Convert Carats to Ounces
1 carat (ct) equals 0.00705479239 ounces (oz).
1 ct = 0.00705479239 oz
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk carat to ounce converter to paste a column from Excel.
How to Convert Carat to Ounce
- 1 ct = 0.00705479239 oz
- 1 oz = 141.7476156 ct
- Example: convert 15 ct to oz: 15 ct = 15 × 0.00705479239 oz = 0.1058218858 oz
Reference conditions. oz: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
oz = ct × 0.007054792389916
or oz = ct ÷ 141.747615625
Derivation from SI units:
- 1 ct = 200 mg (metric carat, exact)
- 1 oz = 1/16 lb = 28.349523125 g (exact)
- 1 ct = 0.0002 kg ÷ 0.028349523125 kg per oz = 0.007054792389916 oz
Both units are defined exactly, so the factor is exact. Carat definition: carat; Ounce definition: ounce.
Worked examples
- A reading of 0.75 ct converts to 0.005291094292 oz.
0.75 ct × 0.00705479239 = 0.005291094292 oz - A value of 3 ct is 0.02116437717 oz.
3 ct × 0.00705479239 = 0.02116437717 oz
Carat to Ounce conversion table
| Carats (ct) | Ounces (oz) |
|---|---|
| 0.1 ct | 0.000705479239 oz |
| 0.25 ct | 0.001763698097 oz |
| 0.5 ct | 0.003527396195 oz |
| 0.75 ct | 0.005291094292 oz |
| 1 ct | 0.00705479239 oz |
| 1.5 ct | 0.01058218858 oz |
| 2 ct | 0.01410958478 oz |
| 3 ct | 0.02116437717 oz |
| 5 ct | 0.03527396195 oz |
| 10 ct | 0.0705479239 oz |
| 100 ct | 0.705479239 oz |
Where it's used
Carats are used for diamonds and gemstones, while ounces appear in food and parcel weights in the US. 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 ounces are in 1 carat?
1 ct = 0.00705479239 oz.
How do I convert carats to ounces?
Multiply the value in ct by 0.00705479239, or divide it by 141.7476156. For example, 15 ct × 0.00705479239 = 0.1058218858 oz.
Is the ct to oz 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 (avoirdupois) (oz)".
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 Ounces. Retrieved October 17, 2026, from https://scientificconverters.com/mass/carats-to-ounces/
IEEE
Scientific Converters, "Convert Carats to Ounces," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/carats-to-ounces/