Which price is best when the odds are American?

Always convert to decimal first. American odds do not sort cleanly across the +/− boundary: −105 is a better price than −110 and worse than +105, and the numbers give no clue. The highest decimal is the best price, without exception.

Does this fetch live odds?

No. It compares prices you enter. There is no feed behind it, and no account or connection is required — everything happens in your browser.

What if two books show the same price?

Both are flagged as best. A tie is a real tie, and picking between them is a question about limits, promotions and how quickly the book pays, not about the number.

How much is line shopping actually worth?

Typically one to two percentage points of ROI for a bettor who shops consistently — which is comparable to a genuine handicapping edge, and considerably easier to obtain. It is the highest-return habit available to a recreational bettor.

Can I compare different lines this way?

No. Every row has to be the same selection on the same market. A −3 and a −3.5 are different bets, and the longer price on the worse number is often the worse bet.

Odds Comparison

Put every book's number on the same selection side by side and see exactly what the worse ones cost.

Stake

Best available price

-105

Taking the best number instead of the worst is worth $8.28 on this bet alone — on the same selection, for the same risk.

Best decimal: 1.952
Implied probability: 51.22%
Profit at best price: $95.24
Spread across books: $8.28
Books compared: 3

Every entered price, with profit and the cost of taking it instead of the best
Book	American	Decimal	Implied	Profit	vs best
DraftKings	-110	1.909	52.38%	$90.91	−$4.33
FanDuelBest	-105	1.952	51.22%	$95.24	—
BetMGM	-115	1.870	53.49%	$86.96	−$8.28

Every row has to be the same selection on the same market — same team, same line, same period. Comparing a −3.5 at one book with a −3 at another is comparing two different bets, and the better price is not automatically the better number.

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How it works

Sportsbooks do not price identically. They start from similar models, then move independently as money arrives, so at any moment the same selection carries a range of prices — often two or three cents wide, occasionally much more. This puts them in one table and flags the highest decimal, which for the same selection is always the better bet.

The column worth looking at is the last one: what each inferior price costs you on this stake. It is usually a small number, and that is precisely why line shopping gets skipped. Four dollars does not feel like a decision. Four dollars a bet across a season of five hundred bets is two thousand dollars, taken for nothing more than opening a second app.

Put differently: shopping is the only edge in betting that requires no opinion. Handicapping is hard and you might be wrong. Taking −105 instead of −110 on a selection you were going to bet anyway is free, certain, and available to everyone — which is why most winning bettors treat multiple accounts as equipment rather than strategy.

The implied probability column is the honest one. It is still the book’s price with its margin in it, so it is not a real probability. Use it to compare prices to each other, and use the No-Vig calculator when you want to know what the market actually thinks.

The formula

implied probability = 1 / decimal
profit              = stake × (decimal − 1)

cost of a worse price = stake × (D_best − D_taken)

best price = the highest DECIMAL, always.
American odds do not sort: +150 beats +140,
but −105 beats −110.

Same selection, same stake — so the losing outcome is identical everywhere and the entire difference lives in the winning payout.

A worked example

Three books on the same side: −115, −110 and −105. In decimal that is 1.870, 1.909 and 1.952 — so −105 is the bet.

On $100, the best price returns $95.24 profit and the worst returns $86.96. The gap is $8.28 on one wager, for identical risk on an identical selection.

Run that across 500 bets a year and the difference is over $4,000 — more than most bettors’ entire annual profit, and it required no handicapping at all. The implied probabilities tell the same story: 53.5% at −115 against 51.2% at −105, so the worse price needs you to be right two percentage points more often to break even.

Common questions

Which price is best when the odds are American?: Always convert to decimal first. American odds do not sort cleanly across the +/− boundary: −105 is a better price than −110 and worse than +105, and the numbers give no clue. The highest decimal is the best price, without exception.
Does this fetch live odds?: No. It compares prices you enter. There is no feed behind it, and no account or connection is required — everything happens in your browser.
What if two books show the same price?: Both are flagged as best. A tie is a real tie, and picking between them is a question about limits, promotions and how quickly the book pays, not about the number.
How much is line shopping actually worth?: Typically one to two percentage points of ROI for a bettor who shops consistently — which is comparable to a genuine handicapping edge, and considerably easier to obtain. It is the highest-return habit available to a recreational bettor.
Can I compare different lines this way?: No. Every row has to be the same selection on the same market. A −3 and a −3.5 are different bets, and the longer price on the worse number is often the worse bet.

The guide behind this calculator

Line Shopping: The Edge That Requires No HandicappingTaking the best available price on bets you were making anyway is the only free edge in betting. Here is what it is worth.8 min read

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For informational and analytical purposes only. These tools do not predict outcomes and do not recommend wagers.