Ounces (oz) to Carats (ct) Converter
Enter a value to instantly convert between weight units.
1 Ounce = 141.7476 Carat
Key Formulas
Kilogram → Pound
lb = kg × 2.20462Pound → Kilogram
kg = lb × 0.453592Gram → Ounce
oz = g × 0.035274Ounce → Gram
g = oz × 28.3495Formula
ct = oz × (0.028349523125 / 0.0002)One ounce is about 141.7476 carats, so multiply ounces by 141.7476. The ounce is 1/16 of a pound under NIST Handbook 44, the pound is 0.45359237 kg under NIST footnote 22, and the metric mass carat is 0.2 g under NIST Appendix B.8. A 0.25 oz parcel holds about 35.44 ct. The FTC covers gold karat purity, and a troy ounce falls outside this avoirdupois result.
Source: NIST exact and named mass definitions (definition-derived arithmetic)
Reviewed by the Convert Calc editorial team · Last reviewed: · see our methodology
Frequently Asked Questions
Real-World Examples
A 1 oz parcel of loose stones, in carats.
1 oz = 141.7476156 ct
An 8 oz bag of tumbled gemstones.
8 oz = 1133.980925 ct
A half-ounce lot of small gems.
0.5 oz = 70.87380781 ct
A 16 oz (1 lb) lot of rough stones.
16 oz = 2267.96185 ct