Convert Carats to Troy Ounces
1 carat (ct) equals 0.006430149314 troy ounces (oz t).
1 ct = 0.006430149314 oz t
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk carat to troy ounce converter to paste a column from Excel.
How to Convert Carat to Troy Ounce
- 1 ct = 0.006430149314 oz t
- 1 oz t = 155.517384 ct
- Example: convert 15 ct to oz t: 15 ct = 15 × 0.006430149314 oz t = 0.09645223971 oz t
Formula
oz t = ct × 0.006430149313726
or oz t = ct ÷ 155.517384
Derivation from SI units:
- 1 ct = 200 mg (metric carat, exact)
- 1 oz t = 480 gr = 31.1034768 g (exact)
- 1 ct = 0.0002 kg ÷ 0.0311034768 kg per oz t = 0.006430149313726 oz t
Both units are defined exactly, so the factor is exact. Carat definition: carat; Troy Ounce definition: troy ounce.
Worked examples
- A reading of 0.75 ct converts to 0.004822611985 oz t.
0.75 ct × 0.006430149314 = 0.004822611985 oz t - A value of 3 ct is 0.01929044794 oz t.
3 ct × 0.006430149314 = 0.01929044794 oz t
Carat to Troy Ounce conversion table
| Carats (ct) | Troy Ounces (oz t) |
|---|---|
| 0.1 ct | 0.0006430149314 oz t |
| 0.25 ct | 0.001607537328 oz t |
| 0.5 ct | 0.003215074657 oz t |
| 0.75 ct | 0.004822611985 oz t |
| 1 ct | 0.006430149314 oz t |
| 1.5 ct | 0.009645223971 oz t |
| 2 ct | 0.01286029863 oz t |
| 3 ct | 0.01929044794 oz t |
| 5 ct | 0.03215074657 oz t |
| 10 ct | 0.06430149314 oz t |
| 100 ct | 0.6430149314 oz t |
Where it's used
Carats are used for diamonds and gemstones, while troy ounces appear in gold, silver and platinum prices. Both measure mass (commonly called weight), so the conversion is a fixed factor.
Carat to other weight and mass units
| Conversion | 1 ct equals |
|---|---|
| carat to kilogram | 0.0002 kg |
| carat to gram | 0.2 g |
| carat to milligram | 200 mg |
| carat to microgram | 200000 µg |
| carat to metric ton | 2 × 10⁻⁷ t |
| carat to pound | 0.0004409245244 lb |
| carat to ounce | 0.00705479239 oz |
| carat to stone | 0.00003149460888 st |
| carat to short ton | 2.204622622 × 10⁻⁷ ton (US) |
| carat to long ton | 1.968413055 × 10⁻⁷ ton (UK) |
| carat to grain | 3.086471671 gr |
| carat to troy ounce | 0.006430149314 oz t |
Frequently asked questions
How many troy ounces are in 1 carat?
1 ct = 0.006430149314 oz t.
How do I convert carats to troy ounces?
Multiply the value in ct by 0.006430149314, or divide it by 155.517384. For example, 15 ct × 0.006430149314 = 0.09645223971 oz t.
Is the ct to oz t conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "carat, metric".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "ounce (troy or apothecary)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Carats to Troy Ounces. Retrieved October 17, 2026, from https://scientificconverters.com/mass/carats-to-troy-ounces/
IEEE
Scientific Converters, "Convert Carats to Troy Ounces," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/carats-to-troy-ounces/