Troy Ounce to Carat Conversion Calculator: Free Online Tool
Convert troy ounces to carats with our free online weight converter.
Troy Ounce to Carat Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Troy Ounce).
- The converted value in Carat will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Weight category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Troy Ounce to Carat
Converting Troy Ounce to Carat involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Troy Ounce = 155.517 caratsExample Calculation:
Convert 5 troy ounces: 5 × 155.517 = 777.585 carats
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
What is a Troy Ounce and a Carat?
The troy ounce (oz t) is a unit of mass traditionally used for precious metals (like gold, silver, platinum) and sometimes gemstones. It is defined as exactly 31.1034768 grams.
The carat is a unit of mass used for measuring gemstones and pearls. It is defined as exactly 200 milligrams (0.2 grams).
Note: The Troy Ounce is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Carat belongs to the imperial/US customary system.
History of the Troy Ounce and Carat
The troy weight system likely originated in Troyes, France, a major trading town in the Middle Ages. It became a standard in England for precious metals and coinage. Unlike the more common avoirdupois ounce (approx. 28.35 g), the troy ounce persists in the precious metals market.
The term "carat" comes from the carob seed ("keration" in Greek), which was historically used as a standard for weighing small quantities due to its perceived uniform weight. The metric carat of 200 mg was adopted internationally in 1907.
Common Uses for troy ounces and carats
Explore the typical applications for both Troy Ounce (imperial/US) and Carat (imperial/US) to understand their common contexts.
Common Uses for troy ounces
- Precious Metals: The standard unit for quoting prices and weighing gold, silver, and platinum bullion (bars, coins).
- Gemstones: Sometimes used, although carat is more common for individual stones.
Common Uses for carats
- Jewelry Industry: The primary unit for weighing diamonds and other precious gemstones.
- Pearls: Used for weighing pearls.
- Note: This is distinct from "karat," which measures the purity of gold.
Frequently Asked Questions
Questions About Troy Ounce (oz t)
Is a troy ounce the same as a regular ounce?
No. A troy ounce (approx. 31.10 g) is heavier than an avoirdupois ounce (the common "ounce" used for food, etc., approx. 28.35 g).
How many troy ounces are in a troy pound?
There are 12 troy ounces in one troy pound (which is lighter than an avoirdupois pound).
How many grams are in a troy ounce?
There are exactly 31.1034768 grams in 1 troy ounce.
About Carat (ct)
How many milligrams are in a carat?
There are exactly 200 milligrams (mg) in 1 carat (ct).
How many grams are in a carat?
There are 0.2 grams (g) in 1 carat (ct).
Is carat the same as karat?
No. Carat (ct) measures mass (weight) for gemstones, while Karat (K or kt) measures the purity of gold (e.g., 24K gold is pure gold).
Conversion Table: Troy Ounce to Carat
| Troy Ounce (oz t) | Carat (ct) |
|---|---|
| 1 | 155.517 |
| 5 | 777.587 |
| 10 | 1,555.174 |
| 25 | 3,887.935 |
| 50 | 7,775.869 |
| 100 | 15,551.738 |
| 500 | 77,758.692 |
| 1,000 | 155,517.384 |
All Weight Conversions
Other Units from Weight
- Kilogram (kg)
- Gram (g)
- Milligram (mg)
- Pound (lb)
- Ounce (oz)
- Stone (st)
- Ton (metric) (t)
- Ton (US) (ton)
- Ton (UK) (long ton)
- Microgram (µg)
- Slug (sl)
- Pennyweight (dwt)
- Grain (gr)
- Dram (dr)
- Quintal (q)
- Atomic Mass Unit (u)
- Pavan (India) (pavan)
- Kati (India) (kati)
- Masha (India) (masha)
- Dina (India) (dina)
- Pras (India) (pras)
- Lota (India) (lota)