Rai (Thai) (rai)

ThaiTraditional unit (still used in some regions)

Exactly 1,600 m² (about 0.4 acre). The standard unit of land in Thailand.

1 rai (Thai) = 1,600 square meters (exactly).

1 rai (Thai) = 1,600 square meters

About the rai (Thai)

Rai is a Thai word for a field or plantation, and it is the standard unit for farmland and rural property in Thailand. One rai is the area of a square one sen on each side, which with a sen of 40 m gives 1,600 square meters, or 16 ares.

That is roughly 0.4 acre, so a hectare holds 6.25 rai. The rai is divided into 4 ngan and 400 square wa, and official land documents record areas in these three tiers, sometimes in shorthand such as 4-2-25 for 4 rai, 2 ngan and 25 square wa.

Older land measures in the region were looser, but the cadastral survey started in 1896 fixed the units against metric lengths. The rai is therefore exact today, and it is still the unit in which Thai land is bought, sold and taxed.

Sources: Wikipedia: Rai (unit); Wikipedia: Thai units of measurement

Rai (Thai) conversion chart

1 rai (Thai) expressed in every other area unit:

Unit1 rai (Thai)
Square Meters1,600
Square Kilometers0.0016
Hectares0.16
Square Inches2,480,004.96
Square Feet17,222.25667
Square Yards1,913.584074
Acres0.3953686103
Square Miles0.0006177634537
Square Centimeters16,000,000
Square Millimeters1,600,000,000
Tsubo484
Pyeong484
Barns1.6×10³¹
Ares16
Square Rods63.25897766
Square Chains3.953686103
Roods1.581474441
Oxgangs0.02635790736
Virgates0.01317895368
Hides0.00329473842
US Survey Acres0.3953670289
Sections0.0006177609826
Townships0.00001716002729
Iugera0.634080026
Jō (tatami Mat)968
Se16.13333333
Tan1.613333333
Chō (area)0.1613333333
Mu (Chinese)2.4
Qing (Chinese)0.024
Ngan (Thai)4
Square Wa (Thai)400
Guntha15.81474441
Cents (India)39.53686103
Marlas63.25897766
Kanals3.162948883
Dunams1.6
Feddans0.380952381
Arpents0.4679881482

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