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Convert Carat to Troy Ounce (ct to oz t) instantly with accurate, readable results.
Use our Mass Unit Converter to convert between grams, kilograms, pounds, ounces, and other weight units instantly. Designed for cooking, science, fitness, and engineering needs, this unit conversion tool offers accurate results between metric and imperial systems. Whether you’re tracking body weight, measuring ingredients, or handling heavy machinery, our mass unit conversion calculator has you covered.
Carat (ct) — a metric unit of mass for gemstones
It is defined as exactly 200 milligrams, or one fifth of a gram. Used worldwide for measuring diamonds, gemstones, pearls, and other jewels; it should not be confused with karat, which measures gold purity.
- Symbol: ct
- System: Non-SI metric unit for mass; used with SI
- Exact relations: 1 ct = 200 mg = 0.2 g = 0.0002 kg
- Imperial equivalents (derived from 1 lb = 0.45359237 kg exactly): 1 ct ≈ 0.00705479 oz ≈ 0.000440925 lb
- Typical examples: a small diamond ~0.25 ct; an engagement-ring diamond ~1 ct; large gemstones may be several ct.
Troy ounce (ozt) — a troy unit of mass for precious metals
It is defined as exactly 480 grains, or one twelfth of a troy pound; since 1 grain = 64.79891 mg exactly, 1 troy ounce = 31.1034768 g exactly. Used mainly for measuring precious metals such as gold, silver, platinum, and palladium, as well as bullion and coin weights.
- Symbol: ozt, oz t
- System: Troy unit for mass
- Exact relations: 1 ozt = 480 gr = 20 dwt = 31.1034768 g
- Metric equivalents: 1 ozt = 31.1034768 g ≈ 0.0311035 kg
- Typical examples: a standard gold bullion coin ~1 ozt; silver rounds are often 1 ozt; precious-metal prices are commonly quoted per troy ounce.