UnitConvConvert
rai
Areaagriculture

What is a rai?

The traditional Thai land unit — 1600 m² = 0.16 hectare

Definition

The rai equals 1600 square metres exactly — the traditional Thai land unit. It is 1/6.25 of a hectare. Still widely used in Thai property transactions and agricultural documents. A rai is subdivided into 4 "ngan" (400 m² each).

Common uses

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

🌍 Real-world scale

A small Thai farm might be 10–20 rai (1.6–3.2 ha). Thai rice yields: 400–600 kg per rai.

Convert from rais

11 conversions
Rai to Square Meter1 rai = 1,600 m²Rai to Square Kilometer1 rai = 0.0016 km²Rai to Square Centimeter1 rai = 16,000,000 cm²Rai to Square Millimeter1 rai = 1,600,000,000 mm²Rai to Hectare1 rai = 0.16 haRai to Acre1 rai = 0.3954 acRai to Square Foot1 rai = 17,222.26 ft²Rai to Square Inch1 rai = 2,480,004.96 in²Rai to Square Yard1 rai = 1,913.58 yd²Rai to Square Mile1 rai = 0.0006178 mi²Rai to Dunam1 rai = 1.6 dunam

Convert to rais

11 conversions
Square Meter to Rai1 m² = 0.000625 raiSquare Kilometer to Rai1 km² = 625 raiSquare Centimeter to Rai1 cm² = 6.2500e-8 raiSquare Millimeter to Rai1 mm² = 6.2500e-10 raiHectare to Rai1 ha = 6.25 raiAcre to Rai1 ac = 2.52929 raiSquare Foot to Rai1 ft² = 5.8064e-5 raiSquare Inch to Rai1 in² = 4.0323e-7 raiSquare Yard to Rai1 yd² = 0.0005226 raiSquare Mile to Rai1 mi² = 1,618.74 raiDunam to Rai1 dunam = 0.625 rai

Tips

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

Common mistakes

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

FAQ about the rai

What is a rai?
The rai equals 1600 square metres exactly — the traditional Thai land unit. It is 1/6.25 of a hectare. Still widely used in Thai property transactions and agricultural documents. A rai is subdivided into 4 "ngan" (400 m² each).
Where is the rai used?
The rai is commonly used for: Thai rural property and farmland; Thai real-estate listings; Agricultural yield reporting in Thailand.
What is an example of a rai in real life?
A small Thai farm might be 10–20 rai (1.6–3.2 ha). Thai rice yields: 400–600 kg per rai.
What category does the rai belong to?
The rai is a unit of area, part of the 12-unit area category on UnitConv.
How accurate are rai conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 12 area units and their conversions.🗺️ Area hub →