Lottery odds are calculated with one formula from school math: the number of ways to choose some numbers from a pool. Six numbers from forty nine give nearly fourteen million combinations, so the odds of the top prize are about one in fourteen million. A game drawing five from seventy, with one extra ball from a second pool of twenty five, multiplies two such counts and lands near three hundred million. Every number added to the pool raises the count steeply.
A lottery odds calculator does the counting for any pool: enter how many numbers are drawn and from how many, and it returns the odds for each tier. For multiple tickets the calculator simply adds the chances, since each ticket covers a different combination. Ten tickets in a draw of fourteen million combinations give ten chances in fourteen million; the odds improve in step with the money spent, never faster.
What is lottery odds for one person holding one ticket? The same number as for everyone else. Your chances of winning the lottery do not grow with loyalty, with a lucky shop or with years of play, because each draw starts fresh. The honest answer to what my odds are is printed in the game rules: one chance for every combination bought, against the full count of combinations the draw allows.