Arpents to Square Feet (arpent to ft²)
1 arpent (North American) equals 36,800.62568 square feet (rounded).
How to convert arpents to square feet
To convert arpents to square feet, multiply the number of arpents by 36,800.62568. The factor is rounded to 10 significant digits. To go the other way, multiply square feet by 0.00002717345103 (rounded).
square feet = arpents × 36,800.62568
Example: 10 arpents = 368,006.2568 square feet.
Approximate value. Standards for the arpent (North American) varied by place and period, so this converter uses the most commonly cited value. Treat results as estimates, not exact figures.
About these units
Arpent (North American) (arpent)
About 3,419 m² (0.845 acre), a square of 180 French feet. Still used in Louisiana and Quebec land records. The older Paris arpent was larger, about 5,107 m².
Arpent probably descends from the Late Latin arepennis, half a jugerum, which may itself trace to a Gaulish word for the end of a field. French surveyors used it for land and forests, and the size changed from province to province. Wikipedia describes the Paris arpent as 220 French feet on a side, about 71.5 m, which gives roughly 5,107 square meters.
The smaller arpent of 180 French feet, about 58.5 m on a side, gives 32,400 square French feet, near 3,419 square meters or 0.845 acre. Wikipedia files this version under North America, where Louisiana grants usually fixed river frontage in arpents with plots 40 or more deep. Some states round it differently, to 0.84628 acre in Louisiana and 0.8507 acre in Arkansas and Missouri.
The figure used here is 3,418.9 square meters. Mauritius and Seychelles use yet another arpent, near 4,221 square meters, and Quebec land records still use the term.
1 arpent (North American) = 3,418.89 square meters (approximately).
Sources: Wikipedia: Arpent
Square Foot (ft²)
Exactly 0.09290304 m². The standard unit for floor areas and real estate in the US, UK and India.
Feet came first, and they were not all the same length. As a body-based unit, the foot ranged historically between about 250 and 335 millimeters, with ancient Greek and Roman feet near 300 mm. In medieval England a statute foot was set at 10/11 of an older Belgic foot, and Charlemagne's attempt around 790 to standardize units largely failed. The square foot is simply that length squared, so its size changed along with the foot.
The 1959 international agreement fixed the foot at exactly 0.3048 meter, so one square foot is exactly 0.09290304 m², or 144 square inches. The United Kingdom adopted the new foot in 1964. Today the square foot is the usual way of listing property in the United States, Canada, the United Kingdom, India, Pakistan, Singapore and Hong Kong, although the measuring convention varies: agents may measure corner to corner, subtract unheated space, or add heated space that extends beyond the end-to-end measurement. The world's smallest park has been reported at 2.6 sq ft.
1 square foot = 0.09290304 square meters (exactly).
Sources: Wikipedia: Square foot; Wikipedia: Foot (unit); NIST Guide to the SI, Appendix B.8: conversion factors
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See all area units.