Convert Troy Ounce to Carat (metric)
Convert troy ounces to carats (metric) instantly. 1 troy ounce = 155.517384 carat (metric) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Carat (metric) to Troy Ounce converter for the reverse conversion.
Units explained
Troy Ounce
The troy ounce (ozt) equals about 31.103 grams, one-twelfth of a troy pound.
From the Troy system of weights associated with Troyes, France.
The global standard for pricing gold, silver, platinum, and palladium.
Established in the medieval Troy system and retained for precious metals.
Carat (metric)
The metric carat (ct) equals exactly 200 milligrams (0.0002 kg).
From Arabic 'qirat' and Greek 'keration', the carob seed once used as a counterweight.
The worldwide standard for gemstone and diamond mass.
The metric carat was fixed at 200 mg internationally in 1907.
Troy Ounce to Carat (metric) conversion formula
The relationship between troy ounces and carats (metric):
To convert troy ounces to carats (metric), multiply the value in troy ounces by 155.517384. To reverse, multiply carats (metric) by 0.0064301493.
How to use this converter
Type a value into the calculator. The result in carats (metric) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Carat (metric) to Troy Ounce converter for the reverse direction.
Step-by-step: convert troy ounces to carats (metric)
- Write down the value in troy ounces (oz t).
- Multiply that value by the factor 155.517384.
- The product is the equivalent value in carats (metric) (ct).
- To reverse, multiply the carat (metric) value by 0.0064301493.
Worked examples
Example 1 — Convert 1 oz t to ct:
1 × 155.517384 = 155.517384 ct
Example 2 — Convert 100 oz t to ct:
100 × 155.517384 = 15551.7384 ct
Real-world example — Adjacent metric sub-units
One troy ounce equals 1,000 carats (metric). Engineers move between these scales constantly: PCB feature sizes in the larger unit, wire-bond diameters in the smaller.
1 oz t × 155.517384 = 155.517384 ct
Real-world example — Adjacent small-scale precision
One troy ounce equals 1,000 carats (metric) — the standard sub-millimeter precision conversion that materials engineers use whenever they switch between bulk material thickness specs (larger unit) and surface-finish characteristics (smaller unit).
1 oz t × 155.517384 = 155.517384 ct
Troy Ounce to Carat (metric) conversion table
Standard reference values for converting troy ounces to carats (metric):
| Troy Ounce [oz t] | Carat (metric) [ct] |
|---|---|
| 0.01 | 1.55517384 |
| 0.1 | 15.5517384 |
| 1 | 155.517384 |
| 2 | 311.034768 |
| 3 | 466.552152 |
| 4 | 622.069536 |
| 5 | 777.58692 |
| 10 | 1555.17384 |
| 20 | 3110.34768 |
| 30 | 4665.52152 |
| 40 | 6220.69536 |
| 50 | 7775.8692 |
| 100 | 15551.7384 |
| 500 | 77758.692 |
| 1000 | 155517.384 |
Frequently asked questions
How many carats (metric) is 1 troy ounce?
How do I convert troy ounces to carats (metric)?
How do I convert carats (metric) back to troy ounces?
How many carats (metric) is 100 troy ounces?
Popular weight unit conversions
Convert Troy Ounce to other weight units
Show all Troy Ounce conversions
Metric / SI (18 units)
Avoirdupois (15 units)
Troy & Apothecary (9 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 oz t = 155.517384 ct) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.