Carat to Ounce Converter
Enter the value that you want to convert carat to ounce (oz) or ounce to carat.
1 carat = 0.0070548 ounce
Formula: ounce = carat value × 0.0070548
carat to ounce
10 carat = 0.07055 ounce
Popular Weight Converters:
How Carat Relates to Ounce
The Carat Explained
Carat (car, ct) is a unit of weight measurement. 1 carat is equal to 0.0070548 ounce.
The Ounce Explained
Ounce (oz) is a unit of weight measurement. 1 ounce is equal to 141.7476156 carat.
Understanding Weight Conversions
Weight unit conversions are among the most frequently performed in daily life. International commerce ships in metric tonnes and kilograms, while US domestic logistics uses pounds and ounces. Recipes from different countries use different systems — a European cake recipe in grams versus an American one in cups and ounces. Pharmacists convert between milligrams and grains for medication dosing. Athletes track body weight across metric and imperial systems depending on their country and sport federation requirements.
carat to ounce metric conversion table
| 0.01 car, ct | = | 0.00007 oz |
| 0.1 car, ct | = | 0.00071 oz |
| 1 car, ct | = | 0.00705 oz |
| 2 car, ct | = | 0.01411 oz |
| 3 car, ct | = | 0.02116 oz |
| 4 car, ct | = | 0.02822 oz |
| 5 car, ct | = | 0.03527 oz |
| 6 car, ct | = | 0.04233 oz |
| 7 car, ct | = | 0.04938 oz |
| 8 car, ct | = | 0.05644 oz |
| 9 car, ct | = | 0.06349 oz |
| 10 car, ct | = | 0.07055 oz |
| 11 car, ct | = | 0.07760 oz |
| 12 car, ct | = | 0.08466 oz |
| 13 car, ct | = | 0.09171 oz |
| 14 car, ct | = | 0.09877 oz |
| 15 car, ct | = | 0.10582 oz |
| 16 car, ct | = | 0.11288 oz |
| 17 car, ct | = | 0.11993 oz |
| 18 car, ct | = | 0.12699 oz |
| 19 car, ct | = | 0.13404 oz |
| 20 car, ct | = | 0.14110 oz |
| 30 car, ct | = | 0.21164 oz |
| 40 car, ct | = | 0.28219 oz |
| 50 car, ct | = | 0.35274 oz |
| 60 car, ct | = | 0.42329 oz |
| 70 car, ct | = | 0.49384 oz |
| 80 car, ct | = | 0.56438 oz |
| 90 car, ct | = | 0.63493 oz |
| 100 car, ct | = | 0.70548 oz |
| 200 car, ct | = | 1.41096 oz |
| 300 car, ct | = | 2.11644 oz |
| 400 car, ct | = | 2.82192 oz |
| 500 car, ct | = | 3.52740 oz |
| 600 car, ct | = | 4.23288 oz |
| 700 car, ct | = | 4.93835 oz |
| 800 car, ct | = | 5.64383 oz |
| 900 car, ct | = | 6.34931 oz |
| 1000 car, ct | = | 7.05479 oz |
How to Convert Carat to Ounce?
We can convert carat to ounce by using an example.
Example:
Convert 20 Carat to Ounce?
We know 1 Carat = 0.0070548 ounce; 1 Ounce = 141.7476156 carat.
20 carat = ___oz
20 × 0.0070548 = 0.14110 oz (we know 1 carat = 0.0070548 ounce)
Answer:
20 carat = 0.14110 ounce
How to Convert Carats to Ounces (Step-by-Step)
One carat equals approximately 0.00706 ounces (avoirdupois). This conversion puts gem weights into context with everyday ounce measurements — a 1-carat diamond is less than 1/100th of an ounce.
- Identify the weight in carats (ct) you want to convert.
- Multiply by 0.007055 to get the value in ounces.
- Alternatively: convert carats to grams (×0.2), then grams to oz (÷28.3495).
Common Carat to Ounce Conversions
Putting gem weights into everyday ounce context.
| Carat | Ounce |
|---|---|
| 1 ct | 0.00706 oz |
| 5 ct | 0.03527 oz |
| 10 ct | 0.07055 oz |
| 50 ct | 0.35274 oz |
| 100 ct | 0.70548 oz |
| 141.75 ct | 1 oz |
Solved Examples: Carats to Ounces
Question 1: The Koh-i-Noor diamond weighs 105.6 carats. Express in ounces.
Solution:
Weight in oz = 105.6 × 0.007055
= 0.7450 oz
Answer: The Koh-i-Noor weighs only 0.745 ounces (less than 3/4 of an ounce).
Question 2: A collection of 500 carats of rubies — how many ounces total?
Solution:
Weight in oz = 500 × 0.007055
= 3.527 oz
Answer: 500 carats of rubies = 3.53 ounces.
Question 3: Convert a 2-carat engagement ring diamond to ounces.
Solution:
Weight in oz = 2 × 0.007055
= 0.01411 oz
Answer: A 2-carat diamond weighs only 0.014 ounces.
Practice Questions: Carats to Ounces
Try solving these on your own to test your understanding:
- Convert 25 carats to ounces. (Answer: 0.176 oz)
- A gem weighs 0.5 ct. How many ounces? (Answer: 0.00353 oz)
- Express 1,000 carats in ounces. (Answer: 7.055 oz)
- Convert 3 carats to ounces. (Answer: 0.02116 oz)
- How many carats in 2 ounces? (Answer: 283.5 ct)
Why the Ounce is Impractical for Gemstones
A typical engagement diamond (0.5-1.5 ct) weighs between 0.0035 and 0.0106 oz. These tiny decimal fractions would require 3-4 decimal places for any meaningful precision. The carat system provides convenient integer or simple decimal numbers for the same stones. This is why the gem industry adopted its own weight unit rather than using the general-purpose ounce.
Troy Ounce vs Avoirdupois Ounce for Precious Materials
Note: Precious metals use troy ounces (31.1035 g), not avoirdupois ounces (28.3495 g). However, gemstones use carats (0.2 g) regardless. A "1 oz gold setting with a 1 ct diamond" means 31.1 g of gold plus 0.2 g of diamond. The gold is measured in troy ounces and the gem in carats — two completely different systems used together in jewelry.
Key Takeaways
- 1 carat = 0.007055 ounces (avoirdupois).
- 141.75 carats = 1 ounce.
- Even museum-quality gems rarely exceed 1 ounce in weight.
- The ounce is too coarse for gemstone precision — hence carats exist.
- Troy ounces (for gold) differ from avoirdupois ounces (general use).
- Convert via grams: ct × 0.2 = grams, then grams ÷ 28.3495 = oz.
Carat to Ounce Conversion Formula
ounce = carat × 0.0070548
1 carat = 0.0070548 ounce
1 ounce = 141.7476156 carat
Reverse: carat = ounce × 141.7476156
Frequently Asked Questions
How many ounce are in 1 carat?
There are 0.0070548 ounce in 1 carat. To convert carat to ounce, multiply the value by 0.0070548.
How do I convert carat to ounce?
Multiply your carat value by 0.0070548 to get the equivalent in ounce. For example, 5 carat = 5 × 0.0070548 = 0.03527 ounce.
How do I convert ounce to carat?
Multiply your ounce value by 141.7476156 to get the equivalent in carat. Alternatively, divide by 0.0070548.
What is 10 carat in ounce?
10 carat is equal to 0.07055 ounce.
What is 100 carat in ounce?
100 carat is equal to 0.70548 ounce.