What the Vigorish Is
The vigorish, or “vig,” is the cut the house takes on every wager, the silent tax on your gamble. One sentence can sum it up: it’s the price of playing. Bookmakers slip it into the odds so you never see it outright. That tiny percentage can erode profits faster than a leaky faucet. When you bet $100 at -110, you actually risk $110 to win $100 – that extra $10 is the vig.
How Bookies Set the Juice
Look: bookmakers balance two forces—risk and profit. They start with a “fair” line, then shave a sliver off each side to protect the margin. It’s not magic; it’s math and market psychology mashed together. If the crowd leans heavy on one side, the odds shift, but the vig stays glued to the middle. This is why you’ll often see the same –110 spread across football, basketball, and tennis.
The Hidden Cost to Bettors
And here is why you should care: the vigorish compounds over time. A 2% edge sounds sweet, but a 5% vig can turn that edge into a losing streak. Think of it as a silent parasite feeding on every win before it even lands. The longer you play, the deeper the bite; short bursts of action can mask the drain.
Spotting the Vigorish in Odds
By the way, spotting the vig is easier than you think. Convert the odds to implied probability, add both sides, and you’ll see a total over 100%. The excess is the house’s cut. For example, –120 and +100 give you 52.6% + 50% = 102.6%; that 2.6% is the vig. The trick is to hunt for the smallest spread—sometimes –105 on both sides. That’s a tighter vig, a better deal.
Why It Matters for Your Bankroll
Here’s the deal: ignoring the vig is like driving with the parking brake on—your money never gets where it should. Adjust your staking plan to account for that hidden fee. If you’re aiming for a 5% ROI, you need a true edge of about 7% after the vig is sliced off. In other words, the vig inflates the threshold for profitability.
Actionable Takeaway
Next time you scan the line, calculate the implied total, subtract 100, and let that number dictate your bet size. Cut the stakes when the vig spikes above the norm, and chase lines with the thinnest margin. That’s how you keep the house from stealing your edge.