Ounces to Carats
Convert ounces to carats instantly — one ounce is 141.748 carats.
| Ounces | Carats |
|---|---|
| 1 oz | 141.747616 ct |
| 2 oz | 283.495231 ct |
| 3 oz | 425.242847 ct |
| 5 oz | 708.738078 ct |
| 10 oz | 1417.476156 ct |
| 25 oz | 3543.690391 ct |
| 50 oz | 7087.380781 ct |
| 100 oz | 14174.761563 ct |
How to use
- Enter a value in the Ounces field.
- The Carats figure appears immediately — no button to press.
- Typing in the Carats field converts back to Ounces the same way.
- Use the reference table for the values that come up most often.
Ounces to Carats formula
To convert ounces to carats, multiply by 141.747616.
ct = oz × 141.747616
Why this factor: the ounce and the carat are both defined against the kilogram, so dividing one definition by the other gives 141.747616 directly. Both definitions are set out in full below.
To go the other way, divide by 141.747616 — or use the Carats to Ounces converter, which is the same calculation reversed.
Worked example
Given 2 oz, multiplying by 141.747616 yields 283.495231 ct.
2 oz × 141.747616 = 283.495231 ct
The converter above does this for any value you type, in either direction.
What is an ounce?
An ounce is one sixteenth of a pound, used for small weights in the US.
Definition: Exactly 28.349523125 grams — one sixteenth of the international avoirdupois pound.
Where it is used: Food packaging, postal weights, and coffee and spice quantities in the US.
Worth knowing: Not the same as a fluid ounce, which measures volume. Also distinct from the troy ounce (31.103 g) used for gold and silver.
What is a carat?
A metric carat is the standard mass unit for gemstones.
Definition: Exactly 200 milligrams — that is, 0.2 gram — standardized internationally in 1907.
Where it is used: Diamond and gemstone weight throughout the jewellery trade.
Worth knowing: Do not confuse the carat (gemstone mass) with the karat (gold purity out of 24). A 1-carat diamond and 24-karat gold measure entirely different things.
Ounces vs Carats
The ounce is an imperial unit while the carat is a specialized unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many carats are in an ounce?
One ounce equals 141.747616 carats.
What is the formula to convert ounces to carats?
Multiply the number of ounces by 141.747616. To reverse it, divide by 141.747616 instead.
How do I convert carats back to ounces?
Divide by 141.747616, which is the same as multiplying by 0.00705479239.
How many carats are in 10 ounces?
10 oz works out to 1417.476156 ct.
Is there anything to watch out for with ounces?
Not the same as a fluid ounce, which measures volume. Also distinct from the troy ounce (31.103 g) used for gold and silver.
How is the ounce defined?
Exactly 28.349523125 grams — one sixteenth of the international avoirdupois pound.