Ounces to Roman Pounds (oz to libra)
1 ounce equals 0.08619496237 Roman pounds (rounded).
How to convert ounces to Roman pounds
To convert ounces to Roman pounds, multiply the number of ounces by 0.08619496237. The factor is rounded to 10 significant digits. To go the other way, multiply Roman pounds by 11.60160609 (rounded).
Roman pounds = ounces × 0.08619496237
Example: 10 ounces = 0.8619496237 Roman pounds.
Approximate value. Standards for the Roman pound (libra) varied by place and period, so this converter uses the most commonly cited value. Treat results as estimates, not exact figures.
About these units
Ounce (oz)
One sixteenth of a pound, exactly 28.349523125 g. Used for food, mail and consumer goods in the US and UK.
A twelfth part is what ounce originally meant. It comes from the Roman uncia, one twelfth of the Roman pound, a word that also gave English the inch. The abbreviation oz does not come from English at all but from the Italian onza or oncia. Over the centuries many regions and trades used different ounces: the English Tower ounce of 29.16 g was abolished by Henry VIII in 1527, and the Dutch ons was redefined as exactly 100 g in 1820.
The avoirdupois ounce used for everyday goods is one sixteenth of a pound, exactly 28.349523125 g or 437.5 grains, the standard in the US and under the UK imperial system. It is not the same as the troy ounce for precious metals, and neither is the fluid ounce, which measures volume. Ounces still describe portions such as steaks and burgers, and they show up in unexpected places: fabric is graded by weight per area, so a 16 oz denim is a heavy cloth, and the copper on a circuit board is specified in ounces, where 1 oz is roughly 34.7 micrometres thick.
1 ounce = 0.02834952313 kilograms (approximately).
Sources: Wikipedia: Ounce; NIST Guide to the SI, Appendix B.8 (mass conversions)
Roman Pound (libra) (libra)
About 328.9 g, divided into 12 unciae. The abbreviation 'lb' for pound comes from libra.
Libra is the Latin word for a balance, and it named both the scales and the standard weight placed on them. It is also known simply as the Roman pound, and the English abbreviation lb is generally traced back to it.
Roman weights counted in twelfths. A libra held 12 unciae, and further fractions such as the scrupulum and the tiny siliqua, about 0.19 g, allowed fine work. The coin called the as shared this scheme: it began as a pound of bronze, then was cut to two ounces after the First Punic War, one ounce during the Second, and half an ounce by the Lex Papiria of 131 BC.
Modern estimates for the libra range from about 322 to 329 g. The figure used here is 328.9 g, about 11.6 oz or 0.725 of an English pound, which is lighter than the avoirdupois pound of 453.6 g. Surviving weights differ among themselves, which is why the exact value stays uncertain.
1 Roman pound (libra) = 0.3289 kilograms (approximately).
Sources: Wikipedia: Roman pound; Wikipedia: Roman units of measurement
Related conversions
- Roman pounds to ounces (reverse)
- Ounces to kilograms
- Ounces to grams
- Ounces to metric tons
- Ounces to pounds
- Ounces to milligrams
- Ounces to micrograms
- Ounces to carats
- Ounces to stone
- Ounces to short tons
- Ounces to long tons
- Ounces to troy ounces
- Ounces to daltons
- Kilograms to Roman pounds
- Grams to Roman pounds
- Metric tons to Roman pounds
- Pounds to Roman pounds
See all weight & mass units.