Rai (Thai) to Tsubo (rai to tsubo)

1 rai (Thai) equals 484 tsubo exactly.

1 rai (Thai) = 484 tsubo

How to convert rai (Thai) to tsubo

To convert rai (Thai) to tsubo, multiply the number of rai (Thai) by 484. This factor is exact. To go the other way, multiply tsubo by 0.002066115702 (rounded).

tsubo = rai (Thai) × 484

Example: 10 rai (Thai) = 4,840 tsubo.

About these units

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.

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.

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

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

Tsubo (tsubo)

JapaneseTraditional unit (still used in some regions)

Exactly 400/121 m² (3.3058 m²), one square ken: about two tatami mats. Still the usual unit for land and property prices in Japan.

Walk into a Japanese estate agent's window and the land is still priced per tsubo. The unit is the area of a square ken, which is six shaku on a side, so 36 square shaku. Once the shaku was fixed at 10/33 metre, the tsubo followed as exactly 400/121 square metres, about 3.306.

Builders think of it as two tatami mats, since a mat is half a tsubo, and some sources also count it as 10 go. In farming contexts the same area is sometimes called a bu. A tsubo is a very small plot, so larger land is quoted in multiples such as the se, tan and cho.

The unit travelled with Japanese rule. Korea's pyeong and Taiwan's ping are the same 3.3058 square metres. South Korea formally banned the pyeong in 1961 and made commercial use an offence in 2007, yet it persists informally, much as Japan kept the tsubo after metric units became the legal standard.

1 tsubo = 3.305785124 square meters (approximately).

Sources: Wikipedia: Tsubo; Wikipedia: Japanese units of measurement; Wikipedia: Shaku (unit)

Related conversions

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