Roman Pounds to Ounces (libra to oz)
1 Roman pound (libra) equals 11.60160609 ounces (rounded).
How to convert Roman pounds to ounces
To convert Roman pounds to ounces, multiply the number of Roman pounds by 11.60160609. The factor is rounded to 10 significant digits. To go the other way, multiply ounces by 0.08619496237 (rounded).
ounces = Roman pounds × 11.60160609
Example: 10 Roman pounds = 116.0160609 ounces.
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
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
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)
Related conversions
- Ounces to Roman pounds (reverse)
- Roman pounds to kilograms
- Roman pounds to grams
- Roman pounds to metric tons
- Roman pounds to pounds
- Kilograms to ounces
- Grams to ounces
- Metric tons to ounces
- Pounds to ounces
- Milligrams to ounces
- Micrograms to ounces
- Carats to ounces
- Stone to ounces
- Short tons to ounces
- Long tons to ounces
- Troy ounces to ounces
- Daltons to ounces
See all weight & mass units.