Mass and Weight · Unit Converter

Convert Carat (metric) to Troy Ounce

Convert carats (metric) to troy ounces instantly. 1 carat (metric) = 0.0064301493 troy ounce — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Troy Ounce to Carat (metric) converter for the reverse conversion.

Written by Sunith Babu L, Ph.D., Lead Engineer Reviewed by Dr. Ashok Kumar K, Ph.D.
Mass and Weight category 2 min read Published Last reviewed Updated

Units explained

Troy & Apothecary

Carat (metric)

What is a carat (metric)?

The metric carat (ct) equals exactly 200 milligrams (0.0002 kg).

Origin of the carat (metric)

From Arabic 'qirat' and Greek 'keration', the carob seed once used as a counterweight.

Where it is used

The worldwide standard for gemstone and diamond mass.

When and where it was developed

The metric carat was fixed at 200 mg internationally in 1907.

Troy & Apothecary

Troy Ounce

What is a troy ounce?

The troy ounce (ozt) equals about 31.103 grams, one-twelfth of a troy pound.

Origin of the troy ounce

From the Troy system of weights associated with Troyes, France.

Where it is used

The global standard for pricing gold, silver, platinum, and palladium.

When and where it was developed

Established in the medieval Troy system and retained for precious metals.

Carat (metric) to Troy Ounce conversion formula

The relationship between carats (metric) and troy ounces:

1 ct = 0.0064301493 oz t
1 oz t = 155.517384 ct

To convert carats (metric) to troy ounces, multiply the value in carats (metric) by 0.0064301493. To reverse, multiply troy ounces by 155.517384.

How to use this converter

Type a value into the calculator. The result in troy ounces updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Troy Ounce to Carat (metric) converter for the reverse direction.

Step-by-step: convert carats (metric) to troy ounces

  1. Write down the value in carats (metric) (ct).
  2. Multiply that value by the factor 0.0064301493.
  3. The product is the equivalent value in troy ounces (oz t).
  4. To reverse, multiply the troy ounce value by 155.517384.

Worked examples

Example 1 — Convert 1 ct to oz t:
1 × 0.0064301493 = 0.0064301493 oz t

Example 2 — Convert 100 ct to oz t:
100 × 0.0064301493 = 0.6430149314 oz t

Real-world example — Plastic film and laminate thickness

A 500-carat (metric) sheet is a typical spec for ID-card laminates and film overlays. Converting to troy ounces aligns the value with the unit most CAD systems and material datasheets prefer.

500 ct × 0.0064301493 = 3.2150746569 oz t

Real-world example — Packaging gauge

A 4-carat (metric) plastic bag thickness is a common spec for grocery and freezer bags. Converting from carats (metric) to troy ounces is what packaging buyers do whenever they bridge US and metric supplier quotes.

4 ct × 0.0064301493 = 0.0257205973 oz t

Carat (metric) to Troy Ounce conversion table

Standard reference values for converting carats (metric) to troy ounces:

Carat (metric) [ct]Troy Ounce [oz t]
0.016.430149e-5
0.10.0006430149
10.0064301493
20.0128602986
30.0192904479
40.0257205973
50.0321507466
100.0643014931
200.1286029863
300.1929044794
400.2572059725
500.3215074657
1000.6430149314
5003.2150746569
10006.4301493137

Frequently asked questions

How many troy ounces is 1 carat (metric)?
1 carat (metric) equals 0.0064301493 troy ounce.
How do I convert carats (metric) to troy ounces?
Multiply the value in carats (metric) by 0.0064301493 to get troy ounces.
How do I convert troy ounces back to carats (metric)?
Multiply the value in troy ounces by 155.517384, or use the Troy Ounce to Carat (metric) converter.
How many troy ounces is 100 carats (metric)?
100 carats (metric) equals 0.6430149314 troy ounces, because 100 × 0.0064301493 = 0.6430149314.

Convert Carat (metric) to other weight units

Show all Carat (metric) conversions
Metric / SI (18 units)
Carat (metric) to Attogram (ag) Carat (metric) to Femtogram (fg) Carat (metric) to Picogram (pg) Carat (metric) to Nanogram (ng) Carat (metric) to Microgram (µg) Carat (metric) to Milligram (mg) Carat (metric) to Centigram (cg) Carat (metric) to Decigram (dg) Carat (metric) to Gram (g) Carat (metric) to Dekagram (dag) Carat (metric) to Hectogram (hg) Carat (metric) to Kilogram (kg) Carat (metric) to Quintal (metric) (q) Carat (metric) to Metric Ton (t) Carat (metric) to Gigagram (Gg) Carat (metric) to Teragram (Tg) Carat (metric) to Petagram (Pg) Carat (metric) to Exagram (Eg)
Avoirdupois (15 units)
Carat (metric) to Grain (gr) Carat (metric) to Dram (avoirdupois) (dr) Carat (metric) to Ounce (oz) Carat (metric) to Pound (lb) Carat (metric) to Clove (clove) Carat (metric) to Stone (US) (st) Carat (metric) to Stone (UK) (st) Carat (metric) to Quarter (US) (qr) Carat (metric) to Quarter (UK) (qr) Carat (metric) to Hundredweight (US) (cwt) Carat (metric) to Hundredweight (UK) (cwt) Carat (metric) to Wey (wey) Carat (metric) to Kilopound (kip) (kip) Carat (metric) to Ton (short, US) (sh tn) Carat (metric) to Ton (long, UK) (long tn)
Troy & Apothecary (9 units)
Carat (metric) to Point (1/100 carat) (pt) Carat (metric) to Scruple (apothecary) (s ap) Carat (metric) to Pennyweight (dwt) Carat (metric) to Momme (mom) Carat (metric) to Mace (mace) Carat (metric) to Dram (apothecary/troy) (dr ap) Carat (metric) to Troy Ounce (oz t) Carat (metric) to Tael (tael) Carat (metric) to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Carat (metric) to Ratti (ratti) Carat (metric) to Masha (masha) Carat (metric) to Tola (tola) Carat (metric) to Chittack (Chatank) (chittack) Carat (metric) to Seer (Ser) (seer) Carat (metric) to Maund (Mann) (maund)
Scientific / Atomic (9 units)
Carat (metric) to Electron Mass (rest) (me) Carat (metric) to MeV/c2 (MeV/c²) Carat (metric) to Muon Mass (mµ) Carat (metric) to Atomic Mass Unit (u) Carat (metric) to Proton Mass (mp) Carat (metric) to Neutron Mass (mn) Carat (metric) to Deuteron Mass (md) Carat (metric) to Carbon-12 Atom Mass (C-12) Carat (metric) to Planck Mass (mP)
Astronomical (4 units)
Carat (metric) to Lunar Mass (Moon) (M☾) Carat (metric) to Earth's Mass (M⊕) Carat (metric) to Jupiter Mass (MJ) Carat (metric) to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Carat (metric) to Lepton (Biblical Roman) (lepton) Carat (metric) to Quadrans (Biblical Roman) (quadrans) Carat (metric) to Assarion (Biblical Roman) (assarion) Carat (metric) to Gerah (Biblical Hebrew) (gerah) Carat (metric) to Drachma (Biblical Greek) (drachma) Carat (metric) to Denarius (Biblical Roman) (denarius) Carat (metric) to Bekan (Biblical Hebrew) (bekah) Carat (metric) to Didrachma (Biblical Greek) (didrachma) Carat (metric) to Shekel (Biblical Hebrew) (shekel) Carat (metric) to Tetradrachma (Biblical Greek) (tetra) Carat (metric) to Mina (Biblical Greek) (mina) Carat (metric) to Mina (Biblical Hebrew) (mina) Carat (metric) to Talent (Biblical Greek) (talent) Carat (metric) to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Carat (metric) to Poundal (pdl) Carat (metric) to Ton (assay) (US) (AT) Carat (metric) to Ton (assay) (UK) (AT) Carat (metric) to Kilogram-force square second/meter (hyl) Carat (metric) to Slug (slug)

Sources & references

Conversion factor (1 ct = 0.0064301493 oz t) verified against the following authoritative sources:

Results are provided for general reference. Verify critical measurements against an authoritative standard.