A troy ounce is exactly 31.1034768 grams.
Troy ounces to Carats Converter — oz t to ct
Convert Troy ounce (oz t) to Carat (ct) using the exact conversion factor (1 troy ounce = 155.517384 carat). See the formula, worked examples, and conversion table.
Troy ounces to Carats 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 metric carat is exactly 200 milligrams.
Result = input x 0.0311034768 / 0.0002.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Troy ounces to Carats
Weight conversions between Troy ounce and Carat 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 troy ounce is exactly 31.1034768 grams, and a metric carat is exactly 200 milligrams.
Formula
carats = troy ounces × 155.517384
This factor comes from each unit's defined relationship to the category's base unit: 1 troy ounce equals 0.0311034768 base units, and 1 carat equals 0.0002 base units, so dividing one by the other gives the direct troy ounce-to-carat factor of 155.517384.
Simple example
1 oz t × 155.517384 = 155.517384 ct
1 troy ounce = 155.517384 carats.
Real-world example
50 oz t × 155.517384 = 7,775.8692 ct
50 troy ounces = 7,775.8692 carats.
Conversion table
| Troy ounce (oz t) | Carat (ct) |
|---|---|
| 1 oz t | 155.517384 ct |
| 5 oz t | 777.58692 ct |
| 10 oz t | 1,555.17384 ct |
| 25 oz t | 3,887.9346 ct |
| 50 oz t | 7,775.8692 ct |
| 100 oz t | 15,551.7384 ct |
Reverse conversion: Carat to Troy ounce
155.517384 ct × 0.006430149314 = 1 oz t
155.517384 carats = 1 troy ounce.
troy ounces = carats × 0.00643014931373
For a page dedicated to this direction, see Carat to Troy ounce.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
Understanding the Carat (ct)
A metric carat is exactly 200 milligrams.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many carats are in 1 troy ounce?
1 troy ounce equals 155.517384 carats, using the exact defined conversion factor rather than an estimate.
How do I convert troy ounce to carat?
Multiply the troy ounce value by 155.517384. The converter above does this instantly to whatever precision you set.
How do I convert carat back to troy ounce?
Use the reverse factor: 1 carat equals 0.0064301493 troy ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a troy ounce?
Troy ounce (oz t) is a unit of mass/weight.
What is a carat?
Carat (ct) is a unit of mass/weight.
Is the troy ounce to carat conversion exact?
Yes. Both troy ounce and carat are defined by fixed standards rather than physical artifacts, so the factor of 155.517384 used above is exact to as many digits as you choose to display.