Convert Rai to Square Mile (rai → mi²)

Converting rais to square miles 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 rais

   Start with the number of rais (rai) you want to convert.
2. 2
   Multiply by 0.000618

   The conversion factor from rai to mi² is 0.000618. Multiply your value by this number.
3. 3
   Read the result in square miles

   The result is your value in square miles (mi²).

Multiply the value in rais by 0.000618. For the reverse direction, multiply by 1,618.7426.

• ✓1 rai = 1600 m² = 0.16 ha.
• ✓1 rai = 4 ngan = 400 tarang wa.
• ✓1 hectare = 6.25 rai.

• ✗Assuming rai equals hectare — only 16%.
• ✗Mixing rai with ngan or tarang wa without conversion.
• ✗Using rai outside Thailand — not internationally recognised.

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

What is the Square Mile?

The square mile equals exactly 2.589988110336 square kilometers (or 640 acres) and is the American unit for measuring large geographic areas: counties, states, watersheds, and large parks. The continental United States covers about 3 million square miles, and Texas alone is 268,597 mi². Population density in US contexts is given in people per square mile (e.g., New York City has about 27,000 people/mi²). The square mile relates to the acre (640 acres = 1 mi²), the square kilometer (1 mi² ≈ 2.59 km²), the square foot (1 mi² = 27,878,400 ft²), and the hectare (1 mi² ≈ 259 ha). It is the natural large-area unit for American geographic discussion, though metric countries use square kilometers for the same purpose.

• US states, counties and cities
• UK geographic and historical boundaries
• Large estate and national-park reporting in Anglo contexts