Seen on a price board, "betting odds definition" comes down to two numbers. Betting odds are a price and a forecast in one number. A short explanation covers most of it: the odds say how much a winning stake returns, and they hint at how likely the book thinks the outcome is. What does not show on the surface is the margin, which is why reading odds well means looking past the payout to the chance behind it.
A betting odds table lays these prices side by side: formats in columns, implied chance in the last one. Reading such a table is quick practice. Evens sits at a fifty per cent chance, odds of 1.50 at about sixty seven, odds of 4.00 at twenty five, and odds of 11.00 near nine. Seeing the column of chances next to the prices makes it plain how fast the chance falls as the payout gets larger.
A working definition of betting odds: the ratio between what a bet returns and what it risks, set by the book before the event. How odds work in betting follows from that. Short odds mean a likely outcome and a small return, long odds mean an unlikely one and a large return. What betting odds mean for a bettor is a trade: more potential payout always comes with less chance of collecting it, and the book's cut sits inside both sides of that trade.
To interpret betting odds, turn the price into two numbers: the payout and the implied chance. At decimal odds of 3.00 a stake of ten returns thirty, so the betting odds payout is thirty with twenty of it profit. The implied chance is one in three. If the event happens more often than that over many tries, the price is generous; if less often, the price is short. Every other reading of a price rests on those two numbers.
Odds state how much a winning stake returns and hint at how likely the book rates the outcome, with its cut hidden inside.
A match can end in a home win, a draw or an away win, and the draw takes its own share of the probability.
Multiply the stake by the price: at 3.00 a stake of ten returns thirty, twenty of which is profit.
A race has many runners, so each carries a long price, and the chances across the whole field add up well past one hundred per cent.