Convert Arpent (French) to Tan
Convert arpents to tan instantly. 1 arpent (french) = 4.2561730138 tan — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Tan 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.
Tan
A tan is a Japanese unit of area equal to approximately 991.74 m². It equals 300 tsubo, or 1/10 chō.
Traditional Japanese agricultural unit. The tan was the standard rice paddy size in pre-modern Japan.
Tan appears in Japanese rural property records and historical land descriptions. Used alongside chō and tsubo in Japanese agricultural documentation.
Traditional Japanese unit; standardized via the tsubo definition.
Arpent (French) to Tan conversion formula
The relationship between arpents and tan:
To convert arpents to tan, multiply the value in arpents by 4.2561730138. To reverse, multiply tan by 0.2349528548.
How to use this converter
Type a value into the calculator. The result in tan updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Tan to Arpent (French) converter for the reverse direction.
Step-by-step: convert arpents to tan
- Write down the value in arpents (arpent).
- Multiply that value by the factor 4.2561730138.
- The product is the equivalent value in tan (tan).
- To reverse, multiply the tan value by 0.2349528548.
Worked examples
Example 1 — Convert 1 arpent to tan:
1 × 4.2561730138 = 4.2561730138 tan
Example 2 — Convert 100 arpent to tan:
100 × 4.2561730138 = 425.6173013786 tan
Real-world example — Maritime exclusion zone
A 200-arpent (french) exclusion zone (a common maritime boundary) converts to a different value in tan that's useful when describing the same zone in everyday land-distance units.
200 arpent × 4.2561730138 = 851.2346027572 tan
Real-world example — Coastal cruise distances
A 10-arpent (french) coastal sailing route converts to a different value in tan — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 arpent × 4.2561730138 = 42.5617301379 tan
Real-world example — Road-sign distances across systems
A 100-arpent (french) road sign converts cleanly into tan — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 arpent × 4.2561730138 = 425.6173013786 tan
Arpent (French) to Tan conversion table
Standard reference values for converting arpents to tan:
| Arpent (French) [arpent] | Tan [tan] |
|---|---|
| 0.01 | 0.0425617301 |
| 0.1 | 0.4256173014 |
| 1 | 4.2561730138 |
| 2 | 8.5123460276 |
| 3 | 12.7685190414 |
| 4 | 17.0246920551 |
| 5 | 21.2808650689 |
| 10 | 42.5617301379 |
| 20 | 85.1234602757 |
| 30 | 127.6851904136 |
| 40 | 170.2469205514 |
| 50 | 212.8086506893 |
| 100 | 425.6173013786 |
| 500 | 2128.086506893 |
| 1000 | 4256.1730137859 |
Frequently asked questions
How many tan is 1 arpent (french)?
How do I convert arpents to tan?
How do I convert tan back to arpents?
How many tan 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 = 4.2561730138 tan) 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.