Rai in other units
| m² | sq ft | acres | hectares |
|---|---|---|---|
| 1,600 | 17,222.26 | 0.395369 | 0.16 |
- = 4 ngan = 400 square wah = 40 m × 40 m
About the rai
The rai is a square sen, 40 m on a side, and has been exactly 1,600 m² since Thailand aligned its customary units with the metric system. Title deeds and land office documents give area in rai, ngan and square wah (tarang wa), often written as three numbers: 4-2-25 means 4 rai, 2 ngan and 25 square wah.
Because the rai is metric, conversions are exact: 6.25 rai make a hectare, and one acre is about 2.53 rai. Rowlett’s dictionary notes that the unit is called the hai in northern Thailand and the lai in Laos.
Related measures
- 1 rai = 4 ngan = 400 square wah
- 6.25 rai = 1 hectare
- 1 acre ≈ 2.53 rai
Quick table
| Rai | Square feet | Square meters | Acres |
|---|---|---|---|
| 1 | 17,222.26 | 1,600 | 0.395369 |
| 2 | 34,444.51 | 3,200 | 0.790737 |
| 5 | 86,111.28 | 8,000 | 1.9768 |
| 10 | 172,222.57 | 16,000 | 3.9537 |
| 20 | 344,445.13 | 32,000 | 7.9074 |
| 50 | 861,112.83 | 80,000 | 19.7684 |
| 100 | 1,722,225.67 | 160,000 | 39.5369 |
Sources
Spotted a value that’s wrong for your area, or a regional value we should add? Email support@landmeasure.app with a source.