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Weight

Convert carats to ounces

1 ct=0.007055oz

Use the converter below to change any carats value into ounces instantly — with formula, conversion table, and real-world examples.

0.0070548

Conversion formula

Forward
ounces = carats × 0.007055
Reverse
carats = ounces × 141.748

Example: 10 ct × 0.007055 = 0.07055 oz.

About both units

From

Carat

ct

The metric carat equals 200 milligrams exactly. It is the standard unit for gemstone weight — diamonds, rubies, sapphires and emeralds are sold by the carat. Do not confuse with the purity carat (karat) used for gold (24K = pure gold).

Real-world: A 1-carat diamond weighs 200 mg and is typically 6.5 mm across. The Hope Diamond is 45.52 carats (9.1 g).
Read full carat reference →
To

Ounce

oz

The ounce equals 28.35 grams and is 1/16 of a pound. It is common in American and British cooking for small ingredient weights. The fluid ounce (29.57 ml in the US, 28.41 ml in the UK) is a volume unit and is completely different from the mass ounce.

Real-world: A US tin of tuna is 5 oz (142 g). A Starbucks grande coffee is 16 fl oz (473 ml). Gold is traded in troy ounces (31.10 g).
Read full ounce reference →

Carat to Ounce conversion table

Common carats to ounces values for quick reference.

Carat (ct)Ounce (oz)
1 ct0.007055 oz
5 ct0.03527 oz
10 ct0.07055 oz
25 ct0.1764 oz
50 ct0.3527 oz
100 ct0.7055 oz
250 ct1.7637 oz
500 ct3.5274 oz
1,000 ct7.05479 oz
5,000 ct35.274 oz

Tips & common mistakes

Quick tips

  • 1 carat = 200 mg = 0.2 g exactly since 1907.
  • Carat (gem weight) and karat (gold purity, 24 K = pure) are different words with different meanings.
  • A carat is divided into 100 points; a 0.25 ct diamond is called a "25-pointer".

Avoid these

  • Confusing carat (mass) with karat (gold purity).
  • Assuming a 2-carat diamond is twice the physical size of a 1-carat — volume scales with cube root of mass.
  • Using "karat" on gemstone certificates — international standard is "carat" spelled with a C.

Frequently asked questions

How many ounces in a carat?
One carat equals 0.007055 ounces.
How do I convert carats to ounces?
Multiply the carat value by 0.007055 to get the equivalent in ounces.
What is 100 carats in ounces?
100 carats equals 0.7055 ounces.
Is a carat bigger than a ounce?
No. 1 carat equals 0.007055 ounces, so one carat is smaller.
How to convert carats to ounces without a calculator?
Multiply by 0.01 for a quick estimate; use a calculator for precise results.

Related weight conversions

📊 See full comparison matrix →

More from Carat

ct → kg
1 = 0.0002 kg
ct → g
1 = 0.2 g
ct → mg
1 = 200 mg
ct → µg
1 = 200,000 µg
ct → lb
1 = 0.0004409 lb
ct → t
1 = 2.0000e-7 t
ct → ton (US)
1 = 2.2046e-7 ton (US)
ct → ton (UK)
1 = 1.9684e-7 ton (UK)

More to Ounce

kg → oz
1 = 35.274 oz
g → oz
1 = 0.03527 oz
mg → oz
1 = 3.5274e-5 oz
µg → oz
1 = 3.5274e-8 oz
lb → oz
1 = 16 oz
t → oz
1 = 35,273.96 oz
ton (US) → oz
1 = 32,000 oz
ton (UK) → oz
1 = 35,840 oz

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