Wa to Arpent Converter
Convert wa to arpents with our free online length converter.
Quick Answer
1 Wa = 0.034205 arpents
Formula: Wa × conversion factor = Arpent
Use the calculator below for instant, accurate conversions.
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Wa to Arpent Calculator
How to Use the Wa to Arpent Calculator:
- Enter the value you want to convert in the 'From' field (Wa).
- The converted value in Arpent will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Length category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Wa to Arpent: Step-by-Step Guide
Converting Wa to Arpent involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Wa = 0.034205 arpentsExample Calculation:
Convert 10 wa: 10 × 0.034205 = 0.34205 arpents
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
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View all Length conversions →What is a Wa and a Arpent?
The Wa (วา) is a traditional Thai unit of length. It is legally defined in relation to the metric system as exactly 2 meters.
The Wa serves as a fundamental unit within the traditional Thai system of measurement, particularly for land area. It is roughly equivalent to the distance between a person's outstretched fingertips when their arms are extended horizontally to the sides (similar to a fathom).
The Arpent is a historical French unit used primarily for measuring land area, but also sometimes used as a unit of length. As a unit of length, the arpent typically referred to the side length of a square arpent of land.
Its precise length varied significantly by region and time period in France and its colonies. A commonly cited value, particularly associated with the arpent de Paris, is based on 180 French feet (pieds du Roi), which equates to approximately:
- 58.47 meters (m)
- 191.8 feet (ft)
Other variations existed, such as the arpent commun (based on 200 French feet, ~64.97 m) and the arpent d'ordonnance (based on 220 French feet, ~71.47 m).
Note: The Wa is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Arpent belongs to the imperial/US customary system.
History of the Wa and Arpent
The Wa has been used in Thailand (formerly Siam) for centuries, likely originating from anthropomorphic measurements like the arm span. It was a practical unit for everyday measurements, construction, and land surveying.
- Traditional System: The Wa was part of a system that included smaller units like the khuep (span, ~25 cm), sok (cubit, ~50 cm, 1 Wa = 4 Sok), and larger units like the sen (rope, 1 Sen = 20 Wa).
- Standardization: During the modernization reforms under King Chulalongkorn (Rama V) in the late 19th and early 20th centuries, Thailand began standardizing its weights and measures. The Weights and Measures Act of 1923 formally defined traditional units in terms of the metric system. The Wa was officially set at exactly 2 meters.
- Metrication: While Thailand officially adopted the metric system as its primary standard, traditional units like the Wa remain legally defined and widely used, especially in specific contexts like land measurement.
The term "arpent" likely derives from the Gaulish arepennis, meaning "end of a field," suggesting its origins relate to agricultural land measurement, possibly representing the amount of land that could be plowed in a day. It became a fundamental unit for land surveying in France during the medieval period and remained in use until the adoption of the metric system following the French Revolution.
- Regional Variations: Before standardization efforts, the length (and thus area) of the arpent varied considerably across different regions of France. Key variations included:
- Arpent de Paris: Based on a perche (rod) of 18 pieds du Roi (French feet), with the linear arpent (side of the square) being 10 perches, totaling 180 pieds (~58.47 m). The area was 32,400 square pieds.
- Arpent Commun: Based on a perche of 20 pieds, linear arpent of 200 pieds (~64.97 m). Area: 40,000 square pieds.
- Arpent d'Ordonnance (or Arpent des Eaux et Forêts): Based on a perche of 22 pieds, linear arpent of 220 pieds (~71.47 m). Area: 48,400 square pieds. Used primarily for royal forests.
- Colonial Usage: The arpent was exported to French colonies, notably:
- New France (Quebec, Canada): The arpent de Paris became the standard for land grants along the St. Lawrence River, shaping the characteristic long, narrow farm plots (rangs).
- Louisiana (USA): The French arpent (usually the arpent de Paris) was used for land measurement before and sometimes after the Louisiana Purchase. Its legacy persists in land titles and some place names.
- Metrication: The metric system officially replaced the arpent and other traditional units in France in the late 18th and early 19th centuries, though its use lingered in practice and historical records.
Common Uses and Applications: wa vs arpents
Explore the typical applications for both Wa (imperial/US) and Arpent (imperial/US) to understand their common contexts.
Common Uses for wa
The Wa's most significant modern use is in land measurement, but it historically had broader applications:
- Land Area: This is the most common contemporary use. Land area in Thailand is almost exclusively measured in Tarang Wa (ตารางวา - Square Wa).
- 1 Tarang Wa = 4 square meters (2m x 2m)
- 1 Ngan (งาน) = 100 Tarang Wa (400 sq m)
- 1 Rai (ไร่) = 4 Ngan = 400 Tarang Wa (1600 sq m) Property deeds, real estate listings, and land surveys invariably use Rai, Ngan, and Tarang Wa.
- Length Measurement: While meters are now standard for most length measurements (textiles, construction materials), the Wa might still be used informally or in traditional contexts. Historically, it was used for measuring distances, building dimensions, rope lengths, etc.
- Construction & Architecture: Traditionally used for laying out building plots and determining dimensions in Thai architecture.
- Cultural Context: Understanding the Wa and its related area units is essential for navigating real estate, agriculture, and historical contexts in Thailand.
When to Use arpents
The Arpent (both linear and area) is now largely obsolete for practical measurement but remains historically significant:
- Historical Land Surveys: Essential for interpreting old maps, deeds, and land grants in France, Quebec, Louisiana, and other areas formerly under French control (e.g., parts of the US Midwest like Missouri, Illinois, Indiana).
- Legal Context: Land descriptions in some regions may still reference original measurements in arpents, requiring conversion for modern understanding.
- Historical Research: Understanding the arpent is crucial for historians studying agriculture, settlement patterns, and land tenure systems in French history and its colonial contexts.
- Unit of Area: While this page focuses on the length, the arpent is more commonly known and encountered as a unit of area (the square arpent).
Additional Unit Information
About Wa (wa)
How long is a Wa?
A Wa is defined as exactly:
- 2 meters (m)
- 200 centimeters (cm)
- Approximately 6.5617 feet (ft)
- Approximately 78.74 inches (in)
What are the related traditional Thai length units?
The Wa fits into a system, often based on factors of 2 and 10:
- Smaller Units:
- 1 Wa = 4 Sok (ศอก - cubit, ~50 cm)
- 1 Sok = 2 Khuep (คืบ - span, ~25 cm)
- 1 Khuep = 12 Nio (นิ้ว - finger breadth, ~2.08 cm, not the English inch)
- Larger Unit:
- 1 Sen (เส้น - rope/chain) = 20 Wa (40 meters)
- 1 Yot (โยชน์ - league) = 400 Sen (16 kilometers)
How is the Wa used for area measurement?
The primary unit for land area is the Tarang Wa (Square Wa):
- 1 Tarang Wa = 1 Wa × 1 Wa = 2 m × 2 m = 4 square meters Larger area units are based on the Tarang Wa:
- 1 Ngan = 100 Tarang Wa (400 m²)
- 1 Rai = 4 Ngan = 400 Tarang Wa (1600 m²)
- (For reference, 1 Acre ≈ 2.53 Rai, 1 Hectare = 6.25 Rai)
Is the Wa an SI unit?
No, the Wa is not an SI unit. It is a traditional Thai unit, although its legal definition is based on the SI unit, the meter (m).
Is the Wa still used today?
Yes, absolutely. While the metric system is the official standard for science, commerce, and industry, the Wa (especially as Tarang Wa for area) remains the standard unit for land measurement in Thailand. It is legally recognized and used in all official land documents and real estate transactions. Its use for linear measurement is less common but may still occur informally or in traditional settings.
About Arpent (arpent)
Is the Arpent a unit of length or area?
The Arpent is primarily known as a unit of area, representing a specific parcel of land. However, a linear arpent also exists, defined as the side length of a square whose area is one arpent. This page focuses on the linear arpent. The relationship is direct: Area Arpent = (Linear Arpent)². Because the linear arpent varied, the area also varied.
Where is the Arpent still relevant?
The Arpent is not used for everyday measurements today. Its relevance is almost entirely historical and legal:
- Quebec (Canada): Crucial for understanding historical land division and property lines, especially the seigneurial system.
- Louisiana (USA): Important for interpreting land titles dating back to the French colonial period.
- France: Relevant for historical studies and understanding old documents.
- Other former French territories: May appear in historical records (e.g., Mauritius, parts of the US Midwest).
How long is a linear Arpent?
There is no single value, as it varied regionally. Common historical values include:
- Arpent de Paris: ~180 French feet ≈ 58.47 meters ≈ 191.8 feet (Most common in Quebec & Louisiana)
- Arpent Commun: ~200 French feet ≈ 64.97 meters ≈ 213.2 feet
- Arpent d'Ordonnance: ~220 French feet ≈ 71.47 meters ≈ 234.5 feet (Note: The French foot, pied du Roi, was slightly longer than the English foot, approx. 32.48 cm or 12.79 inches).
How does the linear Arpent compare to a Meter or Foot?
- The most common linear arpent (~58.47 m) is significantly longer than a meter. (1 Arpent ≈ 58.47 m)
- It is also much longer than a foot. (1 Arpent ≈ 191.8 ft)
Is the Arpent an SI unit?
No, the Arpent is not an SI unit. It is a traditional unit from the French system of measurements. The SI base unit for length is the meter (m), and the SI unit for area is the square meter (m²).
Conversion Table: Wa to Arpent
| Wa (wa) | Arpent (arpent) |
|---|---|
| 0.5 | 0.017 |
| 1 | 0.034 |
| 1.5 | 0.051 |
| 2 | 0.068 |
| 5 | 0.171 |
| 10 | 0.342 |
| 25 | 0.855 |
| 50 | 1.71 |
| 100 | 3.421 |
| 250 | 8.551 |
| 500 | 17.103 |
| 1,000 | 34.205 |
People Also Ask
How do I convert Wa to Arpent?
To convert Wa to Arpent, enter the value in Wa in the calculator above. The conversion will happen automatically. Use our free online converter for instant and accurate results. You can also visit our length converter page to convert between other units in this category.
Learn more →What is the conversion factor from Wa to Arpent?
The conversion factor depends on the specific relationship between Wa and Arpent. You can find the exact conversion formula and factor on this page. Our calculator handles all calculations automatically. See the conversion table above for common values.
Can I convert Arpent back to Wa?
Yes! You can easily convert Arpent back to Wa by using the swap button (⇌) in the calculator above, or by visiting our Arpent to Wa converter page. You can also explore other length conversions on our category page.
Learn more →What are common uses for Wa and Arpent?
Wa and Arpent are both standard units used in length measurements. They are commonly used in various applications including engineering, construction, cooking, and scientific research. Browse our length converter for more conversion options.
For more length conversion questions, visit our FAQ page or explore our conversion guides.
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⚖️ Metric vs Imperial
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Verified Against Authority Standards
All conversion formulas have been verified against international standards and authoritative sources to ensure maximum accuracy and reliability.
National Institute of Standards and Technology — Official US standards for length measurements
Bureau International des Poids et Mesures — International System of Units official documentation
Last verified: February 19, 2026