Arrátel

The arrátel (pt; plural arráteis)^[1] was the base unit of weight in the Portuguese customary measurement system.^[2][3] Until the adoption of the metric system in the 19th century, the arrátel was used in Portugal, Brazil and other parts of the Portuguese Empire.^[4]

The real value of the arrátel fluctuated during the Middle Ages. Before King Peter I, the main arrátel seems to have been equivalent to ​12 ¹⁄₂ ounces. With Peter I, the official arrátel increased to 14 ounces. Finally, the Portuguese arrátel was fixed at 16 ounces by decree of King Manuel I in 1499. This arrátel, which was kept as the national standard until the introduction of the metric system, was similar to the Spanish libra.

• 13th century: ​12 ¹⁄₂ onças (ounces) = ​²⁵⁄₃₂ libra = 0.3596 kilograms^[2]
• 15th century: 14 onças = 0.4025 kg^[2]
• 1499: 16 onças = 1 libra = 1.011 avoirdupois pounds = 0.4590 kg^[2][4]

• Portuguese customary units
• Pound (mass)

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