Carats to Troy Ounces (ct to oz t) Converter

How to convert carats to troy ounces

Formulaoz t = ct × 0.006430149314

Multiply the value in carats by 0.006430149314. To go the other way, multiply by 155.517384 (or divide by 0.006430149314).

A carat is smaller than a troy ounce: it takes 155.517384 carats to make one troy ounce.

Worked examples

1 carat1 ct × 0.006430149314 = 0.006430149314 oz t
5 carats5 ct × 0.006430149314 = 0.03215074657 oz t
10 carats10 ct × 0.006430149314 = 0.06430149314 oz t
20 carats20 ct × 0.006430149314 = 0.1286029863 oz t
100 carats100 ct × 0.006430149314 = 0.6430149314 oz t

Carats to troy ounces conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Carats to troy ounces: 0.1–10 ct
Carats (ct)	Troy ounces (oz t)
0.1 ct	0.00064301493 oz t
0.25 ct	0.0016075373 oz t
0.5 ct	0.0032150747 oz t
1 ct	0.0064301493 oz t
2 ct	0.012860299 oz t
3 ct	0.019290448 oz t
4 ct	0.025720597 oz t
5 ct	0.032150747 oz t
6 ct	0.038580896 oz t
7 ct	0.045011045 oz t
8 ct	0.051441195 oz t
9 ct	0.057871344 oz t
10 ct	0.064301493 oz t

Carats to troy ounces: 12–1,000 ct
Carats (ct)	Troy ounces (oz t)
12 ct	0.077161792 oz t
15 ct	0.09645224 oz t
20 ct	0.12860299 oz t
25 ct	0.16075373 oz t
30 ct	0.19290448 oz t
40 ct	0.25720597 oz t
50 ct	0.32150747 oz t
75 ct	0.4822612 oz t
100 ct	0.64301493 oz t
250 ct	1.6075373 oz t
500 ct	3.2150747 oz t
1,000 ct	6.4301493 oz t

About the units

Carat (ct)

The metric carat is exactly 200 mg and is used to weigh gemstones. (Karat, a gold-purity scale, is a different thing.) One carat equals 0.0002 kilograms (kg).

Troy ounce (oz t)

480 grains or 31.1034768 g, about 10% heavier than an ordinary ounce. Gold, silver and platinum prices are quoted per troy ounce. One troy ounce equals 0.0311034768 kilograms (kg).

Frequently asked questions

How many troy ounces are in one carat?

There are 0.006430149314 troy ounces in one carat, and this value is exact by definition.

How do I convert carats to troy ounces?

Multiply the number of carats by 0.006430149314. For example, 10 ct × 0.006430149314 = 0.06430149314 oz t.

How many carats are in one troy ounce?

One troy ounce equals 155.517384 carats. That is the reverse factor, 1 ÷ 0.006430149314.

What is 10 carats in troy ounces?

10 ct = 0.06430149314 oz t.

Is this ct to oz t converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.

Carats to Troy Ounces Converter