Arrobas (Brazilian) to Kilograms (@ to kg)

1 arroba (Brazilian) equals 15 kilograms exactly.

1 arroba (Brazilian) = 15 kilograms

How to convert arrobas (Brazilian) to kilograms

To convert arrobas (Brazilian) to kilograms, multiply the number of arrobas (Brazilian) by 15. This factor is exact. To go the other way, multiply kilograms by 0.06666666667 (rounded).

kilograms = arrobas (Brazilian) × 15

Example: 10 arrobas (Brazilian) = 150 kilograms.

About these units

Arroba (Brazilian) (@)

Spanish & PortugueseTraditional unit (still used in some regions)

Exactly 15 kg. Used in Brazil for the weight of cattle and cotton.

Arabic ar-rubʿ, a quarter, is the root of arroba, which was a fourth of a quintal in the Iberian trade world. Portugal carried the unit to Brazil, and in Portugal the arroba was about 14.7 kilograms, while parts of Spain such as Galicia, Aragon and Andalusia used about 11.5.

Brazil's modern metric arroba is 15 kilograms, the figure used here, and the agricultural sector still relies on it, mainly for cattle and cotton. Elsewhere in Latin America the value differs: 12.5 kilograms in Colombia, Ecuador and Peru, while Bolivia's national arroba is a volume of 30.46 liters. Because the symbol @ is also the word arroba in Spanish and Portuguese, the same sign serves as the email at-sign in those languages.

1 arroba (Brazilian) = 15 kilograms (exactly).

Sources: Wikipedia: Arroba

Kilogram (kg)

Metric (SI)Current unit

The SI base unit of mass. Since 2019 it is defined by fixing the value of the Planck constant, replacing the old platinum-iridium cylinder in Paris.

Oddly for a base unit, the kilogram began life as a derived one. In 1793 revolutionary France defined the grave as the mass of one litre of water, and a decree of 1795 then replaced it with the kilogramme, a name built from the Greek khilioi (a thousand) and gramma, a Late Latin word for a small weight. In 1799 a platinum cylinder, the Kilogramme des Archives, became the physical standard, matching a cubic decimetre of water at its densest, around 4 degrees Celsius. In 1889 the metric community adopted a platinum-iridium cylinder made in 1879, the International Prototype of the Kilogram, nicknamed Le Grand K.

The kilogram is still the only SI base unit with a prefix in its name. Because SI forbids stacked prefixes, a millionth of a kilogram is a milligram rather than a microkilogram, so every mass prefix is attached to the gram. Calibrating every national standard against one object in a vault near Paris meant that all of them drifted relative to it, so in November 2018 member states voted to tie the kilogram to a fixed value of the Planck constant. The change took effect on 20 May 2019. Day to day nothing shifted, but the definition no longer depends on a single piece of metal.

The kilogram is the reference unit for weight & mass on this site.

Sources: NIST: Kilogram introduction (SI redefinition); Wikipedia: Kilogram

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