Convert Arpent (French) to Acre
Convert arpents to acres instantly. 1 arpent (french) = 1.0430318152 acre — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Acre to Arpent (French) converter for the reverse conversion.
Units explained
Arpent (French)
A French arpent is a historical unit of land area used in pre-metric France, approximately 4221 m² (close to one acre).
Originated as a medieval French land unit; varied considerably by province. The 'arpent de Paris' was officially fixed at 100 perches squared, the perche being 18 pieds.
French arpents appear in pre-revolutionary French land records and in genealogical research. The unit was largely abolished after the French Revolution in favor of metric units.
Medieval French origin; abolished after the French Revolution in favor of metric.
Acre
An acre is an imperial unit of area equal to exactly 4046.8564224 m². It is the most widely used non-metric unit for land area, particularly in the US, UK, and India.
Originally defined in medieval England as the area one yoke of oxen could plow in a day, approximately 40 perches by 4 perches. Standardized via the 1959 International Yard and Pound Agreement.
Acres are the standard land measurement unit in the US (real estate, agriculture), the UK (rural property), and widely used in India (alongside hectares and traditional regional units). 1 acre = 4840 sq yd = 43,560 sq ft = 0.4047 hectare.
Medieval English farming origin; modern exact value standardized in 1959.
Arpent (French) to Acre conversion formula
The relationship between arpents and acres:
To convert arpents to acres, multiply the value in arpents by 1.0430318152. To reverse, multiply acres by 0.9587435258.
How to use this converter
Type a value into the calculator. The result in acres updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Acre to Arpent (French) converter for the reverse direction.
Step-by-step: convert arpents to acres
- Write down the value in arpents (arpent).
- Multiply that value by the factor 1.0430318152.
- The product is the equivalent value in acres (ac).
- To reverse, multiply the acre value by 0.9587435258.
Worked examples
Example 1 — Convert 1 arpent to ac:
1 × 1.0430318152 = 1.0430318152 ac
Example 2 — Convert 100 arpent to ac:
100 × 1.0430318152 = 104.3031815173 ac
Real-world example — Coastal cruise distances
A 10-arpent (french) coastal sailing route converts to a different value in acres — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 arpent × 1.0430318152 = 10.4303181517 ac
Real-world example — Road-sign distances across systems
A 100-arpent (french) road sign converts cleanly into acres — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 arpent × 1.0430318152 = 104.3031815173 ac
Real-world example — Endurance race distances
A 50-arpent (french) cycling or running race converts to a recognizable distance in acres. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 arpent × 1.0430318152 = 52.1515907586 ac
Arpent (French) to Acre conversion table
Standard reference values for converting arpents to acres:
| Arpent (French) [arpent] | Acre [ac] |
|---|---|
| 0.01 | 0.0104303182 |
| 0.1 | 0.1043031815 |
| 1 | 1.0430318152 |
| 2 | 2.0860636303 |
| 3 | 3.1290954455 |
| 4 | 4.1721272607 |
| 5 | 5.2151590759 |
| 10 | 10.4303181517 |
| 20 | 20.8606363035 |
| 30 | 31.2909544552 |
| 40 | 41.7212726069 |
| 50 | 52.1515907586 |
| 100 | 104.3031815173 |
| 500 | 521.5159075865 |
| 1000 | 1043.0318151729 |
Frequently asked questions
How many acres is 1 arpent (french)?
How do I convert arpents to acres?
How do I convert acres back to arpents?
How many acres is 100 arpents?
Popular area unit conversions
Convert Arpent (French) to other area units
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Metric / SI (5 units)
Imperial / US Customary (3 units)
Other Regional (9 units)
Sources & references
Conversion factor (1 arpent = 1.0430318152 ac) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.