Ounces to Arrobas (Spanish) (oz to @)
1 ounce equals 0.00246467763 arrobas (Spanish) (rounded).
How to convert ounces to arrobas (Spanish)
To convert ounces to arrobas (Spanish), multiply the number of ounces by 0.00246467763. The factor is rounded to 10 significant digits. To go the other way, multiply arrobas (Spanish) by 405.7325744 (rounded).
arrobas (Spanish) = ounces × 0.00246467763
Example: 10 ounces = 0.0246467763 arrobas (Spanish).
Approximate value. Standards for the arroba (Spanish) 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)
Arroba (Spanish) (@)
25 libras, about 11.5 kg. A Castilian weight (and a liquid volume unit); the '@' sign descends from its abbreviation.
Arabic ar-rubʿ, meaning a quarter, is the probable source of arroba, since the unit was the fourth part of a quintal. Moorish rule in Iberia left the word in Spanish and Portuguese, and Wikipedia repeats a tradition, without a source, that it approximated what a donkey could carry. In Castile the quintal was 100 libras, which makes the arroba 25 libras.
With the Castilian libra of 0.460093 kg set in the standard of 1801, the Spanish arroba comes to about 11.5 kg, the figure used here. Similar values were found in Catalonia, Aragon and Andalusia, while the Portuguese arroba was heavier at about 14.7 kg. The same name also applied to a liquid measure for wine and oil, so the word could mean either a weight or a volume depending on the trade.
Colonial administrations took the unit across the Atlantic, where it hardened into different national values: 15 kg in Brazilian cattle and cotton markets, and 12.5 kg in Colombia, Ecuador and Peru. In Spanish and Portuguese the at sign in email addresses is still called arroba, because the symbol was long used as shorthand for the unit.
1 arroba (Spanish) = 11.502325 kilograms (approximately).
Sources: Wikipedia: Arroba; Wikipedia: Spanish customary units
Related conversions
- Arrobas (Spanish) 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 arrobas (Spanish)
- Grams to arrobas (Spanish)
- Metric tons to arrobas (Spanish)
- Pounds to arrobas (Spanish)
See all weight & mass units.