Thailand’s official national lottery (Thai: สลากกินแบ่ง, rtgs: salak kin baeng) is administered by The Government Lottery Office (GLO). The lottery is drawn on the first and the sixteenth of every month. It is one of only two forms of legalised gambling permitted in Thailand, the other being horse racing in Bangkok.
The lottery in Thailand is hugely popular despite the low odds of winning and the unfavourable payout ratio. The payout ratio for the Thai lottery is 60%, as compared with world-wide averages of 74% for bingo, 81% for horse racing, 89% for slot machines, and 98% in blackjack (basic rules). It is the most popular legal form of gambling in Thailand.