Enter carats or ounces into the calculator to convert to the other value, supporting carats, points, grams, and both avoirdupois and troy ounces.

Carat to Ounces Conversion Calculator

Enter exactly 1 value to calculate the other

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Carat to Ounces Formula

The following formulas convert carats to ounces and back; US avoirdupois ounces are shown first, followed by a general approach using grams.

\mathrm{oz} = 0.0070547924\,\mathrm{ct}
\mathrm{ct} = 141.7476156\,\mathrm{oz}
  • Carat (ct) = 0.2 g (exact).
  • Point (pt) = 0.01 ct = 0.002 g.
  • Avoirdupois ounce (oz) = 28.349523125 g.
  • Troy ounce (ozt) = 31.1034768 g.

How do you convert carats to ounces? Multiply carats by 0.00705479 to get avoirdupois ounces; for troy ounces, multiply by 0.00643015 (since 1 ozt = 31.1034768 g).

How do you convert ounces to carats? Multiply avoirdupois ounces by 141.7476 to get carats; for troy ounces, multiply by 155.5174.

Carats to Ounces Conversion Table

Carats to Ounces (US Avoirdupois)
Carats (ct) Ounces (oz, avdp)
0.250.001764
0.50.003527
0.750.005291
10.007055
1.250.008818
1.50.010582
1.750.012346
20.014110
2.50.017637
30.021164
40.028219
50.035274
7.50.052911
100.070548
12.50.088185
150.105822
200.141096
250.176370
500.352740
1000.705479
* Avoirdupois: 1 oz = 28.349523125 g and 1 ct = 0.2 g; therefore 1 oz = 141.7476156 ct.

Example Problem

Convert 2.5 carats to ounces (avoirdupois).

Use the AV formula: oz = ct × 0.00705479.

oz = 2.5 × 0.00705479 = 0.017637 oz