Mega Sena

How Mega Sena Works

Players select 6 numbers from a pool of 1 to 60. Each draw uses a machine that extracts 6 main balls randomly. There are no supplementary or bonus balls in Mega Sena, unlike some other lotteries. Matching all 6 numbers wins the jackpot. Matching fewer numbers wins lower prize tiers.

Tickets cost a fixed amount per line. Multiple lines can be purchased on a single ticket. Players may also use a systemic entry to pick more than 6 numbers, which generates multiple combinations automatically and increases cost proportionally.

Draws occur on Wednesday, Saturday, and Sunday evenings. Results are published shortly after each draw by Caixa.

Prize Tiers and Odds

Mega Sena has 6 prize divisions based on matching numbers:

Match 6: Jackpot. Odds of 1 in 50,063,860. This tier carries the entire advertised prize pool unless no ticket matches all 6.

Match 5: Fixed tier. Odds of 1 in 2,332,385. Prize amount set by regulation.

Match 4: Fixed tier. Odds of 1 in 61,628. Prize amount set by regulation.

Match 3: Fixed tier. Odds of 1 in 844. Prize amount set by regulation, typically a full refund of the ticket price.

Matches of 0, 1, or 2 numbers produce no prize. The probability of winning any prize across all tiers combined is approximately 1 in 292.

When no ticket matches the jackpot, the prize rolls to the next draw. Prize pools are distributed according to Brazilian lottery law. A percentage of revenue funds federal social programs.

Odds and Expected Value

The overall chance of winning any prize in a single line is roughly 0.34 percent. This includes the Match 3 tier, which returns only the ticket price.

Expected value depends on the current jackpot size. Mega Sena operates under a pari-mutuel jackpot model: money wagered on a draw funds the jackpot pool, minus the percentage reserved for lower tiers and the operator. When the jackpot grows across multiple rollovers, each subsequent ticket has slightly better expected value, but never positive in the mathematical sense for the Match 6 tier alone.

Syndicate play reduces variance by spreading cost across multiple tickets. A 10-person syndicate playing 10 lines per draw costs each member one-tenth the price but receives one-tenth of any prize. The mathematical odds remain unchanged, but participation risk is lower.

History and Regulation

Mega Sena began operation in 1996 under Caixa Econômica Federal, a Brazilian federal bank and the sole legal operator of most lotteries in Brazil. The game is regulated by federal lottery law and overseen by the Ministry of Economy.

Caixa publishes detailed draw results and validates ticket claims through official retail channels and authorized lottery centers across Brazil and internationally in jurisdictions where Brazilian lotteries are sold.

Draw integrity is maintained through physical ball-drawing machines that are tested and certified before public use. Independent auditors supervise all draws.

Tax Treatment

In Brazil, lottery winnings are subject to federal income tax at a flat rate. The exact percentage depends on the prize amount and current federal tax rules. Caixa deducts tax at the point of payout for most prizes.

Non-residents and international players may face additional withholding or reporting obligations depending on their home country's tax treaties with Brazil. Prize winners are responsible for understanding and meeting their own tax obligations. Consult a tax professional in your jurisdiction before claiming a large prize.