Convert Arpent (French) to Hectare
Convert arpents to hectares instantly. 1 arpent (french) = 0.4221 hectare — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Hectare 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.
Hectare
A hectare is a metric unit of area equal to 10,000 square meters, or one square hectometer. It is the most widely used metric unit for land measurement worldwide.
Defined as 100 ares, equal to one square hectometer. The name was introduced in 1795 in France as part of the metric system.
Hectares are the standard unit for agricultural land measurement worldwide except in the US (which uses acres). 1 hectare equals 2.47105 acres. In India, hectares are used in modern agricultural census and land records alongside traditional regional units.
Adopted in France in 1795; standardized internationally through the SI system.
Arpent (French) to Hectare conversion formula
The relationship between arpents and hectares:
To convert arpents to hectares, multiply the value in arpents by 0.4221. To reverse, multiply hectares by 2.3691068467.
How to use this converter
Type a value into the calculator. The result in hectares updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Hectare to Arpent (French) converter for the reverse direction.
Step-by-step: convert arpents to hectares
- Write down the value in arpents (arpent).
- Multiply that value by the factor 0.4221.
- The product is the equivalent value in hectares (ha).
- To reverse, multiply the hectare value by 2.3691068467.
Worked examples
Example 1 — Convert 1 arpent to ha:
1 × 0.4221 = 0.4221 ha
Example 2 — Convert 100 arpent to ha:
100 × 0.4221 = 42.21 ha
Real-world example — Maritime exclusion zone
A 200-arpent (french) exclusion zone (a common maritime boundary) converts to a different value in hectares that's useful when describing the same zone in everyday land-distance units.
200 arpent × 0.4221 = 84.42 ha
Real-world example — Coastal cruise distances
A 10-arpent (french) coastal sailing route converts to a different value in hectares — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 arpent × 0.4221 = 4.221 ha
Real-world example — Road-sign distances across systems
A 100-arpent (french) road sign converts cleanly into hectares — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 arpent × 0.4221 = 42.21 ha
Arpent (French) to Hectare conversion table
Standard reference values for converting arpents to hectares:
| Arpent (French) [arpent] | Hectare [ha] |
|---|---|
| 0.01 | 0.004221 |
| 0.1 | 0.04221 |
| 1 | 0.4221 |
| 2 | 0.8442 |
| 3 | 1.2663 |
| 4 | 1.6884 |
| 5 | 2.1105 |
| 10 | 4.221 |
| 20 | 8.442 |
| 30 | 12.663 |
| 40 | 16.884 |
| 50 | 21.105 |
| 100 | 42.21 |
| 500 | 211.05 |
| 1000 | 422.1 |
Frequently asked questions
How many hectares is 1 arpent (french)?
How do I convert arpents to hectares?
How do I convert hectares back to arpents?
How many hectares is 100 arpents?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (3 units)
Other Regional (9 units)
Sources & references
Conversion factor (1 arpent = 0.4221 ha) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.