A proposition (prop) bet is a wager on an outcome within a game rather than on the final result — for example a quarterback's passing yards, whether a specific player scores, or who wins the coin toss. It settles on that specific event, independent of who wins.

Do props have higher vig than normal bets?

Usually yes. Many props carry -115 to -125 pricing per side or worse, which is more margin than the standard -110 on a point spread. Softer lines can exist, but you pay for the privilege through a wider hold.

What is correlation risk in prop betting?

Correlation is when two props move together — like a QB's passing yards and his top receiver's receiving yards. Books know this, so correlated parlays are often blocked or repriced. Betting correlated legs separately can also concentrate your risk.

Prop Betting Explained: How Proposition Bets Work | SportsWhizz

What a prop bet actually is

A proposition bet — a “prop” — is a wager on something that happens inside a game rather than on the final score or winner. You are not betting on who wins; you are betting on a specific outcome, and it settles regardless of the result. A quarterback can throw for 320 yards in a loss and your “over” still cashes.

Props fall into two broad buckets. Player props are tied to an individual: passing yards, rushing yards, strikeouts, points, rebounds, receptions. Team and game props cover things like the first team to score, the total number of touchdowns, or the classic novelty market, the coin toss. If you are new to how sportsbooks price and label markets, our best betting sites roundup and operator reviews show which books offer the deepest prop menus.

Over/under structure and the juice

Most player props are framed as an over/under around a number the book sets. Take a QB passing yards line of 274.5. You can bet the over or the under, and each side is priced with its own odds — often something like -115 both ways.

That “-115” is the important part. At -110 (the standard spread price), you risk $110 to win $100. At -115 you risk $115 to win $100. The extra five points is the book’s margin — often called the vig or juice — and props tend to carry more of it than main markets. You can see exactly how much a book is holding with our margin calculator, and convert any American price to implied probability with the odds converter.

Worked example: QB passing yards O/U 274.5 at -115

Say a book posts:

Over 274.5 yards: -115
Under 274.5 yards: -115

The half-point (.5) means there is no push — the QB either clears 274.5 or he doesn’t. At -115, the implied probability of each side is about 53.5%. Add both sides together and you get roughly 107%. That extra ~7% over a “fair” 100% market is the book’s built-in hold. On a standard -110 spread the two sides sum to about 104.8%, so this prop is holding noticeably more.

If you bet $115 on the over and the QB throws for 290, you win $100 (plus your $115 stake back). If he throws for 260, you lose the $115. Nothing about who won the game matters.

Why props are often “softer” — but pricier

Here is the honest trade-off. Book traders spend the most attention on the biggest markets: sides and totals for major games. Player props, especially deep-menu and second-tier ones, get less individual attention, which is why sharp bettors say props can be softer — the line is occasionally a step behind reality after an injury or a role change.

But that softness comes wrapped in higher juice. A -110 market gives you more room to be right over time than a -125 market does. So even when a prop line looks mispriced, the extra margin eats into the edge. Books are aware of both facts, which is why many of them limit or restrict bettors who consistently beat props. Don’t assume a soft-looking number is a free lunch.

Correlation risk

Some props are linked. If a quarterback throws for a big number, his top receiver’s receiving yards usually rise too. That is correlation, and it cuts two ways. Sportsbooks block or reprice obviously correlated legs in parlays (same-game parlays adjust the odds for exactly this reason). And when you stack correlated bets yourself, you are not diversifying — you are concentrating a single bet (the QB has a big day) across multiple tickets. One quiet game can sink all of them at once.

Getting started sensibly

Props are a fun way to engage with a game, and the deep menus at the top US books make almost any moment bettable. Just go in clear-eyed:

Check the price on both sides, not just the number — a “value” over at -140 is not value.
Remember the hold is higher than on spreads; compare across books before you bet.
Watch for correlation when combining legs.
Understand that consistent prop winners often get limited.

For deeper sport-specific breakdowns, our NFL and NBA guides walk through the exact prop markets each book runs. And whatever you bet, size it as entertainment money you can afford to lose — never a system you expect to pay the bills. Set limits before you start, and lean on the tools and cooling-off features on our responsible gambling page.

Props reward curiosity and punish overconfidence. Know the structure, respect the vig, and treat the “softness” as a reason for discipline, not a shortcut to easy money.

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