 milligrams, and a troy ounce is exactly 31.1034768 grams.
Formula
troy ounces = carats × 0.00643014931373
This factor comes from each unit's defined relationship to the category's base unit: 1 carat equals 0.0002 base units, and 1 troy ounce equals 0.0311034768 base units, so dividing one by the other gives the direct carat-to-troy ounce factor of 0.00643014931373.
Simple example
1 ct × 0.006430149314 = 0.0064301493 oz t
1 carat = 0.0064301493 troy ounces.
Real-world example
50 ct × 0.006430149314 = 0.3215074657 oz t
50 carats = 0.3215074657 troy ounces.
Conversion table
| Carat (ct) | Troy ounce (oz t) |
|---|---|
| 1 ct | 0.0064301493 oz t |
| 5 ct | 0.0321507466 oz t |
| 10 ct | 0.0643014931 oz t |
| 25 ct | 0.1607537328 oz t |
| 50 ct | 0.3215074657 oz t |
| 100 ct | 0.6430149314 oz t |
Reverse conversion: Troy ounce to Carat
0.0064301493 oz t × 155.517384 = 0.9999999979 ct
0.0064301493 troy ounces = 0.9999999979 carats.
carats = troy ounces × 155.517384
For a page dedicated to this direction, see Troy ounce to Carat.
Understanding the Carat (ct)
A metric carat is exactly 200 milligrams.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many troy ounces are in 1 carat?
1 carat equals 0.0064301493 troy ounces, using the exact defined conversion factor rather than an estimate.
How do I convert carat to troy ounce?
Multiply the carat value by 0.006430149314. The converter above does this instantly to whatever precision you set.
How do I convert troy ounce back to carat?
Use the reverse factor: 1 troy ounce equals 155.517384 carats. You can also use the swap control in the converter above to flip the direction instantly.
What is a carat?
Carat (ct) is a unit of mass/weight.
What is a troy ounce?
Troy ounce (oz t) is a unit of mass/weight.
Is the carat to troy ounce conversion exact?
Yes. Both carat and troy ounce are defined by fixed standards rather than physical artifacts, so the factor of 0.006430149314 used above is exact to as many digits as you choose to display.