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Convert Obolus to Ounce (ob to oz) 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.
Obolus (obol) — a historical unit of mass equal to 10 grains
It is commonly treated as half a scruple, or 10 grains, in historical Roman and apothecaries’ weight contexts; because the obolus was also a coin and ancient weight term, its exact value can vary by period and region. Used mainly in historical medicine, pharmacy, numismatics, and references to ancient or apothecaries’ measures.
- Symbol: obol, obolus
- System: Historical Roman and apothecaries’ unit for mass
- Exact relations: 1 obolus = 1/2 scruple = 10 gr = 647.9891 mg
- Metric equivalents: 1 obolus = 0.6479891 g ≈ 0.000647989 kg
- Typical examples: historical prescriptions may mention oboli; 2 oboli equals scruple; 1 obolus is a little less than 2/3 of a gram.
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.