Convert Hectare to Rai (ha → rai)

Converting hectares to rais is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in hectares

   Start with the number of hectares (ha) you want to convert.
2. 2
   Multiply by 6.25

   The conversion factor from ha to rai is 6.25. Multiply your value by this number.
3. 3
   Read the result in rais

   The result is your value in rais (rai).

Multiply the value in hectares by 6.25. For the reverse direction, multiply by 0.16.

• ✓1 ha = 10,000 m² = 100 m × 100 m.
• ✓1 ha ≈ 2.47 acres — quick check for US/UK comparison.
• ✓Agricultural yields quoted as tonnes/hectare are standard worldwide.

• ✗Using hectares for very small plots — m² is clearer.
• ✗Converting acres to hectares with 2.5 factor — correct is 2.47 (1.2% error).
• ✗Treating "a few hectares" as an exact figure in contracts — always specify.

What is the Hectare?

The hectare equals exactly 10,000 square meters (100 m × 100 m) and is the international standard area unit for agricultural land, forestry, and large land development. Adopted as part of the metric system in 1795, the hectare's name combines 'hect-' (one hundred) with 'are' (the basic metric land unit of 100 m²) — meaning 100 ares. A standard FIFA football pitch covers about 0.7 hectares, and Central Park in New York is approximately 341 hectares. Farms across Europe, Latin America, Africa, and Asia are sized in hectares (a small family farm might be 5–20 ha). The hectare relates to the square meter (1 ha = 10,000 m²), the square kilometer (100 ha = 1 km²), the acre (1 ha ≈ 2.471 acres), and the square mile (1 ha ≈ 0.00386 mi²). It is one of the few non-SI units accepted for use with SI for legal land measurement.

• European farm, vineyard and orchard size
• Forestry and conservation land
• Large construction projects and urban development

What is the Rai?

The rai equals exactly 1,600 square meters (40 m × 40 m) and is the traditional Thai land unit, still officially used in Thailand for real estate, agriculture, and property records. The rai is divided into 4 ngan (each 400 m²), and 1 ngan equals 100 wa (each 4 m²). Despite Thailand's adoption of the metric system, the rai remains the everyday unit for buying and selling land in Thai contexts — a small urban plot might be 1 rai, while rural farms are quoted in tens or hundreds of rai. The rai relates to the square meter (1 rai = 1,600 m²), the hectare (1 ha = 6.25 rai), and the acre (1 acre ≈ 2.529 rai). The rai's exact metric definition (1,600 m²) makes conversion to SI units precise, unlike many traditional land units.

• Thai rural property and farmland
• Thai real-estate listings
• Agricultural yield reporting in Thailand