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estadal

1

In Spain, two units. After 1801:

a unit of length = 4 varas = 12 pie, about 3.34 meters.
a unit of area, = 16 square varas = 1/576 fanegada, about 11.18 square meters (about 13.37 square yards).

In the province of Segovia, the square estadal was described in 1886 as being 3¾ varas on a side.¹ In the province of Toledo, an estadal was the area of a square 3 2/3 Castillian varas on a side.

1. Dirección General del Instituto Geográfico y Estadístico.
Equivalencias entre las Pesas y Medidas Usadas Antiguamente en las Diversas Provincias de España y las Legales del Sistema Métrico-Decimal.
Publicadas de Real Orden.
Madrid: Imprenta de la Dirección General del Instituto Geográfica y Estadístico, 1886.

Page 46, under “obrada de tierra”. Page 51, under “fanega supeficial”.

sources

El estadal de que usa el Consejo Real de Castilla, y que en virtud de sus providencias debia usarse en todo el Reyno, se compone de 4. varas ó 12. pies de longitud, que hacen 16 varas, 144. pies, 256. quartas, 2304. palmos, 36874. dedos, 589724. granos, ó 21.233.664. cabellos quadrados superficiales.

The estadal used by the Royal Council of Castile, which by virtue of its provisions was to be used throughout the Kingdom, consists of 4 varas or 12 pies in length, which make [in square measure] 16 square varas, 144 square pies, 256 square quartas, 2304 square palmos, 36,874 square dedos, 589,724 square granos, or 21,233,664 square cabellos.

Don Vicente Martinez Gomez.
Manual de Comercio en que se halla La Description de las Monedas, Pesas y Medidas que se usan en los Reynos de España…
Madrid: en la Imprenta de Don Benito Cano, 1795.
Page 11.

2

In Nicaragua, 11.28 square meters (about 13.49 square yards).

3

In Colombia, article 17 of a law of 12 October 1821 made the estadal = 5 varas, about 4.2 meters (the Castillian vara was then in use in Colombia). Article 3 of a law of 26 May 1853, again defined the estadal as 5 varas and said that as a unit of area it contained 25 square varas.