One rai is about 0.3954 acre, and one acre is about 2.529 rai. The rai is exactly 1,600 m² and the acre exactly 4,046.8564224 m², so the factor is fixed even though it is not a round number. Ten rai are about 3.95 acres and 100 rai about 39.54 acres. To go from acres to rai, multiply by about 2.529.
Formula
Rai to Acres conversion table
| Rai | Acres |
|---|---|
| 0.25 rai | 0.0988422 ac |
| 0.5 rai | 0.197684 ac |
| 1 rai | 0.395369 ac |
| 2 rai | 0.790737 ac |
| 3 rai | 1.1861 ac |
| 4 rai | 1.5815 ac |
| 5 rai | 1.9768 ac |
| 6 rai | 2.3722 ac |
| 7 rai | 2.7676 ac |
| 8 rai | 3.1629 ac |
| 9 rai | 3.5583 ac |
| 10 rai | 3.9537 ac |
| 15 rai | 5.9305 ac |
| 20 rai | 7.9074 ac |
| 25 rai | 9.8842 ac |
| 30 rai | 11.8611 ac |
| 40 rai | 15.8147 ac |
| 50 rai | 19.7684 ac |
| 60 rai | 23.7221 ac |
| 70 rai | 27.6758 ac |
| 75 rai | 29.6526 ac |
| 80 rai | 31.6295 ac |
| 90 rai | 35.5832 ac |
| 100 rai | 39.5369 ac |
| 250 rai | 98.8422 ac |
| 500 rai | 197.6843 ac |
| 1,000 rai | 395.3686 ac |
Where you’ll use it
Farmland, orchards and resort land in Thailand are measured in rai, while buyers from the United States, the United Kingdom or Australia often picture land in acres. The conversion also appears in agricultural reports that compare Thai yields per rai with yields per acre elsewhere. Because yields are quoted per unit of area, converting the area wrongly makes a yield look about 2.5 times higher or lower.
Tip: For a rough mental figure, 5 rai is a little under 2 acres (about 1.98). For anything you will sign, convert from the deed’s square meters or exact rai, ngan and square wah.