Convert Troy Ounces to Carats
1 troy ounce (oz t) equals 155.517384 carats (ct).
1 oz t = 155.517384 ct
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk troy ounce to carat converter to paste a column from Excel.
How to Convert Troy Ounce to Carat
- 1 oz t = 155.517384 ct
- 1 ct = 0.006430149314 oz t
- Example: convert 15 oz t to ct: 15 oz t = 15 × 155.517384 ct = 2332.76076 ct
Formula
ct = oz t × 155.517384
Derivation from SI units:
- 1 oz t = 480 gr = 31.1034768 g (exact)
- 1 ct = 200 mg (metric carat, exact)
- 1 oz t = 0.0311034768 kg ÷ 0.0002 kg per ct = 155.517384 ct
Both units are defined exactly, so the factor is exact. Troy Ounce definition: troy ounce; Carat definition: carat.
Worked examples
- A reading of 2 oz t converts to 311.034768 ct.
2 oz t × 155.517384 = 311.034768 ct - A value of 32.15 oz t is 4999.883896 ct.
32.15 oz t × 155.517384 = 4999.883896 ct
Troy Ounce to Carat conversion table
| Troy Ounces (oz t) | Carats (ct) |
|---|---|
| 0.1 oz t | 15.5517384 ct |
| 0.25 oz t | 38.879346 ct |
| 0.5 oz t | 77.758692 ct |
| 1 oz t | 155.517384 ct |
| 2 oz t | 311.034768 ct |
| 5 oz t | 777.58692 ct |
| 10 oz t | 1555.17384 ct |
| 20 oz t | 3110.34768 ct |
| 32.15 oz t | 4999.883896 ct |
| 50 oz t | 7775.8692 ct |
| 100 oz t | 15551.7384 ct |
| 400 oz t | 62206.9536 ct |
Where it's used
Troy Ounces are used for gold, silver and platinum prices, while carats appear in diamonds and gemstones. Both measure mass (commonly called weight), so the conversion is a fixed factor.
Troy Ounce to other weight and mass units
| Conversion | 1 oz t equals |
|---|---|
| troy ounce to kilogram | 0.0311034768 kg |
| troy ounce to gram | 31.1034768 g |
| troy ounce to milligram | 31103.4768 mg |
| troy ounce to microgram | 31103476.8 µg |
| troy ounce to metric ton | 0.0000311034768 t |
| troy ounce to pound | 0.06857142857 lb |
| troy ounce to ounce | 1.097142857 oz |
| troy ounce to stone | 0.004897959184 st |
| troy ounce to short ton | 0.00003428571429 ton (US) |
| troy ounce to long ton | 0.0000306122449 ton (UK) |
| troy ounce to grain | 480 gr |
| troy ounce to carat | 155.517384 ct |
Frequently asked questions
How many carats are in 1 troy ounce?
1 oz t = 155.517384 ct.
How do I convert troy ounces to carats?
Multiply the value in oz t by 155.517384. For example, 15 oz t × 155.517384 = 2332.76076 ct.
Is the oz t to ct conversion exact?
Yes. Both units are defined exactly, and 1 oz t is exactly 155.517384 ct.
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, "ounce (troy or apothecary)".
- 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".
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 Troy Ounces to Carats. Retrieved October 17, 2026, from https://scientificconverters.com/mass/troy-ounces-to-carats/
IEEE
Scientific Converters, "Convert Troy Ounces to Carats," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/troy-ounces-to-carats/