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Conversion Formula:
Convert Ounce to Pennyweight (oz to dwt) 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.
Ounce (oz) — an imperial and US customary unit of mass
It is defined as exactly one sixteenth of an avoirdupois pound; since 1 lb = 0.45359237 kg exactly, 1 oz = 28.349523125 g exactly. Used in the United States and some other countries for measuring food, packages, precious metals, and everyday small masses.
- Symbol: oz
- System: Imperial and US customary unit for mass
- Exact relations: 1 oz = 1/16 lb = 28.349523125 g = 28,349.523125 mg
- Metric equivalents: 1 oz ≈ 28.3495 g ≈ 0.0283495 kg
- Typical examples: a slice of bread ~1 oz; a letter ~1 oz; a small bag of chips ~1 oz.
Pennyweight (dwt) — a troy unit of mass for precious metals
It is defined as exactly 24 grains, or one twentieth of a troy ounce. Used mainly for measuring precious metals, jewelry, gemstones, dental alloys, and historical coin or bullion weights.
- Symbol: dwt
- System: Troy unit for mass
- Exact relations: 1 dwt = 24 gr = 1/20 oz t = 1.55517384 g
- Metric equivalents: 1 dwt = 1.55517384 g ≈ 0.00155517 kg
- Typical examples: small gold jewelry may weigh a few dwt; precious-metal scrap is often priced per dwt; 20 dwt equals 1 troy ounce.