Convert Square Centimeter to Rai (cm² → rai)

Converting square centimeters 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 square centimeters

   Start with the number of square centimeters (cm²) you want to convert.
2. 2
   Multiply by 6.25 × 10^-8

   The conversion factor from cm² to rai is 6.25 × 10^-8. 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 square centimeters by 6.25 × 10^-8. For the reverse direction, multiply by 16,000,000.

• ✓1 cm² = 100 mm² = 10⁻⁴ m² = 0.155 in².
• ✓A square 1 cm on each side contains 1 cm².
• ✓For large areas switch to m² or km² early.

• ✗Reading cm² as cm in specifications — off by factor involving the length.
• ✗Confusing with cc (cubic centimetre, a volume unit).
• ✗Assuming cm² and m² are comparable by simple 100 factor — it is 10,000.

What is the Square Centimeter?

The square centimeter equals one ten-thousandth of a square meter (1/10,000 m² = 0.0001 m²) and is the everyday metric unit for small areas: cross-sections in engineering, biological specimen surfaces, fabric patterns, and skin surface area in medicine. Burn-injury severity is often described as a percentage of total body surface area, but specific lesions are measured in cm². Small mechanical components, electronic-circuit footprints, and laboratory specimens routinely use square centimeters. The square centimeter relates to the square millimeter (1 cm² = 100 mm²), the square meter (10,000 cm² = 1 m²), and the square inch (1 cm² ≈ 0.155 in²). Dressmaking patterns, photographic-print sizes, and architectural drawing details use cm² for area calculations.

• Paper and printing sizes
• Biology — leaf, skin or tissue area
• Small-item packaging specs

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